Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 157
Chapter 9
Troubleshooting
Introduction
For safety of maintenance personnel and others who might be exposed to
electrical hazards associated with maintenance activities, follow the local safety
related work practices (for example, NFPA 70E, Part II in the United States).
Maintenance personnel must be trained in the safety practices, procedures, and
requirements that pertain to their respective job assignments.
The flowchart in Figure 49
aids in quick troubleshooting.
SHOCK HAZARD: Hazardous voltage is present in the motor circuit even when
the controller is off. To avoid shock hazard, disconnect main power before
working on the controller, motor, and control devices (for example, Start-Stop
push buttons). Procedures that require parts of the equipment to be energized
during troubleshooting, testing, etc., must be performed by properly qualified
personnel using appropriate local safety work practices and precautionary
measures.
ATTENTION: Disconnect the controller from the motor before measuring
insulation resistance (IR) of the motor windings. Voltages used for insulation
resistance testing can cause SCR failure. Do not make any measurements on
the controller with an IR tester (megger).
TIP The time it takes for the motor to come up to speed may differ from the time
programmed. This depends upon the motor and load characteristics.
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