8-8
Fault
display
Probable cause and remedyFault name and
meaning
ce Communications
time-over (CE)
Normal RS-422/485
communications were
not established within
2 s. The Inverter will
detect this error if n151
for RS-422/485
communications time
over detection selection
is set to 0, 1, or 2.
· A short-circuit, ground fault, or disconnection has
occurred on the communications line.
® Check and correct the line.
· The termination resistance setting is incorrect.
® In the case of RS-422 communications, set pin
1 of SW2 of all Inverters to ON. In the case of
RS-485 communications, set pin 1 of SW2 of
only the Inverter located at each end of the
network to ON.
· Noise influence.
® Do not wire the communications line along with
power lines in the same conduit.
® Use the twisted-pair shielded wire for the
communications line.
· Master’s program error.
® Check and correct the program so that
communications will be performed more than
once every 2-s period.
· Communications circuit damage.
® If the same error is detected as a result of a
self-diagnostic test, change the Inverter.
Emergency stop (STP)
An emergency stop
alarm is input to a
multi-function input. (A
multi-function input from
1 to 7 that was set to 19
or 21 has operated.)
· An emergency stop alarm is input.
® Remove the cause of the fault.
· The sequence is incorrect.
® Check and change the external fault input
sequence including the input timing and NO or
NC contact.
OFF Power supply error
Control power supply voltage
is insufficient.
· No power supply is provided.
® Check and correct the power supply wire and voltage.
· Terminal screws are loose.
® Check and tighten the terminal screws.
· Operator connectors are faulty.
® If only the Operator indicator is not lit, (i.e., if the RUN
and ALARM indicators are lit), check and correct the
Operator’s connectors.
· The Inverter is damaged.
® Replace the Inverter.
Maintenance Operations Chapter 8
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