Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) - Manual (Page 123)

Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013 113
Chapter
9
Troubleshooting
General Notes and Warnings For safety of maintenance personnel as well as others who might be exposed to
electrical hazards associated with maintenance activities, follow the local safety
related work practices (for example, the 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.
ATTENTION: Hazardous voltage is present in the motor circuit even when the
SMC Flex controller is off. To avoid shock hazard, disconnect main power before
working on the controller, motor, or control devices such as 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 be more or less than
the time programmed, depending on the frictional load and inertial
characteristics of the connected load.
TIP Depending on the application, the Braking options (SMB™ Motor Braking,
Accu-Stop and Slow Speed) may cause some vibration or noise during the
stopping cycle. This may be minimized by lowering the braking current
adjustment. If this is a concern in your application, please consult the factory
before implementing these options.
IMPORTANT For MV SMC Flex technical support on start-up or existing installations, contact your
Rockwell Automation representative. You can also call 1-519-740-4790 for
assistance Monday through Friday from 9:00 a.m. to 5:00 p.m. (Eastern time zone).