Causes And Corrective Actions - YASKAWA VS-606V7 Series Instruction Manual

Fault Display
Digital RUN (Green)
Operator ALARM (Red)
OC
OV
UV1
138
Fault Display and Contents
Inverter
Explanation
Status
OC (Overcurrent)
Inverter output current
momentarily exceeds
approx. 250% of rated
current.
OV (Main circuit over-
voltage)
Protective
Main circuit DC voltage
Operation
exceeds the overvoltage
Output is
detection level because
shut OFF
of excessive regenerative
and motor
energy from the motor.
coasts to
Detection level:
a 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
(constants 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
• Insufficient decel time
(constants n020 and n022)
• Lowering of minus load
(elevator, etc.)
• Increase decel time.
• Connect optional
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.