YASKAWA VS MINI J7 Manuel d'utilisateur télécharger pdf (Page 91)

Fault Display and Contents

91

Fault Display

Digital

Operator

RUN ALARM

(Green)

(Red)

Inverter

Status

Explanation

Causes and

Corrective Actions

OC

OV

UV1

Protective

Operation

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.

Output is

shut OFF

and motor

coasts to

a stop.

• Short circuit or

grounding at inverter

output side

• Excessive load GD

2

• 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.

OV (Main circuit over-

voltage)

Main circuit DC voltage

exceeds the overvoltage

detection level because

of excessive regenerative

energy from the motor.

• Insufficient decel time

(constants n17 and n19)

• Lowering of minus load

(elevator, etc.)

• Increase decel time.

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.

• 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.

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.

• Check that motor insulation

has not deteriorated.

• Check the connection

between inverter and motor.

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