Schneider Electric Altivar 32 Manuel d'installation télécharger pdf (Page 251)

Configuration Mode (ConF)

S1A28692 03/2010 251

Parameters described in this page can be accessed by:

Process underload detected fault

A process underload is detected when the next event occurs and remains pending for a minimum time

[Unld Time Detect.] (ULt), which is configurable:

• The motor is in steady state and the torque is below the set underload limit ([Unld. Thr. 0. Speed.] (LUL),

[Unld. Thr. Nom. Speed.]

(LUn), [Unld. Freq. Thr. Det.] (rMUd) parameters).

• The motor is in steady state when the offset between the frequency reference and motor frequency falls

below the configurable threshold [Hysteresis Freq. Att.] (Srb).

Between zero frequency and the rated frequency,

the curve reflects the following equation:

torque = LUL +

The underload function is not active for

frequencies below

[Unld. Freq. Thr. Det.] (rMUd).

A relay or a logic output can be assigned to the signaling of this detected fault in the

[INPUTS / OUTPUTS CFG] (I_O-) menu.

LUL

LUn

rMUd

FrS

Frequency

Torque as a % of

the rated torque

Underload

zone

(LUn - LUL) x (frequency)

(rated frequency)

Code Name / Description Adjustment range Factory setting

FLt- [FAULT MANAGEMENT] (continued)

ULd- [PROCESS UNDERLOAD]

ULt [Unld T. Del. Detect.]

0 to 100 s 0 s

Underload detection time delay.

A value of 0 deactivates the function and makes the other parameters inaccessible.

LUn [Unld. Thr. Nom. Speed.]

20 to 100% 60%

Underload threshold at rated motor frequency ([Rated motor freq.] (FrS) page 74), as a % of the rated motor torque.

LUL [Unld. Thr. 0. Speed.]

0 to [Unld.Thr.Nom.Speed]

(LUn)

Underload threshold at zero frequency, as a % of the rated motor torque.

rMUd [Unld. Freq. Thr. Det.]

0 to 599 Hz 0 Hz

Minimum frequency underload detection threshold.

Srb [Hysteresis Freq. Att.]

0.3 to 599 Hz 0.3 Hz

Maximum deviation between the frequency reference and the motor frequency, which defines steady state operation.

DRI- > CONF > FULL > FLT- > ULD-

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 251

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