User guide

18 BASE (BASEFREQUENCY)
 The BASE FREQUENCY determine the V/Hz ratio by setting the frequency at which the drive will
output full voltage to the motor. For most applications the base frequency should be set to match the
motor’sratedfrequency.
 Forexample,ifthedriveisratedfor460VACoutput,andtheBASEFREQUENCYissetto60Hz,the
drivewillmaintainaconstantratioof7.66V/Hz(exceptwhenACBOOSTorFXBOOSTareactive,see
Parameters19and20)from0Hzto60Hz.Thisrangeistheregionofconstanttorque.Ifthemotorspeed
isincreasedpast60Hz,theoutputvoltageremainsconstantwhilethefrequencyincreases,resultingina
reducedV/Hzratio.Thisrange,from60Hztoabout90Hz,istheregionofconstanthorsepower.Above
90Hz,horsepowerbeginstodecreaseasfrequencyincreases.RefertoSection6.1-DESCRIPTIONOF
AC MOTOR OPERATION.
19 FX BOOST (FIXEDBOOST)
 Thisparameterisusedinapplicationswhichrequirehighstartingtorque.FXBOOSTincreasestheoutput
voltageatloweroutputfrequencies(below30Hzfor60Hzbasefrequency),inordertoboostthetorque
capability of the motor. Refer to the diagram below. The factory default for FX BOOST depends on the
horsepower rating. Refer to the table below:
58
FX BOOST FACTORY DEFAULT SETTINGS
HP
FACTORY DEFAULT
HP
FACTORY DEFAULT FACTORY DEFAULT
(ALL VOLTAGES) (240 / 200 VAC) (400+ VAC)
0.25 - 1 HP 5.30% 40 HP — 1.20%
1.5 - 2 HP 4.40% 50 HP — 0.80%
3 HP 3.60% 60 HP — 0.80%
5 HP 3.00% 75 HP — 2.00%
7.5 HP 2.70% 100 HP — 1.90%
10 HP 2.40% 125 HP — 1.90%
15 HP 2.20% 150 HP — 1.80%
20 HP 2.00%
25 HP 1.80%
30 PH 1.60%