User guide

54
NOTE 1: 240/120 Vac units have the same limits as 240/200 Vac units.
NOTE 2: The parameter value can be set below the minimum value shown, but the value shown is the
operationallimit ofthedrive.Forexample, ifDECEL isset for0.1seconds ona 10HP drivewithout
dynamicbraking,theactualdecelerationtimewouldbe0.3seconds.
 Ifanattemptismadetodecelerateahigh-inertialoadtooquickly,themotorwillregeneratevoltageback
into the drive. This will cause the DC bus voltage to rise, which can result in a HI VOLTS fault. In order
to prevent faulting, the drive will enter DECEL FREEZE, which halts the deceleration until the DC bus
voltage returns to a normal level. The drive will then begin to decelerate again, and if necessary, will enter
DECEL FREEZE repeatedly to avoid faulting. If a very short deceleration time is programmed, DECEL
FREEZE may not be able to compensate fast enough, resulting in a HI VOLTS fault.
 Inapplicationswhereveryshortdecelerationtimesarerequiredonhigh-inertialoads,dynamicbrakingmay
berequired.ConsultthefactoryformoreinformationontheDynamicBrakingoption.
10 MIN FRQ (MINIMUMFREQUENCY)
 Thisparameterdefinesthelowerlimitofthedrive’sspeedrange.MINFRQisusedinconjunctionwith
MAXFRQ(Parameter11below)todefinetheoperatingrangeofthedrive.
 If MIN FRQ is set to a value above 0.0 Hz, the drive will ramp up from 0.0 Hz when given a start
command. Once running, however, the drive will not operate below the MIN FRQ setting unless the
rotation is changed, or a stop command is issued and the drive is programmed to ramp to a stop.
 IftheMINIMUM FREQUENCYis setto 0.0Hz, thedrive maybe operatedin ZEROSPEEDmode
(drive isinRUNstate, but there is no outputtothemotor). ZERO SPEED operation can be usedin
applicationsrequiringtheabilitytostartandstopthedriveusingonlytheselectedspeedreference.Thedrive
will start when the speed reference is raised above 0 VDC or 4 mA, and it will stop when the reference is
lowered to 0 VDC or 4 mA. Note that the drive must be initially started using one of the normal start commands
(keypadorterminalstrip).
DECELERATION LIMITS
HORSEPOWER/VOLTAGE RATING DECEL RANGE
240/200 Vac
480/400 Vac 590/480 Vac WITHOUT DB
MODELS
MODELS MODELS (NOTE 2)
WITH DB
(NOTE 1)
0.25 - 7.5 HP 1 - 7.5 HP N/A 0.3 - 3600 SEC 0.1 - 3600 SEC
10 - 15 HP 10 - 20 HP 1 - 7.5 HP 0.5 - 3600 SEC 0.1 - 3600 SEC
20 - 30 HP 25 - 60 HP 10 - 20 HP 1.0 - 3600 SEC 0.2 - 3600 SEC
N/A N/A 25 - 60 HP 2.0 - 3600 SEC 0.2 - 3600 SEC
N/A 75 HP N/A 3.0 - 3600 SEC 0.8 - 3600 SEC
N/A 100 - 150 HP N/A 7.0 - 3600 SEC 1.8 - 3600 SEC