116 Rockwell Automation Publication 750-PM101B-EN-P - April 2022
Chapter 4 Troubleshooting
PowerFlex 755T Lifting/
Torque Proving
Review the Attention statement that follows if you intend to use the
TorqProve™ feature without an encoder.
For information on TorqProve applications, see the PowerFlex 750-Series with
TotalFORCE Control reference manual, publication 750-RM100
.
ATTENTION: You must read the following information before you can use
TorqProve with no encoder.
Encoderless TorqProve must be limited to lifting applications where
personal safety is not a concern. Encoders offer additional protection and
must be used where personal safety is a concern. Encoderless TorqProve
cannot hold a load at zero speed without a mechanical brake and does not
offer additional protection if the brake slips/fails. Loss of control in
suspended load applications can cause personal injury and/or equipment
damage.
It is your responsibility to configure drive parameters, test any lifting
functionality, and meet safety requirements in accordance with all
applicable codes and standards. If encoderless TorqProve is desired, you
must certify the safety of the application. To acknowledge that you have
read this ‘Attention’ and properly certified the encoderless application, set
bit 3 ‘EnclsTrqProv’ of parameter 10:420 [Mtr Options Cfg] to a value of 1.
This action removes Alarm 9014 ‘TP Encls Config’ and allows bit 1
‘Encoderless’ of parameter 9:50 [Trq Prove Cfg] to be changed to 1 enabling
encoderless TorqProve.
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