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42
Maintenance
01.4IB.77000B
PowlVac-ND® Vacuum Circuit Breaker
6. If the ratcheting operation has not
improved, repeat the preceding
sequence until the ratcheting
operation is smooth. This may
require several charging cycles.
7. When the eccentric is properly set
replace the escutcheon.
Be sure that the escutcheon is
reinstalled on the proper circuit breaker,
since the escutcheon contains the
nameplate with the circuit breaker’s
rating and serial number information.
The serial number of the circuit breaker
is also attached to the circuit breaker
frame near the ground connection on a
stamped metal plate. The serial number
found on the nameplate must match
the number affixed to the frame.
b. Adjustment of Primary Trip Prop
Figure 19 Primary & Secondary Trip Prop
Adjustment
a. Secondary Trip Prop (Top Edge)
b. Primary Trip Prop Roller
c. Primary Trip Prop
d. Primary Trip Prop Adjusting Screw
e. Rivet
f. Trip Bar
Sight Line
b
c
d
e
f
0.005-0.015"
a
Perform the following procedures to
adjust the primary trip prop:
1. Remove the main closing spring.
Refer to
2. Adjust the primary trip prop
adjusting screw (Figure 19, d) so
that with the fundamental linkage
in the reset position, the clearance
between the primary trip prop
roller and the secondary trip prop
is 0.005” to 0.015”. The primary trip
prop adjusting screw is accessible
through the slot in the top of the
lower insulator support channel,
using an allen socket hex key
wrench.
3. Replace the main closing spring.
c. Tripping System Adjustment
To adjust the PowlVac® Tripping System
perform the following steps:
Prior to adjustments, servicing, maintenance,
or any act requiring the operator to make
physical contact with the equipment, the
power source must be disconnected and the
equipment grounded. Failure to do so may
result in death or serious injury.
!
WARNING
1. Remove the circuit breaker front cover.
2. Loosen the secondary trip prop
adjusting screw (Figure 21, c) locking
nut several full turns.