22
Instruction Book
IB02707112E
August 2015
50/75VCPW-VSR
Breaker To Vacuum Starter Replacement Unit
EATON CORPORATION www.eaton.com
Figurt 6.7. RtmNvt oht CNil MNunoing Anglt
6.6 MECHANICAL LATCH
6.6.1 LATCH REMOVAL
1. Remove latch control wires from terminals 7 & 8 on contactor oil
control board.
2. Remove the four 8mm x 1.25 bolts from the underside of the
base plate that secure the latch assembly to the base plate.
3. Remove the two 6mm x 1.0 bolts from the front of the contactor
that secure the roller bracket assembly to the armature plate.
Tablt 6.1. Unlaoch CNil Imptdanct
Coil Volts
Impedance
24
0.77 - 0.95
48
2.95 - 3.55
110 / 120 / 125
10.97 - 11.19
220 / 240
44.57 - 54.57
COIL CHECKOUT AND REPLACEMENT
If the contactor fails to open when the unlatch coil is energized, the
coil may be faulty. To determine if the coil has the proper resistance,
connect an ohmmeter across the coil leads where they are
connected to the bridge rectifier. Refer to Table 6.1 for the correct
impedance for the different voltage coils.
If the coil impedance is not within the range in Table 6.1, it must be
replaced. Follow the steps below for replacement.
1. Remove latch control wires from terminals 7 & 8 on contactor coil
control board.
2. Remove the four 8mm x 1.25 bolts from the underside of the
base plate that secure the latch assembly to the base plate.
3. Remove latch coil retaining bolt (8mm x 1.25), Figure 6.14, and
remove all components secured by this bolt.
4. Remove the 4mm x .7 screw securing bridge diode to latch coil
bracket.
5. Remove old coil from core.
6. Insert coil core into new coil, insuring rubber gasket is between
core and coil bobbin.
Figurt 6.8. RtmNvt oht LNckNuo Stcuring oht Rtourn Spring BNlo
Figurt 6.9. Unscrtw oht Rtourn Spring Asstmbly
Figurt 6.10. Insoall Ntw CNils Nn CNrts
Figurt 6.11. SoNp Asstmbly Adjusomtno BlNck
