Powell PowlVac IB-65020A CDR 27kV, Руководство пользователя

Страница: 47 / 68

Powered by Safety
®
40
PowlVac® CDR 27kV &38kV Vacuum Circuit Breaker
IB-65020A
Maintenance
4. Continue to operate the charging
handle until the crank arms point
downward. The circuit breaker will
now be closed and there will be a gap
between the operating pushrod lock
nuts and the pivot blocks.
5. Return the circuit breaker to the open
position by depressing the manual trip
operator.
6. To install the main closing spring
assembly reverse the preceding removal
procedure.
5) Mechanism Adjustments
When any maintenance procedure requires
the opening or closing of the circuit breaker
or the charging of any of the stored energy
mechanism springs, exercise extreme caution
to make sure that all personnel, tools, and
other miscellaneous objects are kept well clear
of the moving parts or the charged springs.
Failure to do this may cause serious damage
or injury to the circuit breaker or personnel.
WARNING WARNING
!
Several factory adjustments in the stored
energy mechanism are described in this
section. NO ADJUSTMENT OF THESE
SETTINGS IS REQUIRED FOR ROUTINE
MAINTENANCE , but they may need to be
adjusted after a major overhaul or removal
of the mechanism.
CAUTION CAUTION
!
Do not adjust these setting unnecessarily as
damage to the circuit breaker may result.
a. Adjustment of Ratchet Wheel Holding
Pawl
The holding pawl support arm
(Figure 7, d) is adjusted by the holding
pawl adjusting eccentric (Figure7, f).
If the pawl is not properly adjusted,
there will be a “knocking” noise when
the ratchet mechanism is operating or
the stored energy mechanism will not
ratchet at all.
To adjust the pawl perform the
following steps:
1. Remove the escutcheon to gain
access to the head of the bolt
holding the adjusting eccentric.
2. Loosen the bolt slightly.
3. Grip the eccentric with a pair of
slip-joint pliers or a similar tool and
rotate the stop slightly.
4. Tighten the holding bolt with the
eccentric in the new position.
5. While charging the main closing
springs, using the charging motor
to drive the mechanism, observe
the ratcheting operation for
improvement.
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