Rockwell Automation Publication 750-UM006C-EN-P - March 2022
175
Troubleshooting
Chapter 6
Safety Input: drive does not run.
See the electrical schematics for details on the Safety I/O
option module wiring.
Use the HIM, Connected Components Workbench
Software, DriveExecutive, or Studio 5000 Logix Designer
application to monitor the status of the safety option
module by reviewing
00:933 [Start Inhibit]
.
• All bits must be 0 for the drive to be able to run or jog.
• The safety option module controls the drive enable
and safety options. Their status is available in bits 2
and 7.
• If both bits are 0 the safety inputs are made and the
drive is able to run or jog.
• If the bit equals 1, the safety option module outputs
are disabled and will not allow the drive to Run or jog.
See the appropriate safety manual found in
for specific details on the option
module being used for enabling and disabling the drives
safety circuits.
Encoder Feedback
See the electrical schematics for details on the encoder
feedback wiring options.
Encoder Alarms and Faults are annunciated on the HIM.
The drive status is transmitted to the PLC via EtherNet/IP.
See the HIM manual found in the
for details on using the 20-HIM-C6S to view Faults
and alarm details.
See the programming manual found in the
for details on PowerFlex 755 faults
and alarms.
Circuit Breaker
A visual inspection can verify that the breakers are
individually opened or closed, or that the connections are
loose.
The 400/480V AC incoming power is provided to the main
rotary circuit breaker through the receptacle L123.
The mechanical brake circuit breaker (source brake circuit
breaker or 24V DC brake circuit breaker) and the control
power circuit breaker are located under the auxiliary
circuit breaker door.
Mechanical brake power is provided by the receptacle
L123 for source brake or receptacle CPBR for the 24V DC
brake. Control power is provided by the receptacle CP.
All three circuit breakers must be made with power
present for the drive to operate and control a motor and
the brakes properly.
Main input circuit breaker and the brake circuit breaker
have normally open (N.O.) contacts wired in series to
digital input '1' on the digital I/O module mounted in slot
7. See the electrical schematics for details.
When the 24V DC auxiliary control power is supplied to
the unit Receptacle 'CP', you can check the status of the
breakers using the HIM and by monitoring
07:01 [Dig In
Sts]
bit 1. If it is equal to '1' all breakers are closed/
energized. If it is '0' then one of the three breakers is
open/tripped.
For additional information on circuit breaker
troubleshooting, see
Circuit Breaker Troubleshooting on
.
(1) The PowerFlex 755 On-Machine™ Drive uses a PowerFlex Frame 2 drive. Any specific references to frame sizes other than Frame 2 in Chapter 6 of the programming manual should be ignored.
Issue
Description / Possible Cause
Action
