Rockwell Automation 20D PowerFlex 700S with Phase I Control Reference Manual - Manual (Page 155)

Rockwell Automation Publication PFLEX-RM002D-EN-E - August 2013 155
Detail Drive Configuration and Operation Chapter 1
Zero Torque Mode
Operation in zero torque mode allows the motor to be fully fluxed and ready to
rotate when a speed command or torque command is given. This mode can be
used for a cyclical application where through put is a high priority. The control
logic can select zero torque during the “rest” portion of a machine cycle instead of
stopping the drive. When the cycle start occurs, instead of issuing a start to the
drive, a speed regulate mode can be selected. The drive will then immediately
accelerate the motor without the need for “flux up” time.
Note: Zero Torque may excessively heat the motor if operated in this mode for
extended periods of time. No load or flux current is still present when the drive is
operating in zero torque mode. A motor with an extended speed range or separate
cooling methods (blower) may be required.
Absolute Min Mode
Absolute Min Mode selects the smallest absolute algebraic value to regulate to
when the torque reference and torque generated from the speed regulator are
compared.
Start Inhibits This section covers Start Inhibits, parameter 156 [Run Inhibit Stat]. This
parameter indicates the cause of no response to a start request.
Bit 0 Description
0 Drive is Faulted
1 No Enable signal present
2 Software Ramp Stop request present
3 Software Coast Stop request present
4 Software Current Limit Stop request present
5 Power Loss
6 Power EE prom error
7 Flash upgrade in progress
8 Start request present
9 Jog request present
10 Encoder PPR error
11 Bus Precharge not complete
12 Digital input configuration error
13 Motin Shtdwn
14 Permanent Magnet motor Feedback Error