Main circuit wiring

Main circuit terminals

Table 4-1 The name and function of VD2A servo drive main circuit terminal

VD2B servo drive (220V) main circuit terminal distribution

Table 4-2 The name and function of VD2B servo drive (220V) main circuit terminal

VD2B servo drive (380V) main circuit terminal distribution

Table 4-3 The name and function of VD2B servo drive (380V) main circuit terminal

Table 4-4 The name and function of VD2C servo drive (380V) main circuit terminal

VD2F servo drive main circuit terminal distribution

Table 4-5 The name and function of VD2F servo drive main circuit terminal

Table 4-6 The name and function of VD2L servo drive (380V) main circuit terminal 

Power wiring

Use single-phase 220V power supply model: VD2-010SA1G and VD2-014SA1G

Use single-phase 220V power supply model: VD2-016SA1G and VD2-019SA1G

Use three-phase 220V power supply model: VD2-021SA1G, VD2-025SA1G and VD2-030SA1G

Use single-phase 220V power supply model: VD2F-010SA1P、VD2F-014SA1P

Use three-phase 380V power supply model: VD2-021TA1G

Precautions

1. Do not connect the input power cord to the output terminals U, V, W, otherwise the servo drive will be damaged. When using the built-in braking resistor, C and D must be connected (factory default connection).
2. When the cables are bundled and used in pipes, etc., due to the deterioration of heat dissipation conditions, please consider the allowable current reduction rate.
3. When the temperature in the cabinet is higher than the cable temperature limit, please choose a cable with a larger cable temperature limit, and it is recommended that the cable wire use Teflon wire. Please pay attention to the warmth of the cable in the low temperature environment. Generally, the surface of the cable is easy to harden and break under the low temperature environment.
4. The bending radius of the cable should be more than 10 times the outer diameter of the cable itself to prevent the core of the cable from breaking due to long-term bending.

Power line connection

Power line

Wecon VD2 series servo drives have 3 kinds of interface power cables: rectangular plug, aviation plug and in-line type.

Connector exterior	Terminal pin distribution	Pin description	Motor flange
		Rectangular plug Pin number Signal name Color 1 U Red 2 V White 3 W Black 4 PE Yellow-green	40 60 80
		Aviation plug Pin number Signal name Color 2 U Black 4 V Yellow-green 3 W Black 1 PE Black	110 130
		In-line type plug Pin number Signal name Color 3 U Red 1 V White 2 W Black 4 PE Yellow-green	60 80

Table 4-7 Power cable servo motor side connector

Brake device cable

Connector exterior		terminal pin distribution	Motor flange
WD series		Pin number Signal name 1 BR+ 2 BR-	40 60 80
WE series		Pin number Signal name 1 DC 24V 2 GND 3 -	80 110 130

Encoder cable connection

Connector exterior	Terminal pin distribution	Pin description
		Pin number Signal name Pin number Signal name 1 5V 4 - 2 GND 5 SD+ 3 - 6 SD-

Table 4-6 Encoder cable servo drive side connector

Table 4-7 Absolute value encoder line connector (Rectangular plug)

Table 4-8 Connection of encoder line pin

The pin with “*” indicates the signal line of encoder battery. If the multi-turn battery memory function is not used, you don’t need to connect the signal lines. It is only used as single turn encoder line at this time.

Connector shape and terminal pin distribution		Motor flange
		110 130
Pin number Signal name 7 5V 5 GND 6 SD+ 4 SD- 1 Shield 3 Battery+ 2 Battery-

Table 4-9 Absolute value encoder line connector (Aviation plug)

Table 4-10 Absolute encoder cable connector (aviation socket)

The pin with “*” indicates the signal line of encoder battery. If the multi-turn battery memory function is not used, you don’t need to connect the signal lines. It is only used as single turn encoder line at this time.

Table 4-11 Absolute encoder cable connector (in-line type)

Table 4-12 Connection of encoder line pin

The pin with “*” indicates the signal line of encoder battery. If the multi-turn battery memory function is not used, you don’t need to connect the signal lines. It is only used as single turn encoder line at this time.

Servo drive control input and output wiring

CN2 pin distribution

VD2A and VD2B servo drive control input and output pin distribution (CN2 interface)

Table 4-13 CN2 interface definition of VD2A and VD2B servo drive

VD2-0xxSA1H drive control input and output pin distribution (CN2 interface)

Table 4-14 CN2 interface definition of VD2-0xxSA1H servo drive

VD2F servo drive control input and output pin distribution (CN2 interface)

Table 4-15 CN2 interface definition of VD2F servo drive

Wiring diagram

VD2A and VD2B servo drive

VD2-0xxSA1H servo drive

✎Note: Please refer to "Table 4-14 CN2 interface definition of VD2-0xxSA1H servo drive" for the pin numbers in the figure. 

VD2F servo drive

Position instruction input signal

Table 4-16 Position instruction signal description

The instruction pulse and sign output circuit on the host device side can be selected from differential output or open collector output. The maximum input frequency is shown in the table.

Differential input

The connection of differential input is shown in Figure 4-9

Open collector input

• Open collector input connection

• NPN and PNP wiring

Analog input signal

The analog input signal is only supported by VD2A and VD2B servo drives.

Table 4-17 Analog input signal description

Digital input&output signals

VD2A and VD2B servo drives

Table 4-18 DI/DO signal description

Digital input circuit

• When the control device (HMI/PLC) is relay output

• When the control device (HMI/PLC) is open collector output

Digital output circuit

• When the control device (HMI/PLC) is relay input

• When the control device (HMI/PLC) is optocoupler input

VD2-0xxSA1H servo drives

Table 4-19 DI/DO signal description

Digital output circuit

• When the control device(HMI/PLC) is relay input

• When the control device (HMI/PLC) is optocoupler input

The digital output circuit wiring of VD2-0xxSA1H Servo Drive is different from that of VD2A and VD2F servo drives. VD2-0xxSA1H needs to be connected to external 24V DC power supply. (CN2_35 pin and CN2_37 pin are connected to COM0 and 24V+ of external 24V power supply respectively). If the access current is too large and the DOCOM line is relatively thin, servo drives need to access multiple DOCOM to achieve the shunt effect.

VD2F servo drive

Table 4-20 DI/DO signal description

Digital input circuit

• When the control device (HMI/PLC) is relay output

• When the control device (HMI/PLC) is open collector output

Digital output circuit

• When the control device (HMI/PLC) is relay input

• When the control device (HMI/PLC) is optocoupler input

Brake wiring

The brake is a mechanism that prevents the servo motor shaft from moving when the servo drive is in a non-running state, so that the motor remains in position lock so that the moving part of the machinery will not move due to self-weight or external force.

The brake input signal is no polar. You need to use 24V power. The standard wiring between brake signal BK and brake power is as below.

Communication signal wiring

Wecon VD2 series servo drive supports two communication modes: RS-422 and RS-485. The communication port is RJ45 socket. The exterior of communication terminal is shown in Figure 4-31

The communication modes supported by the driver communication ports are in the following table.

Table 4-21 Communication port communication modes

Communication connection with servo host computer (RS422)

Servo drives communicate with the host computer via RS422 communication. A USB to RS422 (RJ45 connector) cable is required for communication, and you need to equip it by yourselves.

• VD2A&VD2B

VD2A and VD2B servo drives communicate with the host computer via the CN3 interface by RS422 communication. Figure 4-36 and Figure 4-37 show the communication connections.

Table 4-22 VD2A and VD2B pin definitions for CN3

• VD2F

VD2F servo drive communicates with the host computer via the CN3 or CN4 interface byRS422 communication. The communication diagrams of VD2F servo drive and host computer are shown in Figure 4-38.

CN3&CN4	Pin	Name	Function description
	1	RX-	Computer sends negative terminal (drive receives negative)
	2	RX+	Computer sends positive terminal (drive receives positive)
	3	TX-	Computer receives negative terminal (drive sends negative)
	4	GND	Ground terminal
	5	NC	Not used
	6	TX+	Computer receives positive terminal (drive sends positive)
	7	NC	Not used
	8	NC	Not used

Table 4-23 VD2F pin definitions for CN3/CN4 interfaces

Communication connection with PLC and other device (RS485)

VD2A and VD2B servo drives communicate with PLC and other devices for Modbus via CN5 or CN6 interface (located on the top of servo drive) by RS485 communication.

CN5&CN6	Pin	Name	Function description
	1	485-	Computer sends negative terminal (drive receives negative)
	2	485+	Computer sends positive terminal (drive receives positive)
	3	NC	Not used
	4	GND	Ground terminal
	5	GND	Ground terminal
	6	NC	Not used
	7	Reserved	Reserved
	8	GND	Ground terminal

Table 4-24 VD2A and VD2B pin definition of CN5/CN6 interface

VD2F servo drives communicate with PLC and other devices for Modbus via CN3 or CN4 interface (located on the top of servo drive) by RS485 communication.

CN3&CN4	Pin	Name	Function description
	1	485-	Computer sends negative terminal (drive receives negative)
	2	485+	Computer sends positive terminal (drive receives positive)
	3	-	Computer receives negative terminal
	4	GND	Ground terminal
	5	-	Not used
	6	-	Computer receives positive terminal
	7	-	Not used
	8	-	Not used

Table 4-25 VD2F pin definition of CN3/CN4 interfaces