5–23Part Replacement Procedures
Publication 1336 IMPACT-6.8 – November, 2002
Replacing a Power Module Snubber Resistor
The Power Module Snubber Resistors are located on the Main Heat
Sink at the back of the Inverter Assembly.
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. Remove the Power Module Snubber Resistor connectors from the
J1 and J2 connectors on the Power Module Snubber Board.
3. Remove the screws fastening the Power Module Snubber Resistor
to the Main Heat Sink.
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