Commissioning procedure – Rockwell Automation 2500 CENTERLINE Motor Control Centers Installation Manual User Manual
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Rockwell Automation Publication 2500-IN001C-EN-P - April 2014
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Commissioning
Chapter 7
22.
Conduct an electrical insulation resistance test to verify MCC wiring
integrity. Conduct this test with an insulation resistance (megger) tester
with a potential of 500…1000 volts.
Conduct this megger test phase-to-phase, phase-to-PE and, when
applicable, phase-to-neutral on the MCC buswork. Typical insulation
resistance values are 50 megohms or greater.
Insulation resistance values are affected by temperature, humidity, or
dampness, which can cause a considerably lower insulation resistance
reading. If the insulation resistance values are less than one megohm (due
to dampness, temperature or humidity) or the MCC has been stored in a
damp or humid area, it is recommended the equipment be dried out. Dry
out motor cables by injecting a low voltage current or by using space
heaters.
Once the equipment is dry, repeat the insulation resistance test. The
minimum value for insulation resistance on a new installation at startup or
energizing is 1 megohm. These readings can be recorded in
on
Next, check the field wiring, for example, motor cables and/or incoming
line cables.
Commissioning Procedure
Read this procedure in its entirety before beginning the commissioning
procedure. If you have any questions or concerns, contact your Rockwell
Automation representative.
1.
Review other instructions supplied for the proper operation of special
units such as AC drives and soft starters, with appropriate and skilled
personnel.
2.
Verify that main and unit main switches are in the OFF/O position so
there is no load on the MCC.
Also, verify that associated remote devices are de-energized.
3.
Latch doors and secure covers.
ATTENTION: Verify all switches or circuit breakers are in the OPEN/I or
Off/O positions before conducting an electrical resistance test.
ATTENTION: Commissioning a motor control center must be done only by
skilled personnel with proper personal protective equipment. Energizing a MCC
for the first time is potentially dangerous. Serious damage and/or personal
injury can occur. Follow local codes and guidelines in addition to the
requirements of EN 50110.
ATTENTION: This procedure is provided as a general guideline for energizing a
newly installed CENTERLINE 2500 MCC and should be used only after the
Pre-commissioning Checklist has been completed.