Rockwell Automation Publication 750-IN119A-EN-P - April 2022 97
Chapter 6 Service and Maintenance
Start Up After Repairs
Before you place a drive back into operation, complete these instructions.
1. Measure the AC input voltage to verify that there is no voltage present
(See Three-phase Power Terminal Locations on page 65
):
• Measure the AC input terminals R/L1, S/L2, and T/L3, L to L and L to
chassis GND (PE).
2. Perform phase to ground resistance tests to verify that there are no
shorts on terminals R/L1, S/L2, and T/L3 to measure L to chassis GND
(PE).
3. If the measured value of any resistance test is less than 1 kOhm,
troubleshoot to find the short, correct the problem, and repeat step 2.
4. For any module or component that has been removed and re-installed,
complete the following:
• Verify that all hardware connections have been replaced and are
properly torqued.
• Verify that all interconnection wire harnesses are connected at both
ends and properly supported by cable ties along their entire length
where applicable.
5. When service has been completed on the control pod, verify that all
control power and I/O wires are connected and properly secured.
6. Continue with No-load DC Bus Voltage and Output Current
Measurements.
No-load DC Bus Voltage and
Output Current
Measurements
Follow theses steps to measure the DC bus voltage and output current and
diagnose problems without connecting the motor to its mechanical load.
1. Verify that the input power and ground wires are connected.
2. Verify that the AC line power at the disconnect device is within the rated
value for the drive or bus supply.
3. Verify that the control power voltage is correct.
4. Verify that the motor cables are connected.
5. Verify that the motor load is disconnected.
6. Energize the system.
7. Measure the DC bus voltage and verify that the measured value is
displayed in parameter 0:3 [DC Bus Volts].
8. Start the system and increase the speed from zero to base speed.
9. Measure the system output current and verif y that the measured value is
displayed in parameter 10:3 [Output Current].
10. Stop the system.
11. Reconnect the load to the motor before proceeding with drive startup.For
startup information see the PowerFlex® Drives with TotalFORCE™
Control Quick Start, publication 750-QS100
.
IMPORTANT It is recommended that you wait 5 minutes before cycling power
disconnect switches. This recommendation applies to both Off-
to-On and On-to-Off transitions. Rapid power cycling can result in
equipment damage.
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