Soft Charge (Sc) Resistors D2/D4 Units - Danfoss VLT HVAC Drive FC 100 Service Manual

High Power Service Manual for VLT
Adjustable Frequency Drives

7.2.8 Soft Charge (SC) Resistors D2/D4 Units

1. Remove the upper capacitor bank assembly in accordance with procedure.
2. The MK4 connector on the soft charge card must be disconnected. Disengage the soft
charge card far enough to access the MK4 (see Figure 7-3) in accordance with steps 1-3
in the soft charge card disassembly procedure.
3. Note that the soft charge resistor is located under the bus bars and held in place by 2
retaining nuts. Bus bars do not need to be removed. Loosen the retaining nut (8 mm)
furthest to the right.
4. Remove the 8 mm retaining nut furthest to the left.
5. Lift the left side of the SC resistor and remove the resistor by sliding it to the left and out
from under the bus bars.
Reinstall in reverse order of this procedure. Tighten the 8 mm mounting nuts to 2.3 Nm (20 in-
lbs). Tighten 10 mm mounting nuts to 4 Nm (35 in-lbs).
Figure 7.7: D2/D4 Soft Charge Resistor
380–480/500V: Clear wire leads.
1
2
3
®
FC Series
NOTE!
On D2/D4 units, only the upper cap bank assembly is removed.
1
Bus bars BB27 (do not remove)
Soft charge resistor
Retaining nut (loosen) (Step 3)
MG.90.L1.22 - VLT ® is a registered Danfoss trademark
7 D-Frame Sizes Disassembly and Assembly
2
525–690 V: Black wire leads.
Instructions
7
3
7-9