5–22 Part 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.
Access the Main Chassis:
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 Precharge Board. Refer to Chapter 3 – Disassembly
and Access Procedures, Removing the Precharge Board.
5. Remove the Gate Driver Board. Refer to
Chapter 3 – Disassembly and Access Procedures, Removing the
Gate Driver Board.
Remove the Bus Capacitor Bank:
1. Remove the Load-Sharing Resistor wires from the Bus Capacitor
Bank stake-on connectors.
2. Remove the four screws fastening the Snubber Board Bus Bars to
the Bus Capacitor Bank terminals E10 (+) and E11 (–).
3. Loosen the screws fastening the Snubber Board negative Bus Bar
to the Snubber Board.
!
ATTENTION: These screws are fastened with nuts
located under the Snubber Board. Removing the screws
requires removing the Snubber Board to fasten the bus
bar to the Snubber Board.
4. Remove the four screws fastening the Ground Sense CT Bus Bars
to Bus Capacitor Bank terminals E1 (+) and E2 (–).
5. Remove the three nuts and washers fastening the left side of the
Bus Capacitor Bank to the Main Chassis.
AB Spares
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