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Altivar
®
58 TRX AC Drives
Type FVC Adjustment Parameters
71
09/2003
© 2000–2003 Schneider Electric All Rights Reserved
PID Regulator
This function is used to regulate a process with a reference and a feedback given by a sensor. A speed
input gives an initial (or predictive) setpoint for start-up. In PID regulator mode the ramps are linear, even
if they are configured differently. PID Regulator mode is active if an AI input is assigned to PID Feedback.
PID Regulator parameters:
• Speed Input: digital setpoint via communication link; analog input AI3.
• PID Setpoint: digital setpoint via communication link; 2 or 4 setpoints preset via logic input; analog
Input AI1 (± AI2 ± AI3).
• PID Feedback: analog input AI2 or AI3.
• Manual Setpoint (speed regulation mode): analog input AI3.
• Integral shunting: logic input LI: integral shunted if LIx=1.
• Auto/manual:
— Logic input LI for switching operation to speed regulation (man) if LIx = 1, or PID regulation (auto)
if LIx = 0.
In automatic mode the following actions are possible:
— Adapt the setpoint input to the process feedback: GAIN (PrG) and OFFSET (rEO).
— Correct PID inversion.
— Adjust the proportional, integral, and derivative gain (RPG, RIG and RdG).
— Use the “alarm” on logic output if a threshold is exceeded (Max. feedback, Min. feedback, and
PID error).
— Assign an analog output for the PID setpoint, PID feedback, and PID error.
— Limit the action of the PID according to the speed, with an adjustable base and ratio:
— Apply a ramp to establish the action of the PID on starting (AC2) and stopping (dE2).
— The motor speed is limited between LSP and HSP and is displayed as a percentage.
Predictive
speed input
PID
setpoint
PrG
RPG
RIG
RdG
X
rEO
Offset
PID
feedback
Integral shunting
Low-pass filter
AC2
dE2
Run
command
PIC
X±1
PSr
Multiplier
ACC
dEC
Linear ramp
Manual setpoint
ACC
dEC
Auto / man
Multiplier
Auto
Man
Reference
PID
reversal
Deadband
f (speed)
Ramp
++
+Ð
PLr
PLb
+
+
PSP PAH
PAL
Min / max
alarm
PEr
PID
regulator
Error alarm
Ramp
PID diagram.eps
Speed
Deadband