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Table 6-2. Fault Displays and Corrective Actions
Fault Display
Digital
RUN (Green)
Operator
ALARM (Red)
Blinking
Drive
Explanation
Status
FAN (Cooling fan fault)
Cooling fan is locked.
OC (Overcurrent)
Drive output current
momentarily exceeds
approx. 250% of rated
current.
OV (Main circuit over-
Protective
voltage)
Operation.
Main circuit DC voltage
Output is
exceeds the overvoltage
shut OFF
detection level because
and motor
of excessive regenerative
coasts to
energy from the motor.
a stop.
Detection level:
230V: Stops at main circuit
DC voltage below
approx. 410V
460V: Stops at main circuit
DC voltage
approx. 820V or more
UV1 (Main circuit low
voltage)
Main circuit DC voltage
drops below the low-
voltage detection level
while the drive output
is ON.
230V: Stops at main circuit
DC voltage below
approx. 200V
460V: Stops at main circuit
DC voltage
approx. 400V or more
6-4
Causes and
Corrective Actions
Check the following:
• Cooling fan
• Cooling fan wiring is not
connected.
• Short circuit
at drive
output side
• Excessive load inertia
• Extremely rapid accel/
decel time
(parameters n019 to n022)
• Special motor used
• Starting motor during
coasting
• Motor of a capacity
greater than the drive
rating has been started.
• Magnetic contactor
open/closed at the
drive output side
• Insufficient decel time
parameters n020 and n022)
• Lowering of minus load
(elevator, etc.)
• Increase decel time.
• Connect optional dynamic
braking resistor.
• Reduction of input
power supply voltage
• Open phase of input supply
• Occurrence of momen-
tary power loss
Check the following:
• Power supply voltage
• Main circuit power
supply wiring is
connected.
• Terminal screws are
securely tightened.
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