5–42 Part Replacement Procedures
Publication 1336 IMPACT-6.8 – November, 2002
Replacing Volt-Sharing Resistors and Dual Diodes
The Volt-Sharing Resistors and Dual Diodes are mounted on the
Balancer Plate Assembly. This assembly is located on the right wall
of the Capacitor Bank 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 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
Referring to Figure 4.6, remove the appropriate Volt-Sharing
Resistors and/or Dual Diodes.
2. Remove the appropriate Resistor leads from the Bus Capacitors.
3. Remove the appropriate Diode leads.
4. Remove the three screws holding the Balancer Plate Assembly to
the side of the Capacitor Assembly.
5. Remove the Volt-Sharing Resistors and Dual Diodes from the
Balancer Plate Assembly.
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