Schneider Electric ALTIVAR 58 TRX Guía de instalación descargar pdf (Pagina 76)

Chapter 2—Menus VVDED397047USR6/03

5—I/O Menu 06/2003

Assignment of AI2 and AI3

Summing Speed Reference: The frequency setpoints given by AI2

and AI3 can be summed with AI1.

Speed Regulation with Tachogenerator: (Assignment on AI3 only

with an I/O extension card, VW3A58201U)

An external divider bridge is required to adapt the voltage of the

tachogenerator. The maximum voltage must be between 5 and 9 V. A

precise setting is then obtained by setting the dtS parameter available

in the 2—Adjust menu.

PTC Probe Processing: (only with an I/O extension card using the

analog input). Used for direct thermal protection of the motor by

connecting the PTC probes in the motor windings to analog input AI3.

Preset

setpoints

Pr2, Pr4

PI2, PI3

0–100% of

process

maximum

(HSP)

Logic inputs can also be used to provide programmable setpoints.

Two or four preset setpoints require the use of one or two logic

inputs respectively.

For example, the factory settings of PI2 and PI3 are 30% and 60%

respectively and if HSP is 60 Hz, PI2 setpoint will be 18 Hz and PI3

setpoint will be 36 Hz.

PI Inversion PIC Yes/No

PI inversion permits an inverted, or

reverse-acting, response to the

setpoint signal. If PIC = No, the motor speed increases when the

error is positive. If PIC = Yes, the motor speed decreases when the

error is positive.

PI proportional

gain

rPG 0.01–100

PI regulator proportional gain adjusts the scaling of the

PI setpoint

signal.

PI integral gain rlG 0.01–100 s PI regulator integral gain adjustment.

Time-constant

feedback filter

PSP 0–10 s

PSP can be used to dampen the feedback signal. If PSP is set to

zero, the ACC and dEC ramps are active. If PSP is > 0, the

AC2/dE2 ramps are active. Adjustment of AC2/dE2 can be used to

refine the response of the PI loop. The dEC ramp is always used on

stopping.

PI feedback

scaling

FbS 1.0–100

PI feedback scaling allows adjustment of the maximum value of the

PI feedback signal so that it corresponds to the maximum value of

the PI regulator speed reference.

Table 20: Definition of PI Regulator Inputs and Adjustments (continued)

Input Code Range Description

2 preset setpoints 4 preset setpoints

Assign: LIx to Pr2 Assign: LIx to Pr2, then LIy to Pr4

LIx Reference LIy LIx Reference

Analog reference

Process max. (HSP)

Analog reference

PI2 (adjustable)

PI3 (adjustable)

Process max. (HSP)

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 125 126

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Schneider Electric ALTIVAR 58 TRX Guía de instalación Pagina 76

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