Causes And Corrective Actions - YASKAWA VS mini J7 Series Instruction Manual

Fault Display
Digital RUN ALARM
Operator (Green) (Red)
OC
OV
UV1
Fault Display and Contents
Inverter
Explanation
Status
OC
(Overcurrent)
Inverter output current
momentarily exceeds
approx. 200% of rated
current.
(Control power supply fault)
Voltage fault of
control power supply
is detected.
GF (Ground fault)
Ground fault current at
the inverter output
exceeded inverter rated
current.
Protective
OV (Main circuit over-
Operation
voltage)
Output is
Main circuit DC voltage
shut OFF
exceeds the overvoltage
and motor
detection level because
coasts to
of excessive regenerative
a stop.
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.
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.
Causes and
Corrective Actions
• Short circuit or
grounding at inverter
output side
2
• Excessive load GD
• Extremely rapid accel/
decel time
(constants n16 to n19)
• 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
• Cycle power.
If the fault remains,
replace the inverter.
• Check that motor insulation
has not deteriorated.
• Check the connection
between inverter and motor.
• Insufficient decel time
(constants n17 and n19)
• Lowering of minus load
(elevator, etc.)
• Increase decel time.
• 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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