5–20 Part Replacement Procedures
Publication 1336 IMPACT-6.8 – November, 2002
Replacing a Power Module
The Power Modules are located on the heat sink toward the back of
the Inverter Assembly. If one or more Power Modules is replaced,
you must check the Power Module Snubber Board, the Common Bus
Precharge Board, and the Gate Driver Board.
Removal
!
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.
!
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 zero bus voltage by measuring the voltage
between the Negative Capacitor Bus and both ends of
all three bus fuses. An open fuse does not show voltage
across both ends of the fuse. Failure to measure voltage
at both ends of the fuses may result in death or serious
injury. Refer to Figure 3.5. Do not attempt to service the
drive until the bus voltage has discharged to zero volts.
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. Perform the following procedures in Chapter 3, Access
Procedures.
• Opening the Drive Enclosure
• Removing the Control Board Mounting Plate
• Removing the Precharge Board Mounting Frame
• Pulling the Inverter Assembly
2. Referring to Removing the Power Module Snubber Board in this
chapter, remove the Power Module Snubber Board.
3. Remove the screws fastening the positive and negative Snubber
Bus Bars to the Power Module Bus Bar.
4. Remove the screws fastening the Power Module Bus Bar to the
Power Modules.
5. Carefully remove the bus bar. Do not damage the Insulator.
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