GE PVDB-28kV Instructions Manual page 16

.Section 6. Measurements and Adjustments
Sequence of operation of dual trip coils is determined by
the customer.
Dimension G: The gaps must be between the 0.00 inch
maximum at the center pole and 0.54 inch minimum at
the outer poles. It is not necessary that all readings
correspond. A properly adjusted breaker will have more
gap and wipe on the center pole than on the outside
poles.
Close Coil
With the closing spring discharged, operate the plunger
in the same manner described above for the trip coil.
Make certain that the pltmger moves freely over its nul
stroke in the coil, see Figllre 15.
The close coil and trip coil plunger dimensional checks
are made in the operating mechanism which is
accessible from the bottom. To accommodate these
checks, the breaker should be lllrned on its right side
resting on two-by-four wood blocks. DO NOT use the
portable breaker lift trIlck.
6-5 Control Coil Plunger Travel
Trip Coil
With the breaker in the open position and the closing
spring in the charged position, make certain that the
trip linkage and trip shaft move freely over the full
plunger travel, (Fig. 12).
Control Switches
There are three switch locations on the ML-18H
mechanism (See Figllre 14). The CL/MS closing latch
monitoring switch (13), is to the rear of the ratchet
wheel and is operated from the closing latch. The
SM/LS spring motor limit switches (11) control the
spring charging motor and the anti-pump relay. The 52
charge switch, which is in the same location can be used
for remote indication of the charged condition of the
spring. The L/C latch checking switch (12), monitors
the position of the trip latch.
The switches are adjusted as described in Table 2 Items
8 and 9.
Some breakers due to the customers application are
equipped with two trip coils (optional), (Fig. 12).
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Figure 10. Gap Measurement
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