Rockwell Automation 1512B MV Controllers, 200/400A Two-High Cabinet, Standard and Arc-Resistant Enclosure - Manual (Page 48)

40 Rockwell Automation Publication 1500-UM055G-EN-P - May 2013
Chapter 4 Common Installation
Insulation can be tested from phase to phase and from phase to ground. The
recommended level for AC Hi-Pot testing is (2 X V
LL
) volts, where V
LL
is the
rated line-to-line voltage of the power system. The leakage current must be less
than 20 mA. Record the result for future comparison testing.
If a Megger is used, it should indicate 50,000 megohms or greater if the unit is
isolated from the line and the motor. If the unit is connected to a motor, the
Megger should indicate 5,000 megohms or greater (phase to ground).
Start-up Procedure Contactor Inspection
See Publication 1502-UM050_-EN-P or 1502-UM052_EN-P for information on
pre-energization inspection, vacuum bottle integrity test and insulation resistance test.
Preliminary Checks
Verify the following:
• Contactor current and voltage ratings are correct for the attached load;
• Control voltage is correct;
• Settings for protective relays;
• Heater elements (if provided) in overload relay are secure and undamaged;
• Equipment grounding;
• External power and control connections match electrical diagrams;
• All hardware is correctly reinstalled and torqued to specifications (refer
to Recommended Torque Values on page 3 of Chapter 1 );
• All barriers are replaced to correct positions;
• All fuses are correct class, type and rating;
• Mechanical interlocks and isolation switch function properly;
• Ensure that any microprocessor-based protection relay is programmed;
• Interior of cabinet is free from dirt, loose bolts, tools or metal chips.
Vacuum clean if necessary;
• All tools are accounted for. If you cannot locate a tool, do not energize the
unit until it is found.
ATTENTION: Remove all primary fuses for the control power transformer and/
or the potential transformer. Failure to do so may cause damage to the
equipment during the Hi-Pot test.