21
Instruction Book
IB02707112E
August 2015
50/75VCPW-VSR
Breaker To Vacuum Starter Replacement Unit
EATON CORPORATION www.eaton.com
simultaneously, (DO NOT MOVE THE INSULATOR ON THE MIDDLE
PHASE) while rocking the main shaft open and closed.
5. Tighten locknuts securing threaded rod to top of each insulator.
Use bottle wrench to insure standoff insulator does not rotate during
this operation.
6. Perform test as described in section 6 on Vacuum Integrity Check
before returning contactor to service.
6.2 CNil Rtplactmtno
1. Remove the coil leads from terminals 5 and 6 on the control
board. Cut the wire-tie securing the coil leads to the baseplate.
2. Remove the coil mounting angle by removing the two angle
mounting bolts located on the bottom of the contactor baseplate.
(Figure 6.7). Be careful not to allow the angle to move abruptly as
the bolts are removed since there is pressure applied to the angle by
the return spring. Remove coil assembly from contactor.
3. Remove the locknut holding the return spring bolt on the back of
the mounting angle (Figure 6.8). Note: After removing locknut, count
the threads protruding through the mounting angle to insure correct
length during reassembly.
4. Unscrew the spring assembly by hand and remove from the angle
(Figure 6.9).
5. Slip the two coils from the cores.
6. Install the two new coils over the cores. (Figure 6.10)
7. Thread the return spring assembly into the mounting angle until
the locknut under the bottom spring retainer just contacts the angle.
The number of threads protruding through the mounting angle
should be the same as counted in step 3 above. Do not overtighten
since this would compress the return spring and prevent the proper
force from being applied to the operating plate on opening. The rear
locknut for the return bolt should then be tightened on the back of
the angle.
8. Secure the angle to the contactor baseplate using the two
mounting bolts. Sufficient force must be applied to the angle to
compress the return spring and allow the threaded holes in the
angle to align with the appropriate holes in the baseplate.
9. Connect the coil leads to the appropriate terminals on the
control board. Secure the leads using a wire tie and the hole in the
baseplate to insure that the leads do not become abraised. Before
the contactor is reinstalled, verify proper operation using test power.
When power is applied, the contactor should close cleanly. When
power is removed, the moving armature should securely contact the
stop assembly.
6.3 CNnorNl BNard Chtck and Rtplactmtno
To verify the output of the control board, apply rated control voltage
to terminals one and two.
WARNING
VERIFY THAT THE APPLIED POWER CANNOT BE FED BACK INTO ANY CPT
OR OTHER CIRCUIT, WHICH MAY GENERATE DANGEROUS VOLTAGES.
Using a standard hand-held multimeter, check the dc output of the
board at terminals 5 and 6. The voltage should be approximately 9 to
16 volts. If there is no output, the board must be replaced. If there is
an output voltage, but it is not within this range, remove the board
and verify the dip switch settings.
To remove the board, wires connected to terminals 1, 2, 5, and 6
must be disconnected. Make certain that the wires are properly
marked before disconnecting to insure the ability to reconnect them
to the proper terminal. After the wires are disconnected, loosen
the mounting screws located at the top and the bottom of the
terminal block. The board may now be withdrawn from its mounting
compartment.
Before a new board is installed, make certain that the dip switches
are properly set. Refer to Table 5.1 and Table 5.2. Installation is the
opposite of removal.
6.4 STOP ASSEMBLY REPLACEMENT
If the stop assembly becomes worn it should be replaced.
To replace, close the contactor with test power. Remove the
two bolts securing the assembly to the baseplate. Install a new
assembly. Hand-tighten bolts. Set gap between the armature plate
and stop to 0.534 in. 0.004 in. using adjustment block provided with
replacement stop assembly, torque bolts to 214 lb-in (24.2 N-M).
(See Figure 6.11)
6.5 AUXILIARY CONTACT MAINTENANCE AND
REPLACEMENT
If standard contact blocks become oxidized due to very low current
levels passing through the contacts, they may be cleaned by
periodically disconnecting them from the circuit and circulating
approximately 10 amps through the contacts for a short period of
time. If one or more of the auxiliary contacts fail, it is recommended
that the complete contact block assembly be replaced. Disconnect
wiring to each contact, making sure to properly mark each wire
to insure proper reconnection. Remove the two mounting screws
securing the contact assembly to the bearing retainer. Install the
replacement assembly, securing with the two mounting screws. The
contacts are properly adjusted when the plunger to operating arm
gap is .110 inches. (Figures 6.12 and 6.13).
Figurt 6.5. RtmNval Nf Vacuum Inotrrupotr
Figurt 6.6. InsoallaoiNn Nf BNlo and Shuno SuppNros
