Figure 1 – Rockwell Automation 20A PowerFlex 70EC/700VC User Manual
Page 24
20
Bus Regulation
Figure 1 Bus Voltage Regulator, Current Limit and Frequency Ramp.
Bus Voltage Regulator
Current Limit
Magnitude
Calculator
Frequency
Ramp
(Integrator)
Frequency
Limits
Current Limit Level
U Phase Motor Current
W Phase Motor Current
Propor
tional Channel
Frequency
Reference
Acc/Dec Rate
Integ
ral Channel
Bus Reg
I Limit,
No Bus Reg
Propor
tional Channel
I Limit,
No Bus Reg
Maximum Frequency, Minimum Speed, Maximum Speed, Overspeed Limit
Frequency Set Point
+
+
+
+
+
Output Frequency
Frequency Reference (to Ramp Control, Speed Ref, etc.)
Speed Control (Slip Comp, Process PI, etc)
Bus Voltage Regulation Point, Vreg
Bus Reg On
Bus Voltage (Vbus)
PI Gain Block
Speed
Control
Mode
0
No Limit
Limit
SW 1
SW 2
SW 3
SW 4
SW 5
Derivative
Gain Block
Jerk
Ramp
Jerk
Clamp
No Limit
PI Gain Block
Derivative Gain
Block
Integ
ral Channel
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