Rockwell Automation 1560E SMC Flex Smart Motor Controller - Manual (Page 72)

3-4 Commissioning Procedures
1560E-UM050B-EN-P - June 2013
Hi-Pot and Megger Test
It is recommended that insulation levels be checked before energizing
power equipment. This may be done with a High Voltage AC insulation
tester (HI-POT) or a Megger. See Vacuum Contactor User Manual for
suggested HI-POT testers, and for test procedures for vacuum contactors.
If using a Megger, a 5000 volt type is recommended.
Solid-state devices can be destroyed by high voltage.
Use jumper wires between heatsinks to short out the
SCRs before applying high test voltages to the power
circuit. Disconnect the white wires (1L1, 1T1, 1L2,
1T2, 1L3, 1T3) from the voltage feedback board and
remove the plug connector. If voltage transformers are
present, remove one primary fuse from each device. On
the 1503E, consult OEM documentation for location of
voltage feedback board
Use caution when performing the HI-POT or Megger
Test. High voltage testing is potentially hazardous and
may cause severe burns, injury or death. Where appro-
priate, the case of the test equipment should be connected
to ground.
Insulation may be tested from phase to phase and 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
may be recorded for future comparison testing, and must be less than 20 mA.
If a Megger is used, it should indicate 50 k megohms or greater if it is
isolated as explained in the next paragraph. If the motor is connected, the
Megger should indicate 5 k megohms or greater.
If a 1560E is being tested, it is recommended that the input and output
cables be disconnected for each phase. If a 1562E is being tested, it is
recommended that the main contactor be in the open position, and that the
output cables be disconnected for each phase. (See points marked with an
asterisk * in Figure 3.1) This will ensure the unit is isolated from the line
and the motor. The line and the motor may be tested separately to locate
problem areas. If a 1503E is being tested, consult OEM documentation.
After completing the test, remove all semiconductor jumpers and test the
devices with a multimeter to ensure no damage has occurred from the
insulation test. Reconnect the system as it existed prior to this section.
Perform the power supply and resistance checks in the following sections.
Failure to reconnect all wires and cables correctly may
result in equipment damage, personal injury or death.
A T T E N T I O N A T T E N T I O N
A T T E N T I O N A T T E N T I O N
A T T E N T I O N A T T E N T I O N