36 Rockwell Automation Publication 750-UM003D-EN-P - March 2017
Chapter 3 Verify Operation
Short Circuit Functional Proof Test
To perform the PTC device short circuit functional proof test, follow these
steps.
1. Close SW1.
2. Open SW2.
3. Run the drive.
4. Close SW2.
If the system is working correctly, the drive faults due to a motor
over-temperature event detection.
5. If a safety option is present, check parameter 933 [Start Inhibits] and
verify that bit 2 [Enabled] and bit 7 [Safety] are set to high.
Functional Proof Testing
without a Test Fixture
To test the ATEX safety function without a test fixture, follow these steps.
1. Wire the ATEX daughter card to the thermal sensor in the motor.
2. Power up the drive.
3. Verify that no faults exist.
4. Remove power from the drive and verify that the voltage on the bus
capacitors has discharged.
5. Unplug the ATEX terminal plug from the ATEX daughter board.
ATTENTION: To avoid an electric shock hazard, verify that the voltage on the
bus capacitors has discharged completely before performing any service.
Frames 1…7: Measure the DC bus voltage at the power terminal block by
measuring between the +DC and -DC terminals or between the +DC and -DC
test points if equipped. Also measure between the +DC terminal or test point
and the chassis and between the -DC terminal or test point and the chassis. The
voltage must be zero for all three measurements.
Frames 8…12: Measure the DC bus voltage at the DC+ and DC- test point
sockets on the front of the power module.
For the location of the terminal block and test point sockets, see the manual for
your drive:
• PowerFlex 750-Series AC Drives Installation Instructions,
publication 750-IN001
• PowerFlex 750-Series Products with TotalFORCE Control Installation
Instructions, publication 750-IN100
• PowerFlex 755TM IP00 Open Type Kits Installation Instructions,
publication 750-IN101
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