Mitsubishi Electric FR-A500 Instruction Manual page 245

(2) Alarm and measures
1) The inverter operates as follows at alarm occurrences
Fault Location
Inverter operation
Inverter alarm
Data communication
Inverter operation
Communication
line alarm
Data communication
Communication
option
connection fault
Option itself
Option alarm
2) Measures at alarm occurrences
Alarm Indication
E. OP3 Communication line alarm
E. 3 Option alarm
When alarms other than the above are displayed, refer to the inverter instruction manual and remove the
cause of the alarm.
(3) Inverter reset
Which resetting method is allowed or not allowed in each operation mode is described below.
Resulting Method
Inverter reset
(depend on the Pr. 75 setting)
Master
Error reset at an inverter fault
Connect terminals RES-SD
Switch off inverter power
REMARKS
1. When a communication line fault has occurred, reset cannot be made from the master.
2. The inverter is set to the external operation mode if it has been reset in the network operation mode.To resume the
network operation, the operation mode must be switched to the network operation again. (When any of "1, 2, 10, 12" is
set in Pr. 340 "link startup mode selection", this switchover is not needed.)
3. Communication stops for about 1s during an inverter reset.
Status
Inverter operation
Data communication
Inverter operation
Data communication
Alarm Definition
Network operation
Allowed
Refer to the instruction manual of each communication option.
Allowed
Allowed
Operation Mode
PU operation External operation
Inverter trip Inverter trip
Continued Continued
Continued Continued
Stop Stop
Inverter trip
Inverter trip (Depends
(Depends on the
on the Pr.502 setting)
Pr.502 setting)
Continued Continued
Continued Continued
Stop Stop
Measures
Check the LED states of the option unit and remove the
cause of the alarm. (Refer to the instruction manual of
each option unit for the LED indication status) Check the
master.
Check the connection between the inverter and option
unit for poor contact, etc. and remove the cause of the
alarm.
Operation Mode
External operation
Disallowed
Allowed
Allowed
236
OPTIONS
Network operation
Inverter trip
Continued
Inverter trip (Depends on
the Pr.502 setting)
Stop
Inverter trip (Depends on
the Pr.502 setting)
Continued
Inverter trip (Depends on
the Pr.502 setting)
Stop
PU operation
Disallowed
Allowed
Allowed