Instruction manual

133
Protective
Operation
Output is shut
OFF and motor
coasts to a
stop.
OC (Over current)
Inverter output current
momentarily exceeds approx.
250% of rated current.
• Short circuit or
grounding at inverter
output side.
• Excessive load WK
2
• Extremely rapid
accel/decel time
(parameters n019 to
n022)
• Special motor used
• Starting motor during
coasting
• Motor of a capacity
greater than the
inverter rating has
been started.
• Magnetic contactor
open/closed at the
inverter output side.
(Load Short-circuit)*
The Inverter output or load
was short circuited.
A short-circuit or
ground fault.
⇓
Reset the fault
correcting its cause.
(Ground Fault)*
The ground fault current at the
Inverter output exceeded
approximately 50% of the
Inverter rated output current.
A ground fault occurred
at the Inverter output.
⇓
Reset the fault after
correcting its cause.
OV (Main circuit over voltage)
Main circuit DC voltage
exceeds the overfatigue
detection level because of
excessive regenerative
energy from the motor.
Detection level:
200V: Stops at main circuit
DC voltage below
approx. 410V
400V: Stops at main circuit
DC voltage approx.
820V or more
• Insufficient decel
time (parameters
n020 and n022)
• Lowering of minus
load (elevator, etc.)
⇓
• Increase decel time.
• Connect optional
braking resistor.
UV1 (Main circuit low voltage)
Main circuit DC voltage drops
below the low voltage
detection level while the
inverter output is ON.
200V: Stops at main circuit
DC voltage below
approx. 200V (160V for
single phase)
400V: Stops at main circuit
DC voltage approx.
400V or more
• Reduction of input
power supply voltage
• Open phase of input
supply
• Occurrence of
momentary power
loss
⇓
Check the following:
• Power supply
voltage
• Main circuit power
supply wiring is
connected.
• Terminal screws are
securely tightened.
Alarm Display
Inverter
Status
Explanation
Causes and
Corrective Actions
Digital
Operator
RUN (Green)
ALARM (Red)
* Display only applies to 200/400V class,7.5/10Hp, 5.5/7.5 kW inverters.