Rockwell Automation Publication 750-RM100A-EN-P - August 2019 101
Chapter 11
Application References
PowerFlex 755T Lifting/
Torque Proving
TorqProve™ is a PowerFlex® 755T drive feature that is intended for applications
that require proper coordination between motor control and a mechanical brake.
Before releasing a mechanical brake, the drive checks motor output phase
continuity and verifies proper motor control (torque proving). The drive also
verifies that the mechanical brake has control of the load before releasing drive
control (brake proving). After the drive sets the brake, it monitors motor
movement to confirm that the brake can hold the load.
Overview
TorqProve can be operated encoderless or with an encoder. See the PowerFlex
Drives with TotalFORCE® Control Programming Manual, publication 750-
PM100 for detailed information.
TorqProve functionality with an encoder includes:
• Torque Proving (includes flux up and last torque measurement)
•Brake Proving
• Brake Slip (feature slowly lowers load if brake slips/fails)
• Float Capability (ability to hold full torque at zero speed)
•Micro positioning
•Fast Stop
• Speed Deviation Fault, Output Phase Loss Fault, Encoder Loss Fault.
Encoderless TorqProve functionality includes:
• Torque Proving (includes flux up and last torque measurement)
•Micro positioning
•Fast Stop
• Speed Deviation Fault, Output Phase Loss Fault
ATTENTION: Loss of control in suspended-load applications can cause personal
injury and/or equipment damage. The drive or a mechanical brake must always
control the loads. Parameters 9:60 [Brk Release Time]…78 [DI FloatMicroPsn]
are designed for lifting/torque prove applications. It is the responsibility of the
engineer and/or end user to configure drive parameters, test any lifting
functionality and meet safety requirements in accordance with all applicable
codes and standards.
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