When Two Or More Inverters Are Connected - Mitsubishi Electric FR-A8NC Instruction Manual

9.2

When two or more inverters are connected

The following system configuration shows how the cause of a fault can be checked with the LED status of the inverter
communication option (FR-A8NC) and countermeasures for the fault.
(In this example, assume SW, M/S, and PRM LEDs of the master module are OFF (master module is in normal operation).)
Power
supply
LED status
Inverters (FR-A8NC)
Master
unit
Station 1 Station 2
RUN  RUN
L.RUN  L.RUN 
SD  SD
TIME 
RD RD

LINE 
L.ERR  L.ERR 
or
RUN  RUN
TIME 
L.RUN  L.RUN 
LINE 
SD  SD
RD  RD
L.ERR  L.ERR 
: On, : Off, : Flicker, : Any of on, flicker or off
Master
CPU
Station 1
module
FR-A8NC
Station 3
 RUN 
L.RUN 
 SD  Normal
RD
 
L.ERR 
 RUN 
L.RUN 
Contact faults of the FR-A8NC with the station
 SD 
1 inverter
 RD 
L.ERR 
Station 2
FR-A8NC
Cause
HOW TO CHECK FOR ERROR USING THE LEDS
Station 3
FR-A8NC
Corrective action

Plug the FR-A8NC securely.
Check the connector.
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