Rockwell Automation 20B PowerFlex 700 Drive Components Replacement - Frame 8 - Manual (Page 57)

Rockwell Automation Publication 20B-IN024C-EN-P - June 2012 57
Component Replacement Procedures Chapter 3
5. Disconnect the three AC busbars (R, S, T) at the top only.
You do not need to remove the wires from the AC busbars.
6. Label and note the position of the converter SCR module leads. Remove
the leads.
Typically, the leads are marked as R, S, or T, and each is notched with the
notch to the front of the converter SCR module.
7. Remove the four Phillips screws that hold each converter SCR to the
heatsink and remove the converter SCR modules.
Install Components
1. Use isopropyl alcohol to thoroughly clean the mounting surface of the
heatsink and the mounting surface of each new converter SCR module.
2. Use a 3- or 4-inch paint roller or putty knife to apply a thin, even coating of
the supplied thermal grease to the mounting surface of each new converter
SCR module.
3. Install each new converter SCR module with supplied screws and tighten
using this torque sequence:
4. Replace the SCR module leads.
Each set of leads is marked R, S, or T. The notch and red wire on each lead
are positioned to the front.
5. Install the converter busbars per diagram in
step 2 and torque to 9.0 N•m
(80 lb•in).
6. Install the snubber boards, oriented with the serial number at the top, and
torque to 2.9 N•m (26 lb•in).
7. Replace the wires from the converter snubber resistors to the snubber
boards.
The black wire goes to J1. The blue wire goes to J2.
8. Reinstall AC busbars (R, S, T). Torque to 9.0 N•m (80 lb•in).
IMPORTANT
In the next step, take care to not disturb any of the thermal grease on
the converter SCR module.
➊ ➌
➍ ➋
SCR Torque
First Sequence:
0.7 N-m (6.0 lb.-in.)
SCR Torque
Final Sequence:
5.6 N-m (50 lb.-in.)
➌
➍ ➋
➊