Rockwell Automation Publication 750-QS100B-EN-P - August 2020 13
Step 2: Validate the Drive Installation
Verify Power Source Ratings and Wiring Configurations
The installation must conform with the guidelines that are given in the PowerFlex 750-Series Products with
TotalFORCE Control Installation Instructions, publication 750-IN100
.
If any of the following conditions exist, confirm that these items have been addressed and that the power source and
cabling is suitable for operation of the PowerFlex 755TL/TR drives.
• The power-source-short-circuit-current capacity must not exceed 100,000 A rms symmetrical amperes at 400/
480/600V systems, and 65,000 A rms symmetrical amperes for 690V systems.
• The PowerFlex 755TL/TR drives must not be used on undersized or high impedance supply systems. The supply
system kVA must be equal to or greater than the drive kW, and the system impedance must be less than 10%.
• Other drives share the AC input source transformer with the PowerFlex 755TL/TR drive, certain measures may
be required for proper operation of the PowerFlex 755TL/TR drive.
• The power source grounding method is not the recommended wye secondary with solid (low resistance) X0
ground with cable that is connected to the drive PE terminal. DC bus conditioning filters and other devices may
be required.
• The motor output cable length is greater than the recommendations in Appendix A of the Wiring and Grounding
for Pulse Width Modulated (PWM) AC Drives, publication DRIVES-IN001
. When assessing the motor output
cable length in comparison to the recommendations, consider the following:
– Motor insulation rating
– PWM switching frequency
– Any reflected wave protection devices, such as an RWR filter, if any such devices have been installed
See the Wiring and Grounding for Pulse Width Modulated (PWM) AC Drives, publication DRIVES-IN001
, for
important information regarding installation of AC drives.
Verify Power Wiring
Visually inspect the power wiring connections to each drive. Be sure that you are satisfied that the correct wires are
connected to the input terminals and to the output terminals and are tightened with the correct torque.
See the PowerFlex 750-Series Products with TotalFORCE Control Installation Instructions, publication 750-IN100
for
more information on where these connections are made and torque requirements.
See the Wiring and Grounding for Pulse Width Modulated (PWM) AC Drives, publication DRIVES-IN001
, for
important information regarding installation of AC drives.
Verify Wiring Drive 1
Wiring is Correct
Drive 2
Wiring is Correct
Drive 3
Wiring is Correct
Drive 4
Wiring is Correct
Drive 5
Wiring is Correct
AC input power is on L1, L2, L3 / R, S, T. ❑❑ ❑❑❑
Output motor connection is on T1, T2, T3 / U, V, W. ❑❑ ❑❑❑
Proper ground wire terminations at PE ground studs. ❑❑ ❑❑❑
The motor output cable length does not exceed the max
recommended length.
❑❑ ❑❑❑
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