Schneider Electric ALTIVAR 58 TRX Guia de Instalação descarregar pdf (Página 74)

Chapter 2—Menus VVDED397047USR6/03

5—I/O Menu 06/2003

Using the Analog Inputs

The AI1 input is set for speed reference unless the PI Regulator

function is enabled. In this case, AI1 is used for the set point

reference. The possible assignments of AI2 and AI3 are Speed

Reference Summing and PI Regulator.

Speed Reference Summing

The frequency references at AI2 and AI3 can be summed with that at

AI1.

PI Regulator

This function is used to regulate a process with a setpoint input and a

feedback signal from the process. The function is enabled by

assigning an analog input (AI) to PI feedback in the 5—I/O menu after

first ensuring that the Auto/Manual (RFC) parameter is not assigned

to a logic input. This function is only available in the Variable Torque

Macro. The acceleration (ACC) and deceleration (dEC) ramps default

to linear ramp type even if the ramps had been configured for S ramp

or U ramp with the rPt parameter.

When the PI regulator is configured and a logic input is configured for

PAU: PI Auto/manual, the PI regulator function is active in Auto mode

and AI3 is used for speed input in manual mode. To use the PI

Auto/Manual function, you must install an analog option card,

VW3A58201U.

Logic inputs can be used with the PI regulator to command the drive

controller to run from the analog reference, run at process maximum,

or operate with two other definable pre-set setpoints. The

configurable setpoints can be used to provide two different setpoints

for two different processes, or they can be used instead of using AI1

for setpoint input. For example, providing a setpoint via the logic

inputs can eliminate the need for a potentiometer.

Four analog outputs are available to monitor various aspects of the PI

regulator function. See pages 83–84 for more information.

Figure 18 shows a diagram of the PI Regulator inputs, calculation

points, and outputs.

PI setpoint OPS PI feedback OPF

PI error OPE PI integral error OPI

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Schneider Electric ALTIVAR 58 TRX Guia de Instalação Página 74