Instruction Book
Effective: May 2016
Page 49
IB131017EN
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Table 6.1 inspection and maintenance procedures
No./Section
Inspection Item
Criteria
Inspection Method
Corrective Action
1. Insulation
Insulation
Integrity
Drive Insulator
And
Molded pole unit support
Main Circuit to Ground
Between Main Circuit
Terminals
Control Circuit to Ground
No dirt
No cracking
Withstand
Withstand
Withstand
Visual Check
Visual Check
Hipot Tester
Hipot Tester
Hipot Tester
Clean with lint-free cloth
Replace cracked piece
Clean and retest or replace
Clean and retest or replace
Clean and retest or replace
2. Power
Elements
Vacuum Interrupters
Contact erosion
Visibility of Marks
Contact wipe visible
Adequate vacuum
Dirt on ceramic body
Visual:
Close the breaker
And look for the mark on
Moving stem from the
Rear of the breaker
(See figures
6-1
&
6-2
)
Visual:
Close the breaker and
Look for indicator (see
Figures
6-2
,
6-3
,
6-4
)
See section 6-5.
Visual Check
If a mark is not visible,
Replace pole unit assembly.
Replace pole unit assembly
If the indicator is visible.
Replace pole unit assembly.
Clean with dry lint-free cloth.
3. Control
Circuit
Closing and Tripping Device
Wiring
Terminals
Motor
Tightness of Hardware
Smooth and correct
operation by control
power
Securely tied in
proper place
Tight
If required
No loose or missing
parts
Test closing and tripping of the
circuit breaker twice
Visual Check
Visual Check
Functional Test
Visual and tighten with
Appropriate tools
Replace any defective device.
Identify per trouble-shooting
Chart in this section.
Repair or tie as necessary
Tighten or replace if necessary
Replace as necessary.
Tighten or reinstate if
Necessary.
4. Operating
Mechanism
Dust or Foreign Matter
Lubrication
Deformation or Excessive
Wear
Manual Operation
No dust or foreign
matter
Smooth operation
and no excessive
wear
No excessive
deformation or wear
Smooth operation
Visual Check
Sight and feel
Visual and operational
Manual charging, closing and
tripping
Clean as necessary
Refer to Figure 6-5,6-6
And paragraph 6-10.
Remove cause and replace parts
Correct per troubleshooting chart
(Table
6.4
) if necessary.