YASKAWA VS MINI J7 series, Instruction Manual

Page: 107 / 118

107
Protective
Operation
Output is shut
OFF and motor
coasts to a
stop.
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. • Short circuit or
grounding at inverter
output side.
• Excessive load GD
2
• 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.
GF (Ground fault) Ground
fault current at the inverter
output exceeded inverter
rated current. • Check the motor
insulation.
• Check that the
connection between
inverter and motor is
not damaged.
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
n20 and n22)
• Lowering of
overhauling load
(elevator, etc.)
⇓
• Increase decel time.
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 ALARM
(Green) (Red)
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