Instruction Manual

7–52 Programming
Process PI
This group of parameters configures the Process PI Regulator.
[Speed Control]
Thisparameterselectsthetypeofspeedmodulationactive
in the drive.
This parameter cannot be changed while the drive is
running.
Important: If encoder feedback closed loop speed
regulation is required, “Encoder Fdbk” must be selected.
Parameter Number 77
Parameter Type Read and Write
Factory Default “No Control”
Units Display Drive
“No Control” 0 Frequency regulation
“Slip Comp” 1 Slip compensation
“Speed Droop” 2 Negative slip compensation
“Phase Lock” 3 Enable phase lock to pulse input
“Encoder Fdbk” 4 Encoder feedback-closed loop
“Droop + Reg” 5 Enc. fdbk.-closed loop w/ active
droop
“P Jump” 6 Traverse function
“Process PI” 7 Closed loop PI control
[PI Config]
Thisparametersets anddisplaystheconfigurationforthe
PI regulator.
Note: Reset Integrator (Int) is also available through a
digital input. See Input Mode Selection in Chapter 3 or 4.
Parameter Number 213
Parameter Type Read/Write
Factory Default 00000000
PI Reference
PI Reference
Select
pi reference
∑
∑
√
PI Config.sqrt_fdbk
PI Config.inv_error
PI Config.reset_int
PI Feedback
Freq Command
PI Error
Master Frequency Reference
Process KI
s
Process KP
Integral Term = 0
PI + Clamp
PI – Clamp
PI Output
Speed
Adder
Output Frequency
Speed
Command
Speed
Ramp
pi feedback
PI Feedback
Select
Compute
Speed
Accel
Control
+
–1
–
+
+
∑
PI Config.zero_clamp
speed ramp>0
+
+
PI Output
+32767
Parameter 65
–32767
–32767
+32767
0
0
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Inv Error - Changes sign of PI Error
Reset Int - Holds KI at zero
ZeroClamp-Preventsbidirectionaloperation
SqrtFdbk-Usessq.rootofPIfeedbackvalue
Set Output 0 0 0 0 1 1
Preload Int 0 0 1 1 0 0
PI Enable 0 1 0 1 0 1
Diagram 1 2 3
(Referto Diagramson nextpage)
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