Appendix O: Retrofitting on GE Type VR-1
Siemens Industry, Inc. 86
O: RETROFITTING AN MJ5, MJ-XL or MJ-4A CONTROL PANEL ONTO
A GE TYPE VR-1 OR ML-32 VOLTAGE REGULATOR
Retrofit Kit Contents
- Instructions and drawings 21-116-601-240 & 21-116-681-003
- GE Hinges (2)
- GE PDS plug wiring harness (1)
- Metal Bracket (1)
- Philips-head screws (6)
- Lock washers (2)
- Hex nuts (2)
- Washers (4)
Removing the GE Control Panel
Follow the GE instruction manual for removing the control panel, which should include, but is not
limited to the following steps.
1) Remove GE plug from bottom of voltage regulator position indicator (CT shorts).
2) Look to see which terminal on the terminal block has jumper to NN9 (could be NN20,
NN21, or NN22). It is VERY IMPORTANT to jumper NN9 to this same terminal in
step 7 below. It determines the voltage applied to the panel.
3) Remove all wires from the bottom of the terminal strips inside the cabinet, including
the jumper to the cabinet ground and the jumper from NN9 to NN21 (or 20 or 22).
Make sure that no wires remain connected to the bottom of either terminal block. No
wires will be disturbed on the top of either terminal block.
4) Remove GE circuit board from back of cabinet and remove pins from hinges on right
side of the GE front panel (keep pins for step 11). Remove front panel. Cabinet
5) should now be empty except for two (2) terminal blocks and the wires on the top of
each.
Installing the MJ- Control Panel
1) Connect wires from Siemens GE retrofit wiring harness to the bottom of each terminal
block, making sure each wire marker matches the terminal block “NN” number (See
table below).
2) Connect the jumper wire from NN26 to the ground stud in the cabinet.
3) Connect the jumper wire from NN9 to the terminal noted in step 2 above (either
NN20, 21 or 22).
4) Mount the Siemens PDS receptacle (using the DIN) rail to the two studs below the
terminal blocks. Install a flat washer, then the DIN rail, then another flat washer, lock
washer, and nut. Tighten.
5) Reconnect the GE plug to the bottom of the voltage regulator position indicator. From
now on, removing the Siemens PDS plug will short the CT without removing the GE
plug.
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