11.2.22 Twistlock DC Capacitors
To remove or reinstall twistlock DC capacitors, use the
following steps.
NOTICE
CAPACITOR REPLACEMENT
When replacing DC capacitors, always replace the entire
bank of capacitors, even if only 1 DC capacitor has failed.
NOTICE
CAPACITOR TYPE
Drives can contain standard DC capacitors or twistlock
DC capacitors. Use the twistlock DC capacitor
instructions for drives manufactured within the following
time period.
•
240/400 V drives produced week 18, 2018 or
after.
•
690 V drives produced week 23, 2018 or after.
For all other drives of this size, refer to
chapter 11.2.20 Standard DC Capacitors
.
Disassembly in 240/400 V AC units
To remove the twistlock DC capacitors from 240/400 V AC
units, use the following steps. Refer to
.
1.
Remove the gate drive card. Refer to
chapter 11.2.14 Gate Drive Card
.
2.
Remove the balance/high frequency card. Refer to
chapter 11.2.13 Balance/High Frequency Card
.
3.
Remove the DC bus rails. Refer to
.
4.
Remove insulator sheet 1 from the capacitor
bank.
5.
To remove the IGBT output busbars:
5a
Remove 3 thread-forming screws (T20),
1 per busbar.
5b
Remove 6 screws (T40), 2 per busbar.
6.
Remove the snubber capacitors, 1 from each IGBT
module, by removing 2 screws (T40) from each
snubber capacitor.
7.
To remove the DC(+) plate:
7a
Remove 1 standoff (8 mm) connecting
the DC(+) plate to the positive terminal
of capacitor 3.
7b
Remove the screws (T25) connecting the
DC(+) plate to the positive terminals of
capacitors 1, 2, 4, 9, and 12. The number
of screws varies based on the size of the
drive.
8.
Remove insulator sheet 2 from between the
DC(+) plate and the DC(-) plate. If necessary, first
remove the screws connecting the DC(-) plate
and the midplate to the capacitors.
9.
To remove the DC(-) plate:
9a
Remove 1 standoff (8 mm) connecting
the DC(-) plate to the negative terminal
of capacitor 6.
9b
Remove the screws (T25) connecting the
DC(-) plate to the negative terminals of
capacitors 5, 7, 8, 10, and 11. The
number of screws varies based on the
size of the drive.
10.
Remove insulator sheet 3 from between the DC(-)
plate and the midplate. If necessary, first remove
the screws connecting the midplate to the
capacitors.
11.
To remove the midplate:
11a
Remove 1 standoff (8 mm) connecting
the midplate to the negative terminal of
capacitor 2.
11b
Remove the screws (T25) connecting the
midplate to the negative terminal of
capacitors 1, 3, 4, 9, and 12. The number
of screws varies based on the size of the
drive.
11c
Remove the screws (T25) connecting the
plate to the positive terminal of
capacitors 5, 6, 7, 8, 10, and 11. The
number of screws varies based on the
size of the drive.
12.
Remove the capacitor locking panel by removing
the 10 thread-forming screws (T25).
13.
To remove a twistlock DC capacitor, use the
special tool provided in the parts kit (or grip the
edges with a large pliers).
14.
Turn the twistlock DC capacitor approximately 30°
counterclockwise to release it. Pull the capacitor
out of the housing.
Reassembly in 240/400 V AC units
Reinstall in reverse order of this procedure. Tighten
hardware according to
chapter 14.1 Fastener Torque Ratings
.
D2h/D4h/D7h/D8h/J9 Unit Dis...
VLT
®
FC Series, D1h–D8h, Da2/Db2/Da4/Db4, E1h–E4h, J8/J9
224
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