Fault Display - Omron VARISPEED V7 User Manual

Fault Display

Fault Display
Digital RUN (Green)
Operator ALARM (Red)
* 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.
Fault Displays and Meanings
Inverter
Status
OC (Overcurrent)
Protective
Operation
Inverter output current mo-
Output is
mentarily exceeded approx.
turned OFF
250% of rated current.
and motor
coasts to a
stop.
GF (Grounding)
Grounding current exceeded
approx. 50%
of Inverter rated output cur-
rent at the Inverter output
side.
SC (Load shortcircuit)
Inverter output or load short-
circuited.
Description
Operation is restored, if no
fault is found, after confirming
the following:
•
•
•
•
•
•
•
•
Note: Before turning the pow-
er ON again, make sure that
no short-circuit or ground fault
occurs at the Inverter output.
*1 *2
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.
*1
Inverter output shortcircuit-
ed or grounded.
Check the cause, and re-
store the operation.
8 Fault Diagnosis
Causes and Corrective
Actions
Short circuit or grounding
at Inverter output side
2
Excessive load GD
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
⇓
⇓
203