Delta 28-299A Operations Instructions download pdf (Page 75)

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.

Bus Bar Adjustment Procedur... MCD 500 Operating Instruction

74 MG.17.K3.02 - VLT

is a registered Danfoss trademark

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Delta 28-299A Operations Instructions Page 75