3–7Access Procedures
Publication 1336 IMPACT-6.8 – November, 2002
Opening
!
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 from the drive, including all remote power
sources.
!
ATTENTION: Disconnect and lock out power from
the drive before disassembling the drive. Failure to
disconnect power may result in death or serious injury.
2. Turn the Inverter Bay door latches 1/4 turn counterclockwise to
open the enclosure door.
3. Turn the latches, located on the left side of the Precharge Board
Mounting frame, to open the Precharge Board Mounting Frame.
Refer to Figure 3.4.
4. Check for zero volts between +DC and –DC. Refer to Figure 3.5.
!
ATTENTION: 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.
!
ATTENTION: A blown fuse can create a hazard of
shock which may result in death or serious injury.
Check voltage between the bus bar and both ends of all
three fuses.
5. Refer to Figure 3.5. Check for the absence of control voltage at:
• TB10
• TB11
• L Option Board (if used)
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