5–19Part Replacement Procedures
Publication 1336 IMPACT-6.2 – March 1998
Removal
!
ATTENTION: Disconnect and lock out power from
the drive before disassembling the drive. Failure to
disconnect power may result in death or serious injury.
Verify bus voltage by measuring the voltage between
+DC and –DC on terminal block TB1. Do not attempt
to service the drive until the bus voltage has discharged
to zero volts.
!
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.
6. Remove the Bus Capacitor Bank. Refer to Bus Capacitor Bank in
this chapter.
Remove the TB1 Mounting Plate and DC Bus Inductor L1:
1. Remove the following from the drive-connection side of TB1:
• Ground wires
• Wires at terminals U, V, and W (T1, T2, and T3)
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