User guide

Example:Thecriticalfrequencyis21Hz,andabandwidthof2Hzisdesired.Therefore,setSKIP#1to20

HzandsetSKIPBANDWIDTHto2Hz.Thisresultsinaspeedrangefrom20Hzto22Hzthatthedrive

willnotoperatewithincontinuously.Ifthedrivewereoperatingat25Hzandthencommandedtooperate

ataspeedwithintherangeofavoidance,thedrivewoulddecelerateto22Hzandremainatthatfrequency

untilcommandedto20Hzorbelow.Thedrivewouldthendeceleratethroughtherangeofavoidanceto

thenewfrequency.Likewise,ifthedrivewereoperatingat18Hz,andthencommandedtooperateata

speedwithintherangeofavoidance,thedrivewouldaccelerateto20Hzandremainatthatfrequencyuntil

commandedtoaspeedof22Hzorabove.Thedrivewouldthenacceleratethroughtherangeofavoidance

tothenewfrequency.

8 ACCEL (ACCELERATIONTIME)

 ACCEL sets the acceleration rate for all speed reference sources (keypad, speed pot, 4-20 mA, 0-10

VDC,jog,andthepresetspeeds).TheACCELsettingisthetimetoacceleratefrom0HztotheBASE

FREQUENCY(Parameter18).TherangeofadjustmentforACCELdependsonhorsepower.Refertothe

table below:

Example:IfACCELissetto30seconds,andtheBASEFREQUENCYissetfor60Hz,thedrivewillramp

from0Hzto60Hzin30seconds.Thisisalinearfunction,thereforethedrivewouldrampupto30Hz

in 15 seconds, etc.

NOTE: The ability to accelerate a given load at a particular rate will be limited by the output power

capability of the drive/motor combination. The acceleration of high-inertia and high-friction loads may

be affected by the current limiting characteristics of the drive. See Parameters: 16 - CURRENT, 19 - FX

BOOST, and 20 - AC BOOST for more information.

9 DECEL (DECELERATIONTIME)

This parameter sets the deceleration rate for all speed reference sources. The DECEL setting indicates time

todeceleratefromBASEFREQUENCYto0Hz.AswithParameter8-ACCEL,thisisalinearfunction.

If the drive is set to COAST to stop, this parameter will have no effect when a STOP command is given.

 TherangeofadjustmentforDECELdependsonthehorsepowerandvoltagerating,andwhetherDynamic

Brakingisbeingused.Refertothetableonnextpage:

ACCELERATION LIMITS

120 - 240 Vac 400 - 590 Vac RANGE OF

MODELS MODELS ADJUSTMENT

0.25 - 20 HP 1 - 20 HP 0.1 - 3600 SEC

25 - 30 HP 25 - 60 HP 0.3 - 3600 SEC

— 75 - 150 HP 1.0 - 3600 SEC