Goodrive3000 series medium voltage VFD MODBUS protocol
-262-
Table 8.3 Meaning of fault messages
Code
Name
Meaning
01H
Illegal
command
The command from master cannot be executed. The reason may be:
1. This command is only for new device;
2. Slave is in fault state and cannot execute it.
02H
Illegal data
address
Some of the operation addresses are invalid or not allowed to access.
Especially the combination of the register and the transmitting bytes are
invalid.
03H
Illegal value
When there are invalid data in the message framed received by slave.
Note:
This error code does not indicate the data value to write exceed the
range, but indicate the message frame is an illegal frame.
04H
Operation
failed
The parameter setting in parameter writing is invalid. For example, the function
input terminal cannot be set repeatedly.
05H
Password
error
The password written to the password check address is not same as the
password set by P07.00.
06H
Data frame
error
In the frame message sent by the upper computer, the length of the digital
frame is incorrect or the counting of CRC check bit in RTU is different from the
lower computer.
07H
Parameters
only for read
It only happens in write command
08H
Parameters
cannot be
changed
during
running
The modified parameter in the writing of the upper computer cannot be
modified during running.
09H
Password
protection
When the upper computer is writing or reading and the user password is set
without password unlocking, it will report that the system is locked.
The slave uses functional code fields and fault addresses to indicate it is a normal response or some
error occurs (named as objection response). For normal responses, the slave shows corresponding
function codes, digital address or sub-function codes as the response. For objection responses, the slave
returns a code which equals the normal code, but the first byte is logic 1.
For example: when the master sends a message to the slave, requiring it to read a group of address data
of the VFD function codes, there will be following function codes:
0 0 0 0 0 0 1 1 (Hex 03H)
For normal responses, the slave responds the same codes, while for objection responses, it will return:
1 0 0 0 0 0 1 1 (Hex 83H)
Besides the function codes modification for the objection fault, the slave will respond a byte of abnormal
code which defines the error reason. When the master receives the response for the objection, in a
typical processing, it will send the message again or modify the corresponding order.