BYD PMW20 - Page 77

Handling Method:
1) Check whether there is short circuit or low impedance pull-down output between A1/
A2/A8 and B2 of electromagnetic brake drive.
2) The driver circuit of controller logic card failure, replace the controller. Operation
method of replacing the controller is the same as the Error ID 02A00.
46.Error : KEY OFF SHORTED
KEY OFF SHORTED MDI ALARM: 02A76
Cause A
The input voltage of the key switch is pulled down by external load.
M1:
It is likely that the voltage is too low. It is recommended to check the following items.
1) The input voltage of the key switch is pulled down by external load, such as DC
converter, coil, or contactor switch action.
2) Check whether the battery power line is connected correctly, whether there is loose
or virtual connection.
3) Check whether the terminals of the controller and the contactor are connected
firmly.
4) The controller is damaged.
47. Error ID: 02A02
Error Description: COIL SHOR. MC-EB, Master contactor or Electromagnetic brake coil
Cause A
1) The drive circuit of the master contactor or the electromagnetic brake coil cannot
drive the load.
2) The drive circuit of the master contactor or the electromagnetic brake coil is short-
circuited or there is persistent currents greater than 6A through the coil.
Handling Method:
1) Check whether there is a short circuit or low impedance pulling down the output
between the electromagnetic brake driver B1 and B5.
2) The drive circuit of the controller logic card failure, replace the controller. Operation
method of replacing the controller is the same as the Error ID 02A00.
PMW20
153
PMW20
152
Contactor
44. Error ID: 02A75
Error Description: CONTACTOR DRIVER
Cause A
When the electric lock is closed down, microcontroller will detect whether a short circuit
appears in the driver of the master contactor. If any, it will alarm.
Handling Method:
Check whether the two wires of the master contactor coil, B6, and the wire of the
steering controller, A4, are short-circuited or not connected to the contactor coil. If the
outer part is normal, replace the controller.
Operation method of replacing the controller is the same as the Error ID 02A00.
45. Error ID: 02A75
Error Description:CONT. DRV. EV
Cause A
1) The drive circuit of the controller coils (A1/A2/A8) cannot drive the load.
2) The coils (A1/A2/A8) are short-circuited or there are persistent currents greater than
6A through the coils.
SM-PMW202020001-EN
SM-PMW202020001-EN
Operation method of replacing the controller is the same as the Error ID 02A00.