When Two Or More Inverters Are Connected - Mitsubishi Electric 800 Series 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
RUN●
L.RUN●
SD●
TIME○
RD●
LINE○
L.ERR○
or
RUN○
TIME●
L.RUN○
LINE○
SD○
RD○
L.ERR○
98
HOW TO CHECK FOR ERROR USING THE LEDS
Master
CPU
module
Station 2 Station 3
RUN● RUN●
L.RUN● L.RUN●
SD● SD● Normal
RD● RD●
L.ERR○ L.ERR○
RUN● RUN●
L.RUN● L.RUN●
Contact faults of the FR-A8NC with the station
SD● SD●
1 inverter
RD● RD●
L.ERR○ L.ERR○
Station 1 Station 2
FR-A8NC FR-A8NC
Cause
Station 3
FR-A8NC
Corrective action
────
Plug the FR-A8NC securely.
Check the connector.