Schneider Electric Altivar 32 Manuel d'installation télécharger pdf (Page 193)

Configuration Mode (ConF)

S1A28692 03/2010 193

Scaling of feedback and references:

• [Min PID feedback] (PIF1), [Max PID feedback] (PIF2) parameters can be used to scale the PID

feedback (sensor range). This scale MUST be maintained for all other parameters.

• [Min PID reference] (PIP1), [Max PID reference] (PIP2) parameters can be used to scale the

adjustment range, for example the reference. The adjustment range MUST remain within the sensor

range.

The maximum value of the scaling parameters is 32,767. To facilitate installation, we recommend using values

as close as possible to this maximum level, while retaining powers of 10 in relation to the actual values.

Example (see graph below): Adjustment of the volume in a tank, between 6 m

and 15 m

• Sensor used 4-20 mA, 4.5 m

for 4 mA and 20 m

for 20 mA, with the result that PIF1 = 4,500 and

PIF2 = 20,000.

• Adjustment range 6 to 15 m

, with the result that PIP1 = 6,000 (min. reference) and PIP2 = 15,000

(max. reference).

• Example references:

- rP1 (internal reference) = 9,500

- rP2 (preset reference) = 6,500

- rP3 (preset reference) = 8,000

- rP4 (preset reference) = 11,200

The [3.4 DISPLAY CONFIG.] menu can be used to customize the name of the unit displayed and its format.

Other parameters:

• [PID wake up thresh.] (rSL) parameter: Can be used to set the PID error threshold, above which the

PID regulator will be reactivated (wake-up) after a stop due to the max. time threshold being exceeded at

low speed [Low speed time out] (tLS).

• Reversal of the direction of correction [PID correct. reverse] (PIC): If [PID correct. reverse] (PIC) is

set to [No] (nO), the speed of the motor will increase when the error is positive (for example: pressure

control with a compressor). If [PID correct. reverse] (PIC) is set to [Yes] (YES), the speed of the motor

will decrease when the error is positive (for example: temperature control using a cooling fan).

• The integral gain may be short-circuited by a logic input.

• An alarm on the PID feedback may be configured and indicated by a logic output.

• An alarm on the PID error may be configured and indicated by a logic output.

PID feedback

Adjustment range

(reference)

PIP2 (15,000)

PIP1 (6,000)

PIF1

(4,500)

PIF2

(20,000)

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

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Schneider Electric Altivar 32 Manuel d'installation Page 193

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