AC-PRO Retrofit ............................................................ DS206 TO 850
Page 2
2.0 Initial Breaker Tests
Before starting the retrofit, perform a visual/mechanical
inspection and an electrical test of the breaker to determine
its condition.
Refer to the breaker manufacturer's instruction manual and
accepted test standards such as the NETA Maintenance
Specifications or PEARL reconditioning standards to verify that
the breaker is in acceptable mechanical and electrical
operating condition.
As a minimum, perform the following:
a)
Close and trip operation of the breaker.
b)
Measure contact resistance of each pole.
c)
Measure insulation resistance from pole to pole, from pole
to frame and across open contacts.
d)
Check contact compression.
e)
Check for sufficient finger cluster spring tension at the
rear stabs.
Rectify any abnormalities found. Clean and lubricate the
breaker as required.
3.0 Remove Existing Trip Unit
1)
Remove the breaker front cover by removing four (4)
screws.
2)
Disconnect the existing wiring harness at the old trip
unit and remove the wiring harness.
3)
Remove the Trip Unit and related items.
For breakers with Amptector trip units with the low
resistance actuator coil (approximately 40 Ohms or less)
the existing actuator can be reused.
For breakers with Digitrip trip units the actuator must be
replaced. See Section 8.0.
The existing CTs will be replaced in Section 7.0.
4)
Temporarily replace the breaker front cover.
Содержание AC-PRO Retrofit Kit
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