8 Fault Diagnosis
203
Fault Display
Fault Displays and Meanings
Fault Display Inverter
Status
Description Causes and Corrective
Actions
Digital
Operator
RUN (Green)
ALARM (Red)
Protective
Operation
Output is
turned OFF
and motor
coasts to a
stop.
OC (Overcurrent)
Inverter output current mo-
mentarily exceeded approx.
250% of rated current.
Operation is restored, if no
fault is found, after confirming
the following:
• Short circuit or grounding
at Inverter output side
• Excessive load GD
2
• Extremely rapid
Acceleration/Deceleration
Time (constants n019 to
n022)
• Special motor used
• Starting motor during
coasting
• Motor of a capacity
greater than the Inverter
rating has been started.
• Magnetic contactor
opened/closed at the
Inverter output side
• Leak current increased
because of excessively
long wiring
Note: Before turning the pow-
er ON again, make sure that
no short-circuit or ground fault
occurs at the Inverter output.
GF (Grounding)
*1 *2
Grounding current exceeded
approx. 50%
of Inverter rated output cur-
rent at the Inverter output
side.
Inverter output grounded.
⇓
Check the cause, and re-
store the operation.
Note: Before turning the
power ON again, make sure
that no short-circuit or
ground fault occurs at the In-
verter output.
SC (Load shortcircuit)
*1
Inverter output or load short-
circuited.
Inverter output shortcircuit-
ed or grounded.
⇓
Check the cause, and re-
store the operation.
* 1. Indicates that an Inverter of 5.5 kW and 7.5 kW (200 V and 400 V Classes) is attached.
* 2. The ground fault here is one which occurs in the motor wiring while the motor is running. A ground fault
may not be detected in the following cases.
• A ground fault with low resistance which occurs in motor cables or terminals.
• A ground fault occurs when the power is turned ON.
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