Wecon VM Series - Communication Protocol; Communication Protocol Overview; Communication Address Mapping

WECON VM AC Drive User Manual V2.0
WECON technology Co., Ltd
- 30 -
Code
Description
Possible Causes
Solutions
properly set
Load is too large or motor is stuck
Reduce load and check motor
and mechanical condition
ERR12
Input phase loss
Abnormal three-phase input
power
Check and troubleshoot
existing problems in
peripheral circuits
Failure of drive board or control
board
Seek for technical support
ERR13
Output phase loss
Motor failure
Check if the motor winding is
open
The wirings between controller
and motor is abnormal
Troubleshoot peripherals
When the motor is running, the
three-phase output of the
controller is unbalanced
Check whether the
three-phase windings of the
motor are normal and
troubleshoot
Failure of IGBT or drive board
Seek for technical support
ERR14
IGBT overheat
Ambient temperature is too high
Lower ambient temperature
Air duct blocked
Clear air duct
Fan failure
Replace the fan
Failure of thermistor or IGBT
Seek for technical support
ERR15
External alarm
input
Input external fault signal
through DI terminal
Clear external fault signal
ERR18
Current detection
failure
Abnormal current detection
circuit
Seek for technical support
Control board failure
Seek for technical support
ERR21
Parameter R/W
failure
Control board failure
Seek for technical support
ERR22
EEPROM failure
EEPROM chip failure
Seek for technical support
Table 5-3 Main Error Codes and Solutions
6 Communication Protocol
VM Series AC Drive provides RS485 communication interface and supports Modbus communication
protocol. Users can achieve centralized control by computer or PLC, set AC Drive operation
commands, modify or read function code parameters, read the working state and fault info of the
AC Drive.
5.1 Communication Address Description
The communication address listed in the function code table is in the way of writing to RAM, and
the data will not be saved after the VFD is powered off. During communication, for the write
command "06H", if the parameters need to be stored in power-down, the way of writing to
EEPROM should be used, and the original The "0" of the highest bit of the RAM address is changed
to "F", and converted into the corresponding EEPROM address, such as: "0XXX" to "FXXX", address
conversion example:
The upper limit frequency is F012, the communication address for writing RAM is: 000C, and the
address corresponding to EEPROM is: F00C.