Bracket
7-42
4st 25/30 2022
16) Inspection of PT Motor
1. Measure the length of the brush.
Replace the motor assy if the specified value or less.
Brush Wear Limit a:
6 mm ( 0.236 in)
2. Check the electrical conductivity of the brush and circuit
breaker.
Replace the motor assy if there is no electrical conductivity.
b
•
Do not pull the PT motor lead wires out of
the brush holder.
•
Do not press the bimetal b with a strong
force as this will affect the operation of
the circuit breaker.
Commutator Diameter Limit c:
18.5 mm (0.728 in)
3. Measure the diameter of the commutator.
Replace the motor assy if the specified value or less.
c
4. Check the conductivity of the armature.
Replace the motor assy if outside the specified value.
d
e
f
Conductivity of Armature
Commutator Section Conductivity
Commutator Section dï
No conductivity
Armature Core Section e
Commutator Section dï
No conductivity
Armature Shaft Section f
5. Check the brush holder for cracks or damage, and replace
the motor assy if necessary.
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