5–17Part Replacement Procedures
Publication 1336 IMPACT-6.8 – November, 2002
!
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.
1. Remove power and check for zero voltage in the drive. Refer to
Opening the Drive Enclosure in Chapter 3, Access Procedures.
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.
2. Remove the screws fastening the Input Rectifier Snubber Board
to the Copper Plate.
3. Remove the nut from the stud on the other side of the SCR Heat
Sink and disconnect the white Snubber Board wire from the stud.
Refer to Figure 5.9.
4. Remove the Snubber Board.
Installation
Install the Input Rectifier Snubber Board in reverse order of removal.
Refer to Table 3.A – Fastener Torque Specifications in Chapter 3,
Access Procedures.
!
ATTENTION: Replace all guards before applying
power to the drive. Failure to replace guards may result
in death or serious injury.
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