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12-7 Closing Coil Replacement
Reference Figure 35 and 36. Disconnect the clos-
ing latch actuator tension spring (item 2). Re-
move the "X" washer from the rear of the plunger
pin (item 3). Slide the pin forward, freeing the
close coil for the actuator.
Remove the four bolts securing the close coil
(item 5) to the side plate. Cut the leads to the
close coil (item 5) and remove it. Reassemble
the coil and housing with plunger. Use the four
bolts over and, connect the leads with insulated
butt connectors. Assemble the plunger pin and
install a new "X" washer. Attach the tension
spring, the collar (item 8) and washer, must be
under the actuator arm and must be on top of
item 4. Tighten to the dimenions shown.
NOTE: THE POSITIVE INTERLOCK MUST BE
CHECKED AFTER REPLACING A TRIP COIL
OR CLOSE COIL. SEE CHAPTER 11 FOR DE-
TAILS ON CHANGING THE COILS OUT.
The FInal Adjustment
To adjust the closing coil linkage with the posi-
tive interlock roller (Figure 1, Item 11), the
breaker must be closed and charged. Rotate
the positive interlock roller and before reaching
the dimension shown (1.195). The positive in-
terlock arm (Figure 36) moves the close plunger
downward, discharging the breaker. The collar
may be moved up or down to discharge the
breaker. After adjustment, tighten both screws.
See MECHANICAL ADJUSTMENTS section un-
der CLOSE COIL PLUNGER.
Nominal
Pt#0177C5050Gxxx
Control
Current
Voltage
Amps
48VDC
34
125VDC
23
250VDC
18
340VDC*
N/A
120VAC
35
240VAC
20
Courtesy of NationalSwitchgear.com
Table 3. ML-19 Control Devices and Voltages
Charge Motor
Pt#0209B7340gxxx
Windup
Current
Amps
Amps
9.3
9.6
4.9
5.4
2.4
2.5
N/A
N/A
4.9
5.2
2.5
2.5
PowerVac
Chapter 12. Repair and Replacement
12-8 Auxiliary Switch
Replacement
With the breaker open and the closing spring
discharged, remove outer "X" washer from aux-
iliary switch pin on the main drive shaft. Re-
move mounting hardware securing the auxil-
iary switch to the side sheet, slide switch and
bracket from breaker. Observe and make note
of the direction of the index mark on the end of
the shaft and the position of the operating link
in relation to the main drive shaft. Loosen set
screw and remove crank. Reference Figure 46.
Remove mounting hardware securing auxiliary
switch to the mounting bracket. Before remov-
ing any wires from switch terminals, make sure
they are properly tagged with switch terminal
numbers to assure proper placement on new
switch. Remove wires.
To install new switch, attach leads then install
switch, or install switch then attach leads de-
pending upon the type of switch and its termi-
nal accessibility. Install switch shaft in operat-
ing link with index mark aligned as noted above.
Reverse above procedure to complete installa-
tion.
Close Coil
Range
Volts
38-56
100-140
200-280
N/A
104-127
208-254
47
5kV Vertical Lift
®
Trip Coil - 5 Cycle
Pt#0209B7015Gxxx
Range
Current
Volts
Amps
22.8
28-56
6.2
70-140
5.5
140-280
4.3
280-380
cap trip*
N/A
cap trip*
N/A
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