4.
Remove the Mylar cover from the capacitor bank.
5.
Remove the one screw (T20 thread-forming) from
each IGBT output bus bar.
6.
Remove the IGBT output bus bar by removing
two screws (T40) connecting the bus bar to the
IGBT module.
7.
Remove the IGBT temperature cable by discon-
necting the cable from each IGBT module.
8.
Remove the gate leads, one from each IGBT.
9.
Remove the snubber capacitor from each IGBT
module by removing two screws (T40).
10.
Remove the (+)DC plate by removing one
standoff (0.3 in [8 mm]) connecting the plate to
the positive terminal of capacitor 3, and screws
(T25) connecting the plate to the positive
terminals of capacitors 1, 2, 4, 9, and 12. Number
of T25 screws varies based on the size of the
adjustable frequency drive.
11.
Remove the insulator between the (+)DC plate
and the (-)DC plate. The screws connecting the
(-)DC plate and the DC center plate to the
capacitors may have to be removed to remove
the insulator.
12.
Remove the (-)DC plate by removing one standoff
(0.3 in [8 mm]) connecting the plate to the
negative terminal of capacitor 6, and screws (T25)
connecting the plate to the negative terminals of
capacitors 5, 7, 8, 10, and 11. Number of T25
screws varies based on the size of the adjustable
frequency drive.
13.
Remove the plastic IGBT support (not shown) by
removing seven screws (T25) and removing the
IGBT modules from beneath the support.
14.
Remove the IGBTs by removing ten screws (T25)
from each IGBT module.
For reassembly, use the replacement IGBT instructions.
7.4.19.2 690 V AC Power Size
1.
Remove the gate drive card in accordance with
chapter 7.4.14 IGBT Gate Drive Card
.
2.
Remove the balance/high frequency card in
accordance with
.
3.
Remove the DC bus rails in accordance with
.
4.
Remove the Mylar cover from the capacitor bank.
5.
Remove the one screw (T20 thread-forming) from
each IGBT output bus bar.
6.
Remove the IGBT output bus bar by removing
two screws (T40) connecting the bus bar to the
IGBT module.
7.
Remove the IGBT temperature cable by discon-
necting the cable from each IGBT module.
8.
Remove the gate leads, one from each IGBT.
9.
Remove the snubber capacitor from each IGBT
module by removing two screws (T40).
10.
Remove the (+)DC plate by removing two screws
(T20 thread-forming) and screws (T25) connecting
the plate to the positive terminals of capacitors 4,
8, 10, and 12. Number of T25 screws varies based
on the size of the adjustable frequency drive.
11.
Remove the Mylar insulator between the (+)DC
plate and the (-)DC plate. The screws connecting
(-)DC plate and the two DC center plates to the
capacitors may have to be removed to remove
the insulator.
12.
Remove the (-)DC plate by removing one standoff
(0.3 in [8 mm]) connecting the plate to the
negative terminal of capacitor 2, and screws (T25)
connecting the plate to the negative terminals of
capacitors 1, 5 and 6. Number of T25 screws
varies based on the size of the adjustable
frequency drive.
13.
Remove the plastic IGBT support (not shown) by
removing seven screws (T25) and removing the
IGBT modules from beneath the support.
14.
Remove the IGBTs by removing ten screws (T25)
from each IGBT module.
For reassembly, use the replacement IGBT instructions.
Disassembly and Assembly In...
Service Manual
MG94A222
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
111
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Summary of Contents for VLT FC 103
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