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Alarm Display
Digital
RUN (Green)
Operator
ALARM (Red)
or
Flashing
Flashing
Flashing
Flashing
Inverter
Status
CE (MEMOBUS) com-
Detected as
an alarm
munications fault
only. Fault
contact out-
put is not ac-
tivated.
FBL (PID feedback loss
detection)
PID feedback value dropped
below the detection level
(n137). When PID feedback
loss is detected, the Inverter
operates according to the
n136 setting.
Option card communica-
tions fault.
•
Communication fault has
occurred in a mode
where the communica-
tions option card was
used and a Run Com-
mand or frequency refer-
ence was input from the
PLC.
•
Communication fault has
occurred in a mode
where a Run Command
and frequency reference
are set from the commu-
nication option card.
OH3 (Inverter overheat
alarm)
The Inverter overheat alarm
(OH3) was input from a multi-
function input terminal (S1
and S7).
Description
Check the following:
•
•
•
•
•
Check the mechanical sys-
tem and correct the cause, or
increase the value of n137.
Check the following:
•
•
•
•
•
•
8 Fault Diagnosis
Causes and
Corrective Actions
Communication devices
or communication sig-
nals.
PLC is not faulty.
Transmission cable is
connected properly.
Any loose terminal
screws do not result in
improper contact.
Wiring is made properly.
Communications devices
or communications sig-
nals.
PLC is not faulty.
Transmission cable is
connected properly.
Any loose terminal
screws do not result in
improper contact.
Wiring is made properly.
Communication option
card is inserted correctly.
•
Clear the multi-function
input terminal's Inverter
overheat alert input.
•
Check that the wiring is
made properly.
•
Check that a signal is not
input from the PLC.
195
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