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Functions (continued)

Altivar

variable speed drives

Limiting low speed operating time

The motor is stopped automatically after a period of operation at low speed (LSP).

This time can be set between 0.1 and 999 seconds (0 corresponds to an unlimited

time).

The motor restarts automatically on a ramp when the reference reappears.

This function is suitable for automatic stops/starts, especially in pump applications.

Conguration of analog input AI1

Thisisusedtomodifythespecications,foreithervoltageorcurrent,ofanaloginput

AI1.

Factory-setconguration:0-5V(internalpowersupply).

Other possible values via external power supply: 0-10 V, X-Y mA by programming X

and Y with 0 to 20 mA.

Automatic restart

This function enables the drive to be restarted automatically after it has locked in

fault mode, provided the relevant fault has disappeared and the other operating

conditions permit a restart.

This restart is performed by a series of automatic attempts separated by increasingly

long waiting periods of 1 s, 5 s, 10 s, then 1 min for subsequent periods.

If the drive has not restarted after 6 minutes, it locks and the procedure is abandoned

until the drive is powered down and back up again.

Factory-setconguration:Functioninactive.

Restarting is permitted with the following faults:

v Drive thermal overload

v Motor thermal overload

v Line overvoltage

v Overvoltage during deceleration

v Motor overload

v Motor underload

v Output phase loss

v Input phase loss (1)

v Line undervoltage (2)

v Modbus serial link

For this type of fault, the fault relay remains activated if the function has been

congured.

This function requires the speed reference and the direction of operation to be

maintained, and is only compatible with 2-wire level control.

This function is suitable for machines or installations which are in continuous

operation or are not monitored, and where a restart will not endanger equipment or

personnel in any way.

Automatic catching of a spinning load with speed detection (“catch on the y”)

Used to restart the motor smoothly after one of the following events:

v Loss of line supply or power off

v Fault reset or automatic restart

v Freewheel stop

Once the event is over, the actual motor speed is detected in order to restart on a

ramp at this speed and return to the reference speed. The speed detection time can

be up to 1 s (typical value) depending on the initial deviation.

Factory-setconguration:Functioninactive.

Thisfunctionrequiresthe“automaticDCinjectionbraking”functiontobedisabled.

This function is suitable for machines for which the loss of motor speed is negligible

during the power failure (machines with high inertia).

(1) The “input phase loss” fault is only accessible on drives with a three-phase power supply,

if monitoring of the fault has been enabled (factory-set conguration: enabled).

(2) The drive will restart as soon as the “undervoltage” fault disappears, regardless of whether

the function is active.

Introduction:

page 8

Specications:

page 10

References:

page 14

Dimensions:

page 18

Connections:

page 22

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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