Download IMPACT Adjustable Frequency AC Drive

5–30
Part Replacement Procedures
Replacing Inverter Bay Fan Assemblies
Two fans are located at the bottom of the Inverter Assembly. Both
fans can be replaced without pulling out 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.
1. Remove power and check for zero voltage in the drive. Refer to
Opening the Drive Enclosure 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.
Refer to Figure 5.16, and the following steps to remove Fan 1.
1. Disconnect wires leading to the resistors on the resistor assembly.
2. Disconnect Fan 1 and Fan 2 connectors.
3. Open thumb latch on Resistor Assembly.
4. Remove Resistor Assembly by tilting the top of the assembly
forward and then lifting. (You must clear the lip that catches on
the bottom rear of the assembly.)
5. Remove either the Cabinet Bottom Bracket or Fan 2 to get the
clearance required to remove Fan 1.
6. Pull down on both spring pins fastening Fan 1 to the Inverter
Assembly.
Publication 1336 IMPACT-6.8 – November, 2002