Dc Bus Rails - Danfoss VLT FC Series Service Manual

E1h–E4h Drive Disassembly a...

13.2.27 DC Bus Rails

The DC bus rails run from the inductor to the capacitor
bank on the right and left sides of E1h–E4h drives. To
remove or reinstall the DC bus rails, use the following
steps. Refer to Illustration 13.34.
Disassembly
1. Remove the power card mounting plate. Refer to
chapter 13.2.3 Power Card Mounting Plate.
2. Remove the input plate. Refer to
chapter 13.2.9 Input Plate with Busbars and
chapter 13.2.10 Split Input Plate with Options.
3. If the brake option is present, remove the vertical
brake busbars. See chapter 13.2.25 Vertical Brake
Busbars.
4. Remove the left and right IGBT output busbars.
Refer to chapter 13.2.15 Current Sensors.
5. To remove the right DC(-) bus rail:
5a Remove 2 nuts (13 mm) from the
bottom of the bus rail.
5b If the optional brake is present, remove
2 nuts (13 mm) from the middle of the
bus rail.
5c Remove 1 screw (T40) from the top of
the bus rail.
5d Remove 2 screws (T25) from the top of
the bus rail.
5e Lift the right DC(-) bus rail from the unit.
6. To remove the left DC(+) bus rail:
6a Remove 2 nuts (13 mm) from the
bottom of the bus rail.
6b Remove 1 screw (T40) from the top of
the bus rail.
6c Remove 2 screws (T25) from the top of
the bus rail.
6d Remove the zip ties connecting the
cables to the bus rail.
6e Lift the left DC(+) bus rail from the unit.
MG94A502
Service Guide
Reassembly
Tighten fasteners according to chapter 14.1 Fastener Torque
Ratings.
1.
2.
3.
4.
5.
6.
Danfoss A/S © 02/2019 All rights reserved.
To replace the left DC(+) bus rail:
1a Position the left DC(+) bus rail in the
drive, and fasten 2 screws (T25) at the
top of the bus rail.
1b Secure 1 screw (T40) at the top of the
bus rail.
1c Secure 2 nuts (13 mm) at the bottom of
the bus rail.
To replace the right DC(-) bus rail:
2a Position the right DC(-) bus rail in the
drive, and fasten 2 screws (T25) at the
top of the bus rail.
2b Secure 1 screw (T40) at the top of the
bus rail.
2c If the optional brake is present, secure 2
nuts (13 mm) in the middle of the bus
rail.
2d Secure 2 nuts (13 mm) in the bottom of
the bus rail.
Replace the left and right IGBT output busbars.
Refer to chapter 13.2.15 Current Sensors.
If the brake option is present, replace the vertical
brake busbars. See chapter 13.2.25 Vertical Brake
Busbars.
Replace the input plate. Refer to
chapter 13.2.9 Input Plate with Busbars and
chapter 13.2.10 Split Input Plate with Options.
Replace the power card mounting plate. Refer to
chapter 13.2.3 Power Card Mounting Plate.
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