78 Rockwell Automation Publication 20P-TG002B-EN-P - February 2018
Chapter 3 Part Replacement Procedures
• Apply thermal grease to the bottom of the SCR and dual diode modules
before securing it to the heatsink.
• Tightening torque for the screws connecting the SCR and dual diode
modules to the heatsink and the screws connecting the field circuit
board to the SCR and dual diode modules is 2.5…4.0 N
•m
(22…35 lb
•in).
AC Line Snubber Circuit Board
and Resistors Replacement
Remove the AC Line Snubber Circuit Board and Resistors
Follow these steps to remove the AC line snubber circuit board and resistors.
1. Read the General Safety Precautions on page 10
.
2. Remove power from the drive (see page 42
).
3. Remove the protective covers from the drive (see page 43
).
4. Remove the pulse transformer and switching power supply boards from
the drive (see page 62
). You do not need to remove the switching power
supply board from the back of the pulse transformer board for this
procedure.
5. Remove the field circuit board (see page 75
).
6. Remove the two screws and washers that secure the (red and blue) wires
from the AC line snubber board to the bus bars and remove the wires.
ATTENTION: Thermal grease must be applied to the bottom of the SCR and
dual diode modules before securing them to the heatsink or damage to the
drive may occur.
IMPORTANT Mark all connections and wires before removal to avoid incorrect
wiring during reassembly.
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