Troubleshooting guide

1336 PLUS II - 6.16 - June, 2001
Chapter
4
Disassembly and Access Procedures
Chapter Objectives
This chapter describes general disassembly procedures required to remove
the Control Interface Board and Main Control Board on A1 to A4 frame
drives. Fan replacement is also detailed for A4 frame drives.
Disassembly and Access
Overview
Electrostatic Discharge
Precautions
Electrostatic Discharge generated by static electricity can damage the
complimentary metallic oxide semiconductor devices on various drive
boards. It is recommended that you perform these procedures to guard
against this type of damage when circuit boards are removed or installed.
• Wear a wrist type grounding strap that is grounded to the chassis.
• Attach the wrist strap before removing the new circuit board from the
conductive packet.
• Remove boards from the drive and immediately insert them into their
conductive packets.
!
ATTENTION:
Some printed circuit boards and drive
components may contain hazardous voltage levels. Remove and
lock out power before you disconnect or reconnect wires, and
before you remove or replace fuses and circuit boards. Verify bus
voltage by measuring the voltage between +DC and -DC on
Terminal Block TB1. Do not attempt to service the drive until the
bus voltage has discharged to zero volts.
ATTENTION:
Servicing energized industrial control
equipment can be hazardous. Electrical shock, burns, or
unintentional actuation of controlled industrial equipment may
cause death or serious injury. Follow the safety-related practices
of NFPA 70E, Electrical Safety for Employee Workplaces, when
working on or near energized equipment. Do not work alone on
energized equipment.
!
ATTENTION:
This assembly contains parts and
sub-assemblies that are sensitive to electrostatic discharge. Static
control precautions are required when servicing this assembly.
Component damage may result if you ignore electrostatic
discharge control procedures. If you are not familiar with static
control procedures, reference Allen-Bradley Publication
8000-4.5.2, Guarding Against Electrostatic Discharge, or any
other applicable ESD protection handbook.