LX3V-4PG - Wecon

= **1 Introduction** =

The LX3V-4PG is pulse generator unit which has four channels. Each channel can control positioning of an axis independently. It works by sending specified quantity of pulses (200 kHz maximum) to Server controller or step motors.

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The LX3V-4PG is an extension module of LX3V series PLC, which transfers data with the PLC using the FROM/TO instructions.

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There are two versions for LX3V-4PG, one is LX3V-4PGA (Advanced), and the other is LX3V-4PGB (Basic). Please get more detail from [BFM description]

**Warnings:**

Make sure power is Cut off before installation/disassembly of the unit or connection of wires onto the unit, to prevent electric shock or product damage.

= **2 Dimensions** =

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[[image:LX3V-4PG_html_bf6ccc4678f6c050.png||class="img-thumbnail" height="426" width="1100"]]

Figure 2‑1

①Extension cable and connector

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②Com LED: Light when communicating

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③Power LED: Light when connect to 24V

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④State LED: Light when normal condition

⑤Module name

⑥Analog signal output terminal

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⑦Extension module interface

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⑧DIN rail mounting slot

⑨DIN rail hook

⑩Mounting holes (φ4.5)

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= **3 Crimp terminations** =

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(((

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* Please use crimp terminals as indicated on the graph.

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* The tightening torque should be applied 5 to 8 Kg.cm.

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* Other terminals should be empty but only wiring terminals mention in this manual.

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[[image:LX3V-4PG_html_a035e325e1e93843.png||class="img-thumbnail" height="195" width="400"]]

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= **4 Terminals Definition** =

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|FP0|Channel 1 outputs pulses|RP2|Channel 3 outputs direction

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|RP0|Channel 1 outputs direction|FP3|Channel 4 outputs pulses|DOG 3|Home position return: Channel 4 near point signal input

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|COM1|Common terminal for channel 2|RP3|Channel 4 outputs direction|X 0|Channel 1 interrupt signal input

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|FP1|Channel 2 outputs pulses|DOG 0|Home position return: Channel 1 near point signal input|X 1|Channel 2 interrupt signal input

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|RP1|Channel 2 outputs direction|DOG 1|Home position return: Channel 2 near point signal input|X 2|Channel 3 interrupt signal input

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|COM 2|Common terminal for channel 3 and 4|DOG 2|Home position return: Channel 3 near point signal input|X 3|Channel 4 interrupt signal input

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= **5 Input and output Specification** =

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**Input specification**

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|(% colspan="4" %)**LX3V-4PG input specification**

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|(% colspan="4" %)(((

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X input and DOG input

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Input terminal: X0-X3, DOG0-DOG3

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This is NPN type, if you want to PNP type, please connect S/S to 24V negative electrode, and X connects to positive electrode.

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[[image:LX3V-4PG_html_3b5702fca4add783.gif||class="img-thumbnail" height="352" width="250"]]

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|Input signal voltage|DC V 24 ±10%|Input signal type|Contact input, NPN and PNP

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|Input signal current|5 mA /DC24V|Circuit insulation|Optocouples insulation

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|Input ON current|3.5 mA / DC24 V|Input action|LED turns on, when input ON

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|Input OFF current|Less than 1.5 mA| |

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== **5.1 Output specification** ==

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|(% colspan="3" %)**Output circuit**

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|(% colspan="3" %)(((

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**Output:**

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FP0-3: High-speed pulse output;

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Electrical parameters: Same as PLC high speed output (Y0-Y1);

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PR0-3: Normal output direction;

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Electrical parameters: Same as PLC normal output ( from Y4);

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[[image:LX3V-4PG_html_9e4a6cda17d864b3.gif||class="img-thumbnail" height="194" width="400"]]

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|(% colspan="2" %)**Items**|**Transistor output**

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|(% colspan="2" %)Models|LX3V series PLC

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|(% colspan="2" %)External power supply|DC 5~~30V

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|(% colspan="2" %)Circuit insulation|Optocouplers insulation

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|(% colspan="2" %)Action|LED turns on when optocoupler works.

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|(% rowspan="3" %)(((

Maximum

load

)))|Resistance|0.5A/ each point, 0.8A/ four points (0.3A/each point in FP terminal)

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|Inductance|12W/DC24V (7.2W/DC24V in FP terminal)

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|Lamp|0.9W/DC24V (0.9W/DC24V in FP terminal)

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|(% colspan="2" %)Leakage current|0.1mA/DC30V

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|(% colspan="2" %)Minimum load|DC5V2mA

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|(% rowspan="2" %)Response time|Input current (ON)|5us less than 0.2ms (FP terminal)

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|Input current (OFF)|5us less than 0.2ms (FP terminal)

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|(% colspan="2" %)Output type|NPN signal

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= **6 Function description** =

**BFM list**

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|(% colspan="2" %)**CH1**|(% colspan="2" %)**CH2**|(% colspan="2" %)**CH3**|(% colspan="2" %)**CH4**

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|**H16**|**L16**|**H16**|**L16**|**H16**|**L16**|**H16**|**L16**

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|2|1|42|41|82|81|122|121|X|R/W|Feed rate|(% colspan="6" %)Unit: it set by b2-b0 of BFM#3 [1]|1000|1-999,999

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|5|4|45|44|85|84|125|124|X|R/W|Maximum speed)|(% colspan="6" %)The unit value depends on the system of units set in the BFM #3 b1 and b0|100KHz|10Hz-200,000Hz

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|8|7|48|47|88|87|128|127|X|R/W|JOG speed|(% colspan="6" %)The unit value depends on the system of units set in the BFM #3 b1 and b0|10KHz|10Hz-100,000Hz

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|10|9|50|49|90|89|130|129|X|R/W|Home position return speed (high speed|(% colspan="6" %)The unit value depends on the system of units set in the BFM #3 b1 and b0|50KHz|1Hz-100,000Hz

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|14|13|54|53|94|93|134|133|O|R/W|Home position|(% colspan="6" %)The unit value depends on the system of units set in the BFM #3 b1 and b0|0|-999,999-999,999

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|18|17|58|57|98|97|138|137|X|R/W|Set position (I)|(% colspan="6" %)The unit value depends on the system of units set in the BFM #3 b1 and b0|0|-999,999-999,999

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|20|19|60|59|100|99|140|139|X|R/W|Operating speed (I)|(% colspan="6" %)The unit value depends on the system of units set in the BFM #3 b1 and b0|10Hz|10Hz-200,000Hz

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|22|21|62|61|102|101|142|141|X|R/W|Set position (II)|(% colspan="6" %)The unit value is depending on the system of units set in the BFM #3 b1 and b0|0|-999,999-999,999

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|24|23|64|63|104|103|144|143|X|R/W|Operating speed (II)|(% colspan="6" %)The unit value is depending on the system of units set in the BFM #3 b1 and b0|10Hz|10Hz-200,000Hz

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|27|26|67|66|107|106|147|146|O|R/W|Current position|(% colspan="6" %)The unit value is depending on the system of units set in the BFM #3 b1 and b0| |

LX3V-4PGB: 5110;

LX3V-4PGA: 5120; [5]

)))|K5110|

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|**CH2**|(% style="width:411px" %)43|(% style="width:274px" %)65|(% style="width:268px" %)68

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|**CH3**|(% style="width:411px" %)83|(% style="width:274px" %)105|(% style="width:268px" %)108

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|**CH4**|(% style="width:411px" %)123|(% style="width:274px" %)145|(% style="width:268px" %)148

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|(% colspan="2" %)**Device name**|(% style="width:411px" %)Parameters|(% style="width:274px" %)Operating mode|(% style="width:268px" %)Flags

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|(% colspan="2" %)**b9**|(% style="width:411px" %)Rotation direction|(% style="width:274px" %)(((

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Interrupt

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single speed positioning start[3]

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)))|(% style="width:268px" %)CLR signal

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|(% colspan="2" %)**b8**|(% style="width:411px" %)~-~-|(% style="width:274px" %)Single speed positioning start|(% style="width:268px" %)Positioning completed flag

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|(% colspan="2" %)**b7**|(% style="width:411px" %)~-~-|(% style="width:274px" %)Relative /absolute position|(% style="width:268px" %)Error flag

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|(% colspan="2" %)**b6**|(% style="width:411px" %)Interrupt signal input polarity[3]|(% style="width:274px" %)(((

Home position

return start

)))|(% style="width:268px" %)Current position value overflow

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|(% colspan="2" %)**b5**|(% rowspan="2" style="width:411px" %)Positioning data multiple 10^^0^^~~10^^3^^|(% style="width:274px" %)JOG- operation|(% style="width:268px" %)~-~-

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|(% colspan="2" %)**b4**|(% style="width:274px" %)JOG+ operation|(% style="width:268px" %)DOG signal

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|(% colspan="2" %)**b3**|(% rowspan="2" style="width:411px" %) |(% style="width:274px" %)Forward pulse stop|(% style="width:268px" %)Stop signal

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|(% colspan="2" %)**b2**|(% style="width:274px" %)Reverse pulse stop|(% style="width:268px" %)Home position return completed

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|(% colspan="2" %)**b1**|(% rowspan="2" style="width:411px" %)System units: motor systems, mechanical systems, combined systems.|(% style="width:274px" %)STOP|(% style="width:268px" %)Reverse rotation/ Forward rotation

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|(% colspan="2" %)**b0**|(% style="width:274px" %)Error reset|(% style="width:268px" %)Ready/Busy

**✎Note: **

Symbol remarks: O means power-off save type; X means power-off non-save type; R means read only; W means read and write.

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1. Unit is um/R, mdeg/R or 10-4 inch/R.

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1. Unit is PLS, um/R, mdeg/R or 10-4 inch depending on the system of units set in the BFM #3 b1 and b0.

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1. S-type acceleration and deceleration interrupt single speed positioning and two-speed positioning are available in advanced version.

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1. When there are more than one bits set on in BFM #25 b6~~b4, b12~~b8, the operation will not be executed.

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1. “5110” (basic): it has JOG, single speed positioning, home position return and speed change; “5120” (advanced): it has all functions.

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= **7 BFM instruction** =

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**System of Units and Parameter Setting**

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* **[BFM #0] Pulse rate**

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This is the count of input pulses what the motor needs to rotate 1 revolution. It is not the count of encoder pulses that generates by motor when it rotates 1 revolution. (The pulse speed is different value according with the electronic gear ratio.) The BFM #0 is not required to be set when the motor system of units is selected.

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* **[BFMs #2 and #1] Feed rate**

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b1 (distance specification) = 1 to 999,999 um/R

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b2 (angle specification) = 1 to 999,999 mdeg/R

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b3 (distance specification) = 1 to 999,999x10-4 inch/R

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This is the machine feeding distance while the motor rotates by 1 revolution. One of B1, B2 and B3 could be selected, the unit could be um/R, mdeg/R and 10-4 inch/R. The BFMs #2 and #1 are not required to be set when the motor system of units is selected.

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* **[BFM #3] Parameters (b0 to b15)**

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* System of units (b1, b0)

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|**b1**|**b0**|**System of units**|**Remarks**

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|0|0|Motor system|Units based on pulses

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|0|1|Machine system|Units based on lengths and angles

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|1|0|(% rowspan="2" %)Combined system|(% rowspan="2" %)Units based on lengths and angles for position units based on HZ for speed

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|1|1

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The table below shows the units for position and speed in accordance with the setting of the BFMs #2 and #1

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(% class="table-bordered" %)

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|(% rowspan="3" %)Position data*1|Unit 1|PLS|(% colspan="2" %)um

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|Unit 2|PLS|(% colspan="2" %)mdeg

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|Unit 3|PLS|(% colspan="2" %)10^^-4^^ inch

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|(% rowspan="3" %)Speed data*2|Unit 1|(% colspan="2" %)Hz|cm / min

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|Unit 2|(% colspan="2" %)Hz|10 deg /min

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|Unit 3|(% colspan="2" %)Hz|inch / min

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*1 position data: HP, P (I), P (II), CP.

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*2 speed data: Vmax, Vbia, Vjog, Vrt, V (I), V (II).

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* Multiplication of position data (b5, b4)

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(((

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(% class="table-bordered" %)

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|**b5**|**b6**|(((

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The position data HP, P (I), P (II) and CP will be multiplied by the value shown in the table on the left.

**Multiplication**

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|0|0|10^^0^^

|0|1|10^^1^^

|1|0|10^^2^^

|1|1|10^^3^^

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Example: When the value of the set position P(I) is 123 and the BFM #3 (b5, b4) is (1, 1), the actual position (or travel) becomes as follows:

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|Motor system units|123 * 10^^3^^=123,000 (pulses)

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|Machine system units|(% rowspan="2" %)(((

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123*10^^3^^=123,000 (um, mdeg, 10^^-4^^inch)

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~=123 (mm,deg, 10^^-1^^inch)

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|Combined system units

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* Rotation direction (b9)

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When b9 = 0: The current position (CP) value increases with a forward pulse (FP).

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When b9 = 1: The current position (CP) value decreases with a forward pulse (FP).

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This bit is used for the initialized setting. The change of rotation direction is not active when the positioning works.

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* The direction of home position return (b10)

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When b10 = 0: The current position (CP) value decreases during return to the home position.

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When b10 = 1: The current position (CP) value increases during return to the home position.

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* S-type acceleration and deceleration(b11)

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When b11=0, the acceleration is constant during the process of accelerating and decelerating for positioning, the curve of speed is trapezoidal.

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When b11=1, the curve of speed is S-type during the process of accelerating and decelerating for positioning.

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* DOG input polarity (b12)

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When b12 = 0: The DOG (near point signal) is turned on when the workpiece is approaching the home position.

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When b12 = 1: The DOG (near point signal) is turned off when the workpiece is approaching the home position.

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= **8 Speed Data and Positioning Data** =

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* **[BFMs #5 and #4] Maximum speed V,,max,,**

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Motor system and combined system: 1 to 200,000 Hz

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This is the setting of maximum speed. Make sure that the bias speed (BFM #6), the JOG speed (BFMs #7 and #8), the speed of home position return (BFMs #9 and #10), the creep speed (BFM #11), the operating speed (I) (BFMs #19 and #20) and the operating speed (II) (BFMs #23 and #24) should be equal to or less than the maximum speed. The degree of acceleration/deceleration is determined by this maximum speed, the bias speed (BFM #6), the acceleration time (BFM #15) and the deceleration time (BFM#16).

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* **[BFM #6] Bias speed V,,bia,,**

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The range is 0 to 10,000Hz

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This is the bias speed for start. When the LX3V-4PG and the stepper motor works together, it is necessary to set a value while considering the resonance area and the self-start frequency of the stepper motor

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* **[BFMs #8 and #7] JOG speed V,,JOG,,**

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The range is 1 to 100,000Hz

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This is the speed for manual forward/reverse (JOG+/JOG-). It should be between the bias speed V,,bia,, and the maximum speed V,,max,,

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* **[BFMs #10 and #9] The speed of home position return (high speed) V,,RT,,**

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The range is 10 to 100,000Hz

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This is the speed (high speed) for returning to home position. It should be between the bias speed V,,bia,, and the maximum speed V,,max,,.

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* **[BFM #11] The speed of home position return (creep) V,,CR,,**

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This is the speed (extremely slow speed) after the ear point signal (DOG) for returning to home position. It is instantaneous velocity before stopping at home position. Slower speed could get high precision of home positioning.

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* **[BFMs#14 and #13] Home position HP**

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Motor system: 0 to ±999,999 PLS. Machine system and combined system: 0 to ±999,999

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This is the position of home position return, when return actions completes, the value is written to the current position (BFMs #26 and #27).

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* **[BFM #15] Acceleration time T,,a,,**

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The range is 20 to 32,000 ms

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This is accelerating time from the bias speed (BFM #6) to the maximum speed (BFMs #5 and #4).

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* **[BFM #16] Deceleration time T,,d,,**

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The range is 20 to 32,000 ms

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This is the decelerating time between the bias speed (BFM#6) and the maximum speed (BFMs #5 and #4).

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(% style="text-align:center" %)

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[[image:LX3V-4PG_html_159c549ad122fb42.png||class="img-thumbnail" height="285" width="600"]]

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* **[BFMs#18 and #17] Set position (I) P (I)**

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Motor system: 0 to ±999,999 PLS. Machine system and combined system: 0 to ±999,999

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This is the target position or the travel distance for operation. When the absolute position is used, the rotation direction is determined in accordance with the absolute value of the set position based on the current position (BFMs #26 and #27). When the relative position is used, the rotation direction is determined by the sign of the set position.

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* **[BFMs #20 and #19] Operating speed (I) V (I)**

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The range is 10 to 100,000 Hz.

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This is the actual operating speed within the range between the bias speed V,,bia,, and the maximum speed V,,max,,. In variable speed operation and external command positioning operation, forward rotation or reverse rotation is performed in accordance with the sign (positive or negative) of this set speed.

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* **[BFMs #22 and #21] Set position (II) P (II)**

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Motor system: 0 to ±999,999 PLS. Machine system and combined system: 0 to ±999,999

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This is the set position for the second speed in two-speed positioning operation.

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* **[BFMs #24 and #23] Operating speed (II) V (II)**

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The range is 1 to 200,000Hz

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This is the second operating speed in two-speed positioning operation.

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* **[BFMs #27 and #26] Current position CP**

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Motor system: -2,147,483,648 to +2,147,483,647 Hz. Machine system and combined system: -2,147,483,648 to +2,147,483,647

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The current position data is automatically written here.

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* **Position Data, Home Position and Current Position**

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The position data includes the following: HP: Home position, P (I): Set position (I), P(II): Set position (II) and CP: Current position.

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When the operation of returning to the machine home position is completed, the home position HP (BFMs #14 and #13) value is automatically written to the current position CP (BFMs #27 and #26).

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The set positions P(I) and P(II) can be treated as absolute positions (distance from the current position CP = 0) or relative positions (travel from the current stop position) as described later.

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* **Operation Command**

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**[BFM #25] Operation command (b0 to b11, b12)**

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After data is written to the BFMs #0 to #24, write the BFM #25 (b0 to b12) as follows.

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1. When b0 = 1: The error flag (BFM #28 b7) is reset.

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1. When b1 = 0→1: Stop, if this bit is changed from 0 to 1 in positioning mode, the machine is decelerated and stopped.

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1. When b2 = 1: Forward pulse stop, the forward pulse is immediate stopped in the forward limit position.

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1. When b3 = 1: Reverse pulse stop, the reverse pulse is immediate stopped in the reverse limit position.

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1. When b4 = 1: JOG+ operation, when b4 continues to be 1 for less than 300ms, one forward pulse is generated. When b4 continues to be 1 for 300 ms or more, continuous forward pulses are generated.

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1. When b5 = 1: JOG- operation, when b5 continues to be 1 for less than 300ms, one reverse pulse is generated. When b5 continues to be 1 for 300 ms or more, continuous reverse pulses are generated.

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1. When b6 = 0→1: Home position return start, the machine starts to return to the home position, and is stopped at the machine home position when the DOG input (near point signal) is given.

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1. When b7 = 0: Absolute position. When b7 = 1: Relative position. The relative or absolute position is specified in accordance with the b7 status (1 or 0). (This bit is valid while operation is performed using b8, b9 or b10.)

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1. When b8 = 0→1: Single-speed positioning operation is performed.

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1. When b9 = 0→1: Interrupt single-speed positioning operation is performed.

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1. When b10 = 0→1: Two-speed positioning operation is performed.

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1. Reserved

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1. When b12 = 1: Variable speed operation is performed.

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**Operation command data transfer method**

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* Error can be reset by forcedly turning on/off the peripheral unit. The input X000 does not have to be used. When the data on absence/presence of error and the error code should be saved even after power interrupt, use power down save register.

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* In operation which does not require returning to the home position such as inching operation with a constant feed rate, the input X006 is not required.

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(% style="text-align:center" %)

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[[image:LX3V-4PG_html_3d648b433d213dfd.png||class="img-thumbnail" height="370" width="900"]]

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* In the program below, the start bit for the operation mode cannot be set to OFF inside the PGU, so operation from the second time and later cannot be performed. Correct it as shown in the right.

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(% style="text-align:center" %)

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[[image:LX3V-4PG_html_d88dd0506b0a57bf.png||class="img-thumbnail" height="127" width="600"]]

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= **9 Status and Error Codes** =

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* **[BFM #28] Status information (b0 to b10)**

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The status information to notify the PC of the PGU status is automatically saved in the BFM #28. Read it into the PC using the FROM instruction.

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1. When b0 = 0: BUSY. When b0 = 1: READY. This bit is set to BUSY while the PGU is generating pulses.

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1. When b1 = 0: Reverse rotation. When b1 = 1: Forward rotation. This bit is set to 1 when operation is started with forward pulse.

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1. When b2 = 0: Home position return unexecuted. When b2 = 1: Home position return completed. When returning to the home position is completed, b2 is set to 1, and continues to be 1 until the power is turned off. To reset b2, use the program.

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1. When b3 = 0: STOP input OFF. When b3 = 1: STOP input ON.

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1. When b4 = 0: DOG input OFF. When b4 = 1: DOG input ON.

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1. Reserved

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1. When b6 = 1: Current position value overflow. The 32-bit data saved in the BFMs (#27 and#26) has overflown. This bit is reset when returning to the home position is completed or the power is turned off.

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1. When b7 = 1: Error flag, b7 becomes 1 when an error has occurred in the PGU, and the contents of the error are saved in the BFM #29. This error flag is reset when the BFM #25 b0 becomes 1 or the power is turned off.

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1. When b8 = 0: Positioning started. When b8 = 1: Positioning completed b8 is cleared when positioning is started home position return start, or error reset, and set when positioning is completed. b8 is also set when returning to the home position is completed.

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1. CLR signal, when returning to the home position is completed, CLR signal is output, the duration is XXX ms.

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1. When b10=0: interrupt input OFF. When b10 = 1: interrupt input ON.

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* Various start commands are accepted exclusively while the BFM #28 b0 is set to 1 (READY).

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* Various data is also accepted exclusively while the BFM #28 b0 is set to 1 (READY). However, the BFM #25 b1 (stop command), the BFM #25 b2 (forward pulse stop) and the BFM #25 b3 (reverse pulse stop) are accepted even while the BFM #28 b0 is set to 0 (BUSY)

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(% style="text-align:center" %)

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[[image:LX3V-4PG_html_d166ba395b9da027.png||class="img-thumbnail" height="545" width="700"]]

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* **[BFM #29] Error code number**

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The following error codes Nos. are saved in the BFM#29. Read and check it when the BFM #28 b7 is set to 1 (Error present).

442

443

001: Large/small relationship is incorrect. (V max <Vbia or V RT < V CR);

444

445

002: Setting is not performed yet. (V (I), P (I), V (II) or P (II));

446

447

003: Setting range is incorrect;

448

449

00 indicates the corresponding BFM No. For example, “172" indicates that the BFMs #18 and #17 are set to 0. “043" indicates that the BFMs #5 and #4 are set to a value outside the range.

450

451

When a speed command specifies a value equivalent to or more than V max or a value equivalent to or less than Vbia, error does not occur. V max or Vbia is used for operation. Though the ready status can be specified even while an error is present, the start command is not accepted.

452

453

== **9.1 Function description** ==

454

455

Seven operation modes are available in the PG in accordance with the start command type. The data on speed and position should be transferred preliminarily from the PC to the buffer memories (BFMs) of the PG.

456

457

= **10 JOG operation** =

458

459

While the forward or reverse button is pressed and held, the motor is driven forward or in reverse.

460

461

(% style="text-align:center" %)

462

[[image:LX3V-4PG_html_ad2c03a6a25bb100.png||class="img-thumbnail" height="207" width="400"]]

463

464

Any value between the bias speed V,,bia,, (BFM #6) and the maximum speed V,,max,, (BFMs #5 and #4) is valid as the command speed V,,JOG,, (BFMs #8 and #7). When JOG signal continues to be 1 for less than 300ms, one reverse pulse is generated. When JOG signal continues to be 1 for 300 ms or more, continuous reverse pulses are generated.

465

466

**Machine home position return operation**

467

468

When the home position start command is received, the motor makes the machine return to the home position. When returning to the home position is completed, the home position HP (BFMs #14 and #13) value is written to the current position CP (BFMs #27 and #26).

469

470

(% style="text-align:center" %)

471

[[image:LX3V-4PG_html_877fe39646739cde.png||class="img-thumbnail" height="183" width="400"]]

472

473

* When the home position return start command is changed from OFF to ON, the home position return operation is started at the speed V RT (BFMs #10 and #9).

474

* When the near point signal DOG input is turned on, the motor decelerates to the creep speed V CR (BFM #11).

475

* When the near point signal DOG input is changed from ON to OFF, the motor is immediately stopped in the position 4).

476

477

For the details, refer to “DOG Switch” and “Home Position Return Operation”

478

479

= **11 DOG Switch** =

480

481

DOG switch for returning to home position

482

483

(% style="text-align:center" %)

484

[[image:LX3V-4PG_html_1462d6ed9d95fa59.png||class="img-thumbnail" height="229" width="400"]]

485

486

* A dog whose length is L is fixed to a table driven in the left and right direction by a servo motor via a ball thread.

487

* When the table moves in the home position return direction, the dog is in contact with the limit switch (LSD) for near point detection, and the LSD is actuated.

488

* The LSD is turned ON from OFF when the BFM #3 b12 is set to 0, and turned OFF from ON when the BFM #3 b12 is set to 1.

489

* The home position return direction is determined by the BFM #3 b9 (rotation direction) and b10 (home position return direction).

490

* The limit switch LSD is often referred to as dog switch. The actuation point of the dog switch is rather dispersed.

491

492

1. **Home Position Return Operation**

493

494

The home position return operation varies depending on the start position.

495

496

(% style="text-align:center" %)

497

[[image:LX3V-4PG_html_b7f046f5cdca216.png||class="img-thumbnail" height="188" width="400"]]

498

499

1. The near point signal is turned off (before the DOG passes).

500

1. The near point signal is turned on.

501

1. The near point signal is turned off (after the DOG has passed).

502

503

For this operation, the limit switches for detecting the forward limit and the reverse limit should be provided on the PC.

504

505

When the limit switch for limit detection is actuated, the home position return operation is not performed even if the home position return operation is started. Move the dog by performing the JOG operation so that the limit switch for limit detection is not actuated, then start the home position returns operation.

506

507

1. The example above shows the case where the BFM #3 b12 is set to 0 (DOG input polarity OFF→ON).

508

1. When the limit switch for limit detection is turned on, the pulse output is immediately stopped (BFM #25 b3: ON). At this time, the clear signal is also output.

509

510

[[image:LX3V-4PG_html_12fc794d28fc726.png||class="img-thumbnail"]] **When the stepper motor is used**

511

512

When the stepper motor is used, rigid attention should be paid to the following items.

513

514

1. If the motor capacity is not sufficient compared with the load torque, the motor may stall. In such a case, even if the specified quantity of pulses are supplied the motor, the expected drive quantity may not be obtained.

515

1. Start and stop the motor slowly enough (by setting a long acceleration/deceleration time to the BFM #15) so that the acceleration/ deceleration torque does not become excessive.

516

1. A resonance point is present in low speed operation. It is recommended to avoid this point. Set the bias speed (BFM #6), and do not perform operation at a speed slower than that.

517

1. An external power supply may be required for signal communication with the drive amplifier

518

519

**Single-Speed Positioning Operation**

520

521

When the start command is given, the motor accelerates up to the operating speed V (I) (BFMs #20 and #19), then decelerates and stops in the set position P(I) (BFMs #18 and #17).

522

523

(% style="text-align:center" %)

524

[[image:LX3V-4PG_html_a7a6fd6ba9fc4199.png||class="img-thumbnail" height="184" width="400"]]

525

526

**Interrupt Single-Speed Positioning Operation**

527

528

(% style="text-align:center" %)

529

[[image:LX3V-4PG_html_4dc171ea85e1220f.png||class="img-thumbnail" height="228" width="400"]]

530

531

When the start command is received, the motor starts operation. When the INTERRUPT input is received, the motor moves by the specified distance, then stops (The relative travel exclusively can be specified.) The current value is cleared by the start command. The current value starts to change by the INTERRUPT input, and becomes equivalent to the set position when the operation is completed.

532

533

**Two-Speed Positioning Operation**

534

535

(% style="text-align:center" %)

536

[[image:LX3V-4PG_html_b77df89d18c43372.png||class="img-thumbnail" height="202" width="400"]]

537

538

The motor performs the following operation by the two-speed positioning operation command. Approach at high speed as well as processing and moving forward at low speed can be performed. When the start command is received, the motor performs positioning at the operating speed V(I) (BFMs #20 and #19) until the set position P(I) (BFMs #18 and #17), then at the operating speed V(II) (BFMs #24 and #23) until the set position P(II) (BFMs #22 and #21) (two-step speed).

539

540

**Variable Speed Operation**

541

542

* When the operation command BFM #25 b12 is set to 1, the speed pulses specified in the BFMs (#20 and #19) are generated.

543

* This operating speed can be freely changed even while pulses are generated. However, acceleration and deceleration must be controlled by the PC.

544

* Only b0 (error reset) and b12 (variable speed operation) of the operation command BFM #29 are valid in this mode.

545

546

When b12 is set to 1, variable speed operation is performed.

547

548

When b12 is set to 0, pulse output is stopped.

549

550

(% style="text-align:center" %)

551

[[image:LX3V-4PG_html_735a15a6a93c266d.png||class="img-thumbnail" height="208" width="400"]]

552

553

* The pulse output does not stop even if “0” is written in BFM #21, #20

554

* As for the parameter BFM #3, only b1 and b0 (system of units) and b8 (pulse output format) are valid.

555

* The rotation direction (forward or reverse) can be specified by the sign (positive or negative) of the speed command (BFMs #20 and #19)

556

557

The procedure of changing the direction of the rotation

558

559

1. Turn OFF b12 of BFM #25.

560

1. Change the value at drive speed (BFM #20, BFM #19).

561

1. Again, turn ON b12 of BFM #25.

562

563

= **12 Common Matter for Operation Modes** =

564

565

* **Handling the stop command**

566

567

In all operation modes, the stop command is valid at any time during operation. However, if a stop command is received during a positioning operation, the motor decelerates and stops. And after restarting, the motor doesn't travel by the remaining distance, but the next positioning operation.

568

569

* **About multiple commands**

570

571

When the bits which determine operation modes such as b4, b5 and b8, b10 are turned on simultaneously in the operation command BFM #25, any operation is not executed. If other mode input is turned on while operation is being performed in any mode, such an input is neglected.

572

573

* **When travel time is small**

574

575

When the travel time is small compared to the acceleration/deceleration time (Ta), the motor cannot realize specified speed.

576

577

* Single-speed positioning operation

578

579

(% style="text-align:center" %)

580

[[image:LX3V-4PG_html_cfc4732b4e37fa45.png||class="img-thumbnail" height="225" width="400"]]

581

582

* Interrupt single operation

583

584

(% style="text-align:center" %)

585

[[image:LX3V-4PG_html_76edbb4c65fd3cd3.png||class="img-thumbnail" height="212" width="400"]]

586

587

* Two-speed positioning operation

588

589

(% style="text-align:center" %)

590

[[image:LX3V-4PG_html_2beb6801972ccbe1.png||class="img-thumbnail" height="187" width="600"]]

591

592

* **Connection of DOG and X Inputs and Handling of Limit Switches for Limit Detection**

593

594

Various limit switch inputs are connected to the DOG input and the X input in accordance with the operation mode.

595

596

The polarity of these limit switch inputs is inverted by the state of the BFM #3 b12 and b6.

597

598

To assure safety, provide limit switches for detecting the forward and reverse limits on the servo amplifier also.

599

600

Make sure so that the limit switches on the PLC are actuated simultaneously with or a little earlier than the limit switches on the servo amplifier.

601

602

Because a drive amplifier for a stepper motor does not have these terminals, make sure to provide limit switches on the PLC.

603

604

Evade from the state of the pulse output stop by Jog in the opposite direction when forward pulse stop or reverse pulse stop is turned on.

605

606

(% style="text-align:center" %)

607

[[image:LX3V-4PG_html_f795aac75a3e73ac.png||class="img-thumbnail" height="219" width="400"]]

= **13 Example** =

The reciprocation by single-speed positioning

612

613

Do not put the load on the motor for safety when you confirm the operation according to this program example.

614

615

1. The position of the motor moves to the machine home position according to the home position return start instruction now. (Machine home position return operation) At this time, the machine home position address is assumed to be “0”.

616

1. While the forward or reverse button is pressed and held, the motor is driven forward or in reverse. (Jog operation)

617

1. The value of the motor advances 10000 mm according to the automatic drive start instruction.

618

1. After wards, Y000 is turned on for two seconds as a stand by display stopping and at this time. Finally, the value of the motor retreats by 10000 mm. (Single-speed positioning operation)

619

620

(% class="table-bordered" %)

621

|(% colspan="2" %)**Input**|**Output**|4PG terminals

622

|X000: error reset|X005:JOG- operation|(% rowspan="5" %)Y000: display|DOG: input return signal

623

|X001: stop command|X006: start home return|FP: Pulse output to servo amplifier PP

624

|X002: stop forward pulse|(% rowspan="3" %)X007: Single-speed positioning operation|RP: pulse output direction

625

|X003: stop reverse pulse|(% rowspan="2" %)

626

|X004: JOG+ operation

627

628

(% style="text-align:center" %)

629

[[image:LX3V-4PG_html_d551759788b9cd25.png||class="img-thumbnail" height="1376" width="1400"]]

630

631

= **14 Diagnostic** =

632

633

Preliminary Checks and Error Indication

634

635

**To ensure correct operation**

636

637

1. Make sure that the PG I/O wiring and the extension cable connections are correct.Indicate clearly the special block No. on the panel face by adhering the labels offered as accessories.

638

1. In any positioning operation, the specified data should be written preliminarily to the BFMs #0 to #24, and then the BFM #25 should give an appropriate command. Otherwise, the PG does not function.

**Error indication**

* LED indication

The PG panel has the following LEDs:

645

646

Power indication: The POWER LED is lighted when 5 V power is supplied from the PLC.