Operation Selection At Communication Error Occurrence (Pr.121, Pr.122, Pr.502) - Mitsubishi Electric FR-E700EX Instruction Manual

4.18.3 Operation selection at communication error occurrence (Pr.121, Pr.122, Pr.502)

You can select the drive unit operation when a communication line error occurs during RS-485 communication from the
PU connector.
Parameter
Name
number
Number of PU
121
communication retries
PU communication
122
check time interval
Stop mode selection
502 at communication
error
The above parameters can be set when Pr.160 Extended function display selection = "0". (Refer to page 182)
(1) Retry count setting (Pr.121)
 Set the permissible number of retries at data receive error occurrence. (Refer to page 213 for data receive error for retry)
 When data receive errors occur consecutively and exceed the permissible number of retries set, a drive unit trips
(E.PUE) and a motor stops (as set in Pr.502).
 When "9999" is set, a drive unit fault is not provided even if data receive error occurs but an alarm signal (LF) is output.
For the terminal used for the LF signal output, assign the function by setting "98 (positive logic) or 198 (negative logic)" in
any of Pr.190 to Pr.192 (output terminal function selection).
Example: PU connector communication, Pr.121 = "1" (initial value)
Computer
Drive unit
Drive unit
Computer
ALM
Example: PU connector communication, Pr.121 = "9999"
Computer
Drive unit
Drive unit
Computer
LF
Communication operation and setting
Initial Setting
value range
Number of retries at data receive error occurrence If the number of
consecutive errors exceeds the permissible value, the drive unit trips
0 to 10
(depends on Pr.502).
1
Valid only Mitsubishi inverter (computer link operation) protocol
9999 If a communication error occurs, the drive unit will not come to trip.
RS-485 communication can be made. Note that a communication
0 fault (E.PUE) occurs as soon as the drive unit is switched to the
operation mode with command source.
Communication check (signal loss detection) time interval If a no-
0
0.1 to
communication state persists for longer than the permissible time,
999.8s
the drive unit trips (depends on Pr.502).
9999 No communication check (signal loss detection)
occurrence
0, 3 Coasts to stop
Decelerates to
0
1
stop
Decelerates to
2
stop
Wrong
Reception error
OFF
Wrong
Reception error
OFF
Description
At fault
Indication
E.PUE Output
After stop Output after
E.PUE stop
After stop
Without output
E.PUE
Fault (E.PUE)
Wrong
Reception error
ON
Wrong
Reception error
ON ON
At fault
Fault output
removal
Stop
(E.PUE)
Stop
(E.PUE)
Automatic
restart
functions
Normal
OFF
205
4