How to check Er40 problem?
Version 2.5 by xingzhi lin on 2026/01/20 10:07
For specific description kindly check：10 Malfunctions - Wecon
If Er40 appears after the drive is first installed or after disconnecting and reconnecting the encoder cable. Not only the Er40 need to be reset, but the absolute position of the encoder also needs to be reset. Set P10-6=1 to reset encoder, P10-3=1 to reset the error.
If Er40 appears on a drive that has been used for a long time (normally 2 to 3 years), it is very likely caused by a depleted battery. And usually, an A92(low encoder battery voltage warning) alarming appeared before Er40. If the voltage of battery is lower than 3.1V, you need to replace the battery, battery specifications are shown in the table below.
| Battery selection specification | Item | Value |
|---|---|---|
Nominal Voltage: 3.6V Nominal capacity: 2700mAh | Standard battery voltage (V) | 3.6 |
| Standard cell voltage (V) | 3.1 | |
| Battery ambient temperature range | 0 to 40 | |
| Battery storage ambient temperature range | -20 to 60 |