Torque Reference - Allen-Bradley PowerFlex 70 Reference Manual

Torque Reference

Torque Reference
204
Figure 59 Flux Vector
Flux
Reg.
Speed
SPEED REF.
Reg.
TORQUE REF.
AUTOTUNE PARAMETERS
When the PowerFlex 700 Vector Control drive is operated in
FV
Vector
Torque mode, an external signal is used for a Torque reference. Refer to
Figure 60
Scale
Torque Ref A Sel
427
Scale
Torque Ref B Sel 431
Torque Reference Input
[Torque Ref A], parameter 427 is used to supply an external reference for how
much torque is desired. The scaling of this parameter is from –800 to +800, via
[Torq Ref A Hi] and [Torq Ref A Lo].
Torque Ref 1 is then divided by [Torq Ref A Div], parameter 430. This defines
the scaled Torque Ref A.
[Torque Ref B], parameter 431 is used to supply an external reference for how
much torque is desired. The scaling of this parameter is from –800 to +800, via
[Torq Ref B Hi] and [Torq Ref B Lo].
The Torque Ref B is then multiplied by [Torq Ref B Mul], parameter 434. This
defines the scaled Torque Ref B.
Once the scaling is complete on both Torque Ref A and Torque Ref B, the output
is summed to create the external torque reference
This can be utilized when a master/slave multi-drive system is configured. The
torque reference into the "slave" can be scaled to create the proper torque output.
Keep in mind that the motors may be different ratings and this function is used
to help the "system" share the load.
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
High Bandwidth Current Regulator
CURRENT FEEDBACK
V mag
Current
Voltage
Reg.
Control
V ang
SLIP
Adaptive
Controller
Ref A Hi
428
Ref A Lo
429
/
Torq Ref A Div
430
Ref B Hi
432
x
433
Ref B Lo
Torq Ref B Mult
434
Inverter Motor
Encoder
SPEED FEEDBACK
Figure 60.
+