YASKAWA LKEB Installation Manual download pdf (Page 45)

5 TROUBLESHOOTING

Only authorized personnel should be permitted to perform maintenance and

inspections or replace parts.

No. Fault Status Cause Corrective Action

Braking resistor

unit overload relay

(or thermal over-

load protector) trips

when not decelerat-

ing.

• Without braking unit

Inverter built-in main circuit dis-

charging transistor short circuited

Replace the inverter.

• With braking unit

Braking unit main circuit discharg-

ing transistor short circuited

Replace the unit.

Improper braking unit power supply

voltage selection connector setting

(Power supply voltage > power sup-

ply voltage selection position)

Set it again.

Inverter trips at

overvoltage (ov).

Insufficient braking resistor unit

capacity

Examine the braking

conditions again.

Improper wiring Check and repair.

Braking unit fault Replace the unit.

Braking resistor

unit overload relay

(or thermal protec-

tor) sometimes

trips.

Insufficient braking resistor unit

capacity

Examine the braking

conditions again.

Braking unit trips

by heat sink over-

heat.

Excessive start/stop switching fre-

quency

Examine the operat-

ing conditions again.

Excessive load inertia

Improper combination of braking

unit and braking resistor unit

Reset.

Ambient temperature 104°F (40°C) Reduce it.

Braking unit fault Replace the unit.

The fault contact of

a braking unit

instantaneously

turned ON when

the power was

turned ON.

Neither a braking resistor nor a

braking resistor unit is connected to

the braking unit.

Connect a braking

resistor or braking

resistor unit to the

braking unit.

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YASKAWA LKEB Installation Manual Page 45

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