YASKAWA VS MINI J7 Series Instruction Manual page 107

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Alarm Display
Digital RUN ALARM
(Green) (Red)
Operator
Inverter
Explanation
Status
OC (Over current)
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.
OV (Main circuit over voltage)
Protective
Main circuit DC voltage
Operation
exceeds the overfatigue
detection level because of
Output is shut
excessive regenerative
OFF and motor
energy from the motor.
coasts to a
Detection level:
stop.
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
(parameters n19 to
n22)
• 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.
• Check the motor
insulation.
• Check that the
connection between
inverter and motor is
not damaged.
• Insufficient decel
time (parameters
n20 and n22)
• Lowering of
overhauling load
(elevator, etc.)
⇓
• Increase decel time.
• 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.
107