Dc Capacitors; Ac Power Size - Danfoss VLT FC 100 Service Manual

Disassembly and Assembly In...
10. Remove the snubber capacitor from each IGBT
module by removing the two screws (T30)
mounting the capacitor to the IGBT module.
11. Remove the (-) DC plate by removing:
12. Remove the Mylar insulator between the (-) DC
plate and the (+) DC plate. The screws
7 7
connecting one of the two DC center plates to
the capacitors may have to be removed to
remove the insulator.
13. Remove the (+) DC plate by removing three
screws (T20 thread-forming) next to the IGBT
modules and two screws (T25) connecting the
plate to the positive terminals of capacitors 5 and
6.
14. Remove the plastic IGBT support (not shown) by
removing four screws (T25).
15. Remove the IGBTs by removing four screws (T25)
from each.
For reassembly, use the replacement IGBT instructions.

7.3.19 DC Capacitors

NOTICE!
When performing this procedure, always replace the
entire capacitor bank even if only one capacitor has
failed.
7.3.19.1 400 V AC Power Size
1. Remove the gate drive card in accordance with
chapter 7.3.14 IGBT Gate Drive Card.
2. Remove the balance/high frequency card in
accordance with chapter 7.3.11 Balance/High
Frequency Card.
3. Remove the Mylar cover from the capacitor bank.
4. Remove the round bus bar support bracket by
removing three screws (T30).
5. Remove one screw (T25 thread-forming) from
each IGBT output bus bar, one bus bar per IGBT
module.
100
•
Three screws (T20 thread-forming) next
to the IGBT modules
•
One standoff (0.3 in [8 mm]) connecting
the plate to the negative terminal of
capacitor 1
•
One screw (T25) from the negative
terminal of capacitor 3
•
One round plastic alignment cap
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
Service Manual
6.
7.
8.
9.
10.
11.
12.
Reinstall in reverse order of this procedure and tighten
hardware according to chapter 1.7 General Torque
Tightening Values.
NOTICE!
Note for reassembly: DC capacitor must fit into the
retaining stud at the bottom.
Remove the IGBT bus bar by removing two
screws (T30) from each IGBT output bus bar, one
bus bar per IGBT module.
Remove the snubber capacitor, one from each
IGBT module by removing two screws (T30).
Remove the (-) DC plate by removing:
•
Three screws (T20 thread-forming) next
to the IGBT modules
•
One standoff (0.3 in [8 mm]) connecting
the plate to the negative terminal of
capacitor 3
•
Screws (T25) connecting the plate to the
negative terminals of capacitors 4 and 5.
Number of T25 screws varies based on
the size of the adjustable frequency
drive
Remove the Mylar insulator between the (-) DC
plate and the (+) DC and DC center plates. The
screws connecting the (+) DC and DC center
plates to the capacitor may have to be removed
to remove the insulator.
Remove the (+) DC plate by removing:
•
Three screws (T20 thread-forming)
adjacent to the IGBT modules
•
One standoff (0.3 in [8 mm]) connecting
the plate to the positive terminal of
capacitor 2
•
Screws (T25) connecting the plate to the
positive terminals of capacitors 1 and 6.
Number of T25 screws varies based on
the size of the adjustable frequency
drive
Remove the DC center capacitor plate by
removing one standoff (0.3 in [8 mm]) connecting
the plate to the negative terminal of capacitor 1
and the screws (T25) connecting the plate to the
remaining capacitors. Number of T25 screws
varies based on the size of the adjustable
frequency drive.
Remove the capacitor locking panel by removing
twelve screws (T25 thread-forming).
MG94A222