Schneider Electric 58 TRX manual PID Regulator

Altivar® 58 TRX AC Drives

Type FVC Adjustment Parameters

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.

Predictive speed input

	PSr		ACC
			dEC	Error alarm
Multiplier
		Linear ramp

PEr

PID diagram.eps

					PID
PID					regulator
setpoint	+	+			RPG
	PrG				RIG	X
	Multiplier	+	Ð		RdG
		rEO				AC2
		Offset			Ramp
						dE2
PID						Run
feedback	PSP			PAH
				PAL	command
Low-pass filter			Min / max
				alarm
Integral shunting

PLr	PIC	+
PLb	X±1
Deadband	PID
f (speed)	reversal

Auto

Man

+

Reference

Manual setpoint
	ACC
	dEC
	Ramp
Auto / man

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:

Speed

Deadband

—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.

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