TERASAKI AME Series, Instruction Manual

Page: 38 / 40

KRB-5200h
-32-
Symptom Possible cause Action/remedy
There is no continuity.
1. Main contact surface is worn and
roughened.
2. Contact lead is disconnected
(due to an excessive number of
operation cycles or corrosive
gases).
3. Foreign materials are deposited
on auxiliary circuit terminal
contactor (for plug-in type ACB).

Replace ACB.

Replace ACB.

Clean auxiliary circuit terminals.
Molded case overheats.
1. Main contact surface roughens.
2. Terminal screws or stud fixing
screws loosen.
3. ACB mounting screws is
insufficiently tightened (for
plug-in type ACB).

Polish contact surface with emery
paper. If contact surface has
excessively roughened and internal
resistance exceeds its limit (see
Table 4 on page 30), replace ACB.

Retighten screws to the standard
torque.

Tighten screws securely.