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Functions (continued)

Altivar

variable speed drives

Ramp time switching

This function is used to switch two acceleration and deceleration ramp times,

which can be set separately.

Enabled by means of 1 assignable logic input.

It is suitable for machines with fast speed correction in steady state and high-speed

lathes with acceleration and deceleration limiting above certain speeds.

Acceleration and deceleration ramp proles

This function can be used to gradually increase the output frequency starting from a

speedreference,followingalinearproleorapresetprole.

v S ramps

The use of S ramps is dedicated to applications involving handling, packaging and

passengertransport;thismethodtakesupmechanicalbacklashandeliminatesjolts,

and also limits “non-following” of speed during rapid transient operation of high-

inertia machines.

v U ramps

The use of U ramps is dedicated to pump applications such as an installation with

centrifugal pump and non-return valve; this method enables valve closing to be

controlled more accurately.

Selecting“linear”,“S”,or“U”proleswillaffectboththeaccelerationand

deceleration ramps.

Automatic adaptation of deceleration ramp

This function is used to increase the deceleration time automatically if the initial

setting is too low when the load inertia is taken into account. It prevents the drive

locking on an “overvoltage on deceleration” fault.

If a braking unit is connected to the drive, this function must be disabled.

Stop types

Thisisusedtodenethedrivestopmode.

There are three stop types:

v Freewheel stop: When the drive is locked, the motor stops in freewheel mode

depending on the application; the motor power supply is cut.

v Stop on deceleration ramp: The motor stops according to the deceleration ramp

timewhichcanbexedoradaptable(seethe“Automaticadaptationofdeceleration

ramp” function).

v Fast stop: Braked stop with an acceptable deceleration ramp time (divided by a

coefcientwhichcanbesetbetween1and10)forthedrive/motorunitwithout

locking in the event of an “overvoltage on deceleration” fault.

Factory-setconguration:Stopon3sdecelerationrampwithautomaticadaptation.

Introduction:

page 8

Specications:

page 10

References:

page 14

Dimensions:

page 18

Connections:

page 22

f (Hz) f (Hz)

HSP

0 0t t

HSP: High speed

t1=k1xt2(k1:xedroundingcoefcient)

t2: Ramp time set

S ramps

f (Hz)

HSP

f (Hz)

HSP

t t

HSP: High speed

t1=k2xt2(k2:xedroundingcoefcient)

t2: Ramp time set

U ramps

1 Fast stop

2 Stop on deceleration ramp

3 Freewheel stop

123

f (Hz)

Stop types

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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