Rockwell Automation 21G PowerFlex 750-Series AC Drives Programming Manual - Manual (Page 360)

360 Rockwell Automation Publication 750-PM001J-EN-P - October 2014
Chapter 6 Troubleshooting
PowerFlex 755 Lifting/
Torque Proving Review the Attention statement that follows if you intend to use the TorqProve™
feature without an encoder. TorqProve only applies to PowerFlex 755 drives.
For more information on TorqProve applications, refer to Appendix B .
External Brake Resistor
Figure 5 - External Brake Resistor Circuitry
This circuit is designed to remove input voltage to the drive in the event that the
line voltage is high and forcing dynamic braking to operate continuously.
ATTENTION: User must read the following prior to the use of 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 the responsibility of the engineer and/or user 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, the user must
certify the safety of the application. To acknowledge that the end user has read this
“Attention” and properly certified their encoderless application, bit 3
(“EnclsTrqProv”) of [Mtr Options Cfg], parameter 40 must be changed to a “1.” This
will remove Alarm 28, “TP Encls Config” and allow bit 1 of Parameter 1100 to be
changed to a “1” enabling encoderless TorqProve.
ATTENTION: The drive does not offer protection for externally mounted brake
resistors. A risk of fire exists if external braking resistors are not protected.
External resistor packages must be self-protected from over temperature or a
circuit equivalent to the one shown below must be supplied.
Power On
R (L1)
S (L2)
T (L3)
Power Source DB Resistor Thermostat
Power Off
M
M
(Input Contactor) M
Three-Phase
AC Input