KRB-5404
101
Fig. 102 Remedial actions against a symptom of "opening impossible"
Fig. 103 Remedial actions against an overheat
An overheat occurs.
Is the ambient
temperature
as specified?
Yes
Is the load current as
specified?
Yes
Are main circuit
terminal screws loose? See
No. 5 in Table 42.
No
Check main circuit
contacts. See No. 6 in
Table 42.
OK
No
No
Yes
NG
Correct/adjust
Retighten
Repair/replace
Are OCR settings
correct?
Yes
Check the control circuit.
See No. 11 in Table 42.
OK
Check the tripping
operation. See No. 27
in Table 43.
OK
Check
contacts. See Nos.
9 - 10 in Table 42 and
No. 7 in Table
43.
OK
Is the problem
solved?
No
Contact Terasaki.
No
NG
NG
NG
Yes
Correct/adjust
Repair
Contact Terasaki.
Repair/replace
End
The ACB cannot be opened.
Is manual opening
Possible?
Yes
Check the
operation voltage and SHT
voltage.
OK
Check
the control circuit
and terminals. See Nos.
5 and 11 in Table
42.
OK
No
NG
NG
Contact Terasaki.
Supply correct voltage.
Repair
Check SHT, MHT
and UVT. See Nos. 1 - 5,
14 - 23 in Table 43.
OK
Is electrical opening
possible?
No
Contact Terasaki.
NG
Yes
Repair/replace
End
