5–39Part Replacement Procedures
Publication 1336 IMPACT-6.8 – November, 2002
Replacing Bus Capacitors
The Bus Capacitor Bank is located on the right side of the Inverter
Bay, in the Capacitor Bank Assembly. Replace any capacitors that
show signs of swelling, leaks, or burn marks.
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 in Chapter 3, Access Procedures.
!
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 Capacitor Bank Assembly
• Removing the Motor Buses
Referring to Figure 5.21 and the following steps, access the
Capacitors:
1. Remove the screws fastening the wires from the Balancer Plate
assembly to the capacitors.
2. Remove the screws, nuts, and washers fastening the Capacitor
Laminated Bus Bar to the capacitors.
3. Remove the Capacitor Laminated Bus Bar and attached
components.
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