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47
Maintenance
IB-60201
b. Adjustment of Primary Trip Prop
Figure 25 Primary Trip Prop Adjustment
b
c
d
e
f
0.005-0.015"
a
a. Secondary Trip Prop
b. Primary Trip Prop Roller
c. Primary Trip Prop
d. Primary Trip Prop Adjusting Screw
e. Rivet
f. Trip Bar
Perform the following procedures to
adjust the primary trip prop:
1. Remove the main closing spring.
Refer to
Ch 5 Maintenance,
B. M
echAnISM
A
reA
,
3) Closing Spring
Removal
2. Adjust the primary trip prop
adjusting screw (Figure 25, 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
from the rear of the stored energy
mechanism and is located inside
the hole beside the lower middle
insulator supporting the live part
assembly.
3. Replace the main closing spring.
c. Tripping System Adjustment
Prior to performing any adjustment or
maintenance procedure, all high voltage
components shall be deenergized,
disconnected by means of a visible break, and
securely grounded.
WARNING
WARNING
!
To adjust the PowlVac® STD Tripping System
perform the following steps:
1. Prior to performing this adjustment
procedure, all high voltage components
shall be deenergized, disconnected by
means of visible break and securely
grounded, and ensure that the control
circuits are deenergized.
2. Remove the circuit breaker front cover.
3. Loosen the secondary trip prop
adjusting screw locking nut several full
turns (Figure 27, d).
CAUTION
CAUTION
!
Do NOT allow the secondary trip prop
adjusting screw to turn while loosening the
locking nut. Failure to observe this caution
will severely damage the mechanism.
4. Manually charge the circuit breaker
main spring.
5. Manually CLOSE the circuit breaker.
6. Slowly turn the secondary trip prop
adjusting screw (Figure 27, c)
clockwise in 1/8 turn (45˚) increments
until the breaker trips OPEN. Carefully
note the rotational position of the tool
used to turn the adjusting screw at the
moment the breaker operates. Do NOT
turn the screw any further clockwise
after the breaker operates.
