1. Remove all wiring and links from the soft starter before dismantling the unit.
2. Remove the unit cover (4 screws).
3. Unscrew the main plastic and fold away from the starter (4 screws).
4. Unplug the keypad loom from CON 1 (see note).
5. label each SCR firing loom with the number of the corresponding terminal on
the main control PCB, then unplug the looms.
6. Unplug the thermistor, fan and CT wires from the main control PCB.
NOTE
Remove the main plastic slowly to avoid damaging the keypad wiring loom which runs between the main plastic and the
backplane PCB.
1. Unscrew and remove the magnetic bypass plates (models MCD5-0620C to
MCD5-1600c ONLY).
2. Remove the CT assembly (three screws).
3. Identify which bus bars are to be moved. Remove the bolts holding these bus
bars in place then slide the bus bars out through the bottom of the starter
(four bolts per bus bar).
1. Slide the bus bars in through the top of the starter. For input bus bars, the
short curved end should be outside the starter. For output bus bars, the
unthreaded hole should be outside the starter.
2. Replace the dome washers with the flat face towards the bus bar, then
tighten the bolts holding the bus bars in place to 20 Nm.
3. Place the CT assembly over the input bus bars and screw the assembly to the
body of the starter (see note).
4. Run all wiring to the side of the starter and secure with cable ties.
Table 11.1
NOTE
If moving the input bars, the CTs must also be reconfigured.
1.
Label the CTs L1, L2 and L3 (L1 is leftmost when working from the front of the starter). Remove the cable ties and
unscrew the CTs from the bracket.
2.
Move the CT bracket to the top of the starter. Position the CTs for the correct phases, then screw the CTs to the
bracket. For models MCD5-0360C - MCD5-0930, the CTs must be placed on an angle (the left hand legs of each CT
will be on the top row of holes and the right hand legs will be on the bottom tabs).
Bus Bar Adjustment Procedur...
MCD 500 Operating Instruction
MG17K402 - VLT
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