Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 299)

Rockwell Automation Publication 20P-UM001I-EN-P - February 2013 299
Application Notes Appendix C
Sum Mode
Sum mode is selected when Par 241 [Spd Torq Mode Sel] is set to 5 “Sum”. In this
mode, the reference is derived from the sum of the speed regulator output (Par
236 [Spd Reg Out Pct]) and the torque reference (Par 39 [Torque Ref ]). This
mode can be used for applications that have precise speed changes with critical
time constraints.
Torque Mode Selection Status Bits
Bits 7 “Forced Spd”, 8 “Speed Mode”, and 9 “Torque Mode” of parameter 382
[Drive Status 2] display the current status of the speed/torque mode for the drive.
(1) 3 “SLAT Min”
(2) 4 “SLAT Max”
Note: When Par 241 [Spd Trq Mode Sel] is changed to 1 “Speed Reg”, the speed
regulator integrator is preloaded with the value of Par 14 [Selected Torque Ref ].
When Par 241 [Spd Trq Mode] is changed to 5 “Sum”, the speed regulator is
preloaded with the value of Par 14 [Selected Torq Ref ] - Par 39 [Torque Ref ]
(Par 14 - Par 39).
Par 241
[Spd Trq Mode Sel] Par 382 [Drive Status 2]
Bit 7 “Forced Spd
Bit 8 “Speed Mode” Bit 9 “Torque Mode” (1)
(1) b9 = not(b7 + b8), if b7=1 & b8=0, then b9=0.
0 “Zero Trq Ref” 0 0 1
1 “Speed Reg” 0 1 0
2 “Torque Reg” 0 0 1
3 “SLAT Min” (1)
4 “SLAT Max” (2)
5 “Sum” 0 1 1
Bit 7 “Forced Spd 0 Not in Forced Speed Mode (FSM)
0 -> 1 Speed error < 0 (i.e., Feedback > Reference), preload the speed regulator
integrator with the value of Par 14 [Selected Torque Ref]
1 Forced Speed Mode (FSM), speed error < 0
1 -> 0 Error (i.e., Reference - Feedback) > Par 15 [SLAT Err Stpt] for more than the value of
Par 16 [SLAT Dwell Time]
Bit 8 “Speed Mode” 0 Par 236 [Spd Reg Pct Out] > Par 39 [Torque Ref]
1 Par 236 [Spd Reg Pct Out] < Par 39 [Torque Ref]
Bit 7 “Forced Spd 0 Not in Forced Speed Mode (FSM)
0 -> 1 Speed error > 0 (i.e., Feedback < Reference), preload the speed regulator
integrator with the value of Par 14 [Selected Torque Ref]
1 Forced Speed Mode (FSM), speed error > 0
1 -> 0 Error (i.e., Reference - Feedback) < -Par 15 [SLAT Err Stpt] for more than the value
of Par 16 [SLAT Dwell Time]
Bit 8 “Speed Mode” 0 Par 236 [Spd Reg Pct Out] < Par 39 [Torque Ref]
1 Par 236 [Spd Reg Pct Out] > Par 39 [Torque Ref]
b7 b8 +
( )
b7 b8
+
( )