Instruction manual

174
* To display or clear the fault history, refer to page 50.
Stops ac-
cording to
constant.
STP (Emergency stop)
The Inverter stopped accord-
ing to constant n005 after re-
ceiving the emergency stop
fault signal.
Check the following:
• NO/NC contact selec-
tion (constant).
• Wiring is made properly.
• Signal is not input from
the PLC.
FBL (PID feedback loss
detection)
PID feedback value dropped
below the detection level.
When PID feedback loss is
detected, the Inverter oper-
ates according to the n136
setting.
Check the mechanical sys-
tem and correct the cause,
or increase the value of
n137.
Option card communica-
tions fault
A communication error oc-
curred in the mode where the
communication option card
was used and a run com-
mand or frequency reference
was input from the PLC.
Check the following:
• Communications
devices or communica-
tions signals.
• PLC is not faulty.
• Transmission cable is
connected properly.
• Wiring is made properly.
• Any loose terminal
screws do not result in
improper contact.
• Communication option
card is not inserted cor-
rectly.
Protective
Operation
Output is
turned OFF
and motor
coasts to a
stop.
• Insufficient power
supply voltage
• Control power sup-
ply fault
• Hardware fault
Check the following:
• Power supply voltage
• Main circuit power sup-
ply connections
• Terminal screws: Loose?
• Control sequence.
• Replace the Inverter.
Fault Display Inverter
Status
Description Causes and Corrective
Actions
Digital
Operator
RUN (Green)
ALARM (Red)
or
(OFF)