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.