Exception Response - Delta Electronics AC Motor Drive VFD-EL User Manual

Chapter 4 Parameters|
Content
Note: 2116H is number display of Pr.00.04. High byte of 2117H is number of decimal places
of 2116H. Low byte of 2117H is ASCII code of alphabet display of Pr.00.04.

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:
Address Low
Address High
Function Low
Function High
4-96
Address
2104H Output current (AXX.X)
2105H Reserved
2106H Display analog signal of PID feedback input terminal
2107H Reserved
2108H DC-BUS Voltage (UXXX.X)
2109H Output voltage (EXXX.X)
210AH
Display temperature of IGBT (°C)
2116H User defined (Low word)
2117H User defined (High word)
ASCII mode:
STX ':'
'0'
'1'
'8'
'6'
Function
RTU mode:
Address
Function
Exception code
CRC CHK Low
CRC CHK High
Revision August 2008, 2ELE, V1.02
01H
86H
02H
C3H
A1H