Chapter 5 Parameters
VFD-E Series
5-96 Revision August 2006, 01EE, SW--PW V1.03/CTL V2.03
Content Address Function
2108H DC-BUS Voltage (UXXX.X)
2109H Output voltage (EXXX.X)
210AH
Display temperature of IGBT (¡C)
3.6 Exception response:
The AC motor drive is expected to return a normal response after receiving command
messages from the master device. The following depicts the conditions when no normal
response is replied to the master device.
The AC motor drive does not receive the messages due to a communication error; thus,
the AC motor drive has no response. The master device will eventually process a
timeout condition.
The AC motor drive receives the messages without a communication error, but cannot
handle them. An exception response will be returned to the master device and an error
message “CExx” will be displayed on the keypad of AC motor drive. The xx of “CExx” is
a decimal code equal to the exception code that is described below.
In the exception response, the most significant bit of the original command code is set to
1, and an exception code which explains the condition that caused the exception is
returned.
Example of an exception response of command code 06H and exception code 02H:
ASCII mode: RTU mode:
STX ‘:’ Address 01H
‘0’ Function 86H Address Low
Address High
‘1’ Exception code 02H
‘8’ CRC CHK Low C3H Function Low
Function High
‘6’ CRC CHK High A1H
‘0’
Exception code
‘2’
‘7’ LRC CHK Low
LRC CHK High
‘7’
CR END 1
END 0
LF
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