5–5Part Replacement Procedures
Publication 1336 IMPACT-6.2 – March 1998
!
ATTENTION: Wear a wrist-type grounding strap
when servicing 1336 IMPACT drives. Failure to
protect drive components against ESD may damage
drive components. Refer to Electrostatic Discharge
Precautions at the beginning of this chapter.
Important: Before you remove connections and wires from the
drive components, mark the connections and wires to
correspond with their component connections and
terminals to prevent incorrect wiring during assembly.
1. Remove power from the drive.
2. Check for zero volts at TB1 terminals +DC and –DC.
3. Check for absence of control voltage at:
• TB10
• TB11
• L Option Board (if used)
4. Remove the Main Control Board Mounting Plate. Refer to
Chapter 3 – Disassembly and Access Procedures, Removing the
Main Control Board Mounting Plate.
5. Remove the Precharge Board. Refer to Chapter 3 – Disassembly
and Access Procedures, Removing the Precharge Board.
6. Disconnect the Ground Sense CT from Gate Driver Board
connector J2.
7. Remove the following from the Ground Sense CT Bus Bars:
• DC Bus Inductor wire L3
• DC Bus Inductor wire L2. Note that the positive (+) and
negative (–) DC wires from TB1 do not need to be removed
from the bus bars.
• The screw fastening the positive (+) bus bar to the standoff
• The screw and nut assembly fastening the positive (+) bus bar
to the bus bar extension from Bus Capacitor Bank terminal E1
• The two screws fastening the negative (–) bus bar to the Bus
Capacitor Bank terminal E2
8. Remove the nut fastening the Ground Sense CT to the Main
Chassis.
9. Remove the screw fastening the Ground Sense CT to the TB1
Mounting Plate.
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