7.2.16 IGBT Modules D2/D4 Units
1.
Remove the capacitor banks per instructions.
2.
Note the IGBT gate signal cables connected between gate drive card connectors MK100
(temperature sensor), MK102 (U), MK103 (V), and MK104 (W) and IGBTs. These will
need to be reconnected in the same locations during reassembly. Units with a brake
option will have brake cabling from MK105 in addition. Disconnect the cables at the con-
nectors on the IGBT modules.
3.
Remove the retaining nuts (8 mm) from the SCR input bus bars.
4.
Note the color coding for each of the three wires attached to the retaining studs. Ensure
that the correct wire is attached to the applicable stud during reassembly. Remove the
wiring from the studs.
5.
Remove screw (T25) from terminal 1 of each SCR/diode module by accessing the screw
through the access hole in the SCR/diode input bus bar. Remove the SCR input bus bars.
6.
Remove each IGBT output bus bar by removing the nut (10 mm) from the stud. Also
remove retaining screw (T30) at the other end of the IGBT output bus bars (not shown).
CONTINUED ON NEXT PAGE
130BX91.10
1
2
3
4
5
6
1
1
7
8
Figure 7.23: D2/D4 IGBT Modules (1 of 3)
1
SCR/diode input bus bar BB21 or BB22 per drive power rating
5
Snubber capacitor
2
SCR/diode terminal screw (Step 5)
6
IGBT output bus bar retaining nut (Step 6)
3
SCR/diode input bus bar retaining nut and stud (Steps 3 & 4)
7
SCR/diode terminal screw (Step 5)
4
IGBT gate signal input terminal (Step 2)
8
IGBT output bus bar BB32 (Step 6)
High Power Service Manual for VLT
®
FC Series
Adjustable Frequency Drives
7 D-Frame Sizes Disassembly and Assembly
Instructions
MG.90.L1.22 - VLT
®
is a registered Danfoss trademark
7-25
7
Summary of Contents for VLT HVAC FC 100
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