
100.210-IOM (FEB 2015)
Page 52
VYPER
™
VARIABLE SPEED DRIVE
OPERATION
Example 3
(See.Figures.58.and.59).What.are.the.high.Motor.
Amp.setpoints.if.a.700.hP.Vyper.is.to.drive.a.motor.with.
1.00.SF.and.a.679.Amp.FLA?.Using.these.values,.determine.
whether.Table.A.or.Table.B.should.be.used.to.calculate.the.
setpoints.
Motors.with.a.1.00.SF.need.to.be.derated.by.dividing.the.
Nameplate. FLA. by. 1.15. or. an. Applied. motor. FLA.. This. is.
calculated.as.shown:
679.Amps
= 590 Amps
1.15
Line
Parameter
Value
1
Applied.Motor.FLA
590.A
2
Applied.Service.Factor
1.15
3
Multiply.(Line.1.x.Line.2)
679.A.
4
hP.rating.of.Vyper.Drive
700.hP
5
Vyper.Amp.Limit.
If.Line.4.is.700/572.hP,.value.is.880.A.
If.Line.4.is.912/752.hP,.value.is.1180.A
880.A
6
Multiply.Line.5.x.1.05
924.A
Figure 58 - Ex. 3 motor Amps Safety Calculation Table
The.value.of.Line.3.is.679.Amps;.this.is.less.than.Line.6.Value.
of.924.Amps..Therefore,.use.Table.A.(Table.17).for.high.Motor.
Amp.setpoint.calculation..Refer.to.Figure.53.for.the.locations.
to.enter.calculated.values.
Table A - High Motor Amp Setpoint Calculations
Parameter
Equation
Value
Load.Inhibit
=Applied.Motor.FLA.x.1.1
747.A
Force.Unload
=Applied.Motor.FLA.x.1.12
760.A
Warning
=Applied.Motor.FLA.x.1.13
767.A
Shutdown
=Applied.Motor.FLA.x.1.15.
780.A
Figure 59 - Ex. 3 motor Amp Setpoint Calculations (Table A)
Example 4
(See.Figures.60.and.61).What.are.the.high.Motor.
Amp.setpoints.if.a.912.hP.Vyper
™
.is.to.drive.a.motor.with.1.00.
SF.and.a.1245.A.FLA?.Using.these.values,.determine.whether.
Table.A.or.Table.B.should.be.used.to.calculate.the.setpoints.
Motors.with.a.1.00.SF.need.to.be.derated.by.dividing.the.
Nameplate. FLA. by. 1.15. or. an. Applied. motor. FLA.. This. is.
calculated.as.shown:
1245.Amps
= 1082 Amps
1.15
Line
Parameter
Value
1
Applied.Motor.FLA
1082.A
2
Applied.Service.Factor
1.15
3
Multiply.(Line.1.x.Line.2)
1245.A.
4
hP.rating.of.Vyper.Drive
912.hP
5
Vyper.Amp.Limit.
If.Line.4.is.700/572.hP,.value.is.880.A.
If.Line.4.is.912/752.hP,.value.is.1180.A
1180.A
6
Multiply.Line.5.x.1.05
1239.A
Figure 60 - Ex. 4 motor Amps Safety Calculation Table
The.value.of.Line.3.is.1245.Amps;.this.is.greater.than.the.Line.
6.value.of.1239.Amps..Therefore,.use.Table.B.(Table.18).for.
the.calculation..Refer.to.Figure.53.for.the.locations.to.enter.
calculated.values.
Table B - High Motor Amp Setpoint Calculations
Parameter
Equation
Value
Load.Inhibit
=.Vyper.Amp.Limit.x.0.97
1144.A
Force.Unload
=.Vyper.Amp.Limit
1180.A
Warning
=.Vyper.Amp.Limit.x.1.01
1191.A
Shutdown
=.Vyper.Amp.Limit.x.1.03
1215.A
Figure 61 - Ex. 4 motor Amp Setpoint Calculations (Table B)
VFD Setpoints
(See.Figures.52.and.62)
This.section.of.the.Motor.Screen.describes.programmable.
parameters.that.regulate.the.loading.and.unloading.response.
of.the.Vyper
™
.Variable.Speed.(Frequency).Drive.(VFD)..The.
speed.limits.of.the.motor.control.are.set.in.this.section.of.the.
page..There.are.various.control.strategies.which.are.unique.
to.specific.industries..The.following.pages.will.show.some.
suggestions. that. can. be. used. as. starting. points.. Specific.
applications.may.require.additional.adjustment.
Figure 62 - motor Screen VFD Setpoints
Programming the Motor Screen VFD Setpoints -
.Setting.
the.Motor.Screen.properly.is.critical.to.the.optimal.perfor-
mance.of.the.Vyper
™
.
The.operator.must.understand.how.the.Motor.Screen.VFD.
parameters.affect.the.functionality.of.the.Vyper
™
.unit..These.
setpoints. affect. the. reaction. speed. of. the. VSD. when. ac-
celerating.and.decelerating.as.well.as.affect.the.interaction.
between.the.codes.and.the.slide.valve.
Maximum Drive Output Speed -
.This.parameter.sets.the.
limit.for.the.highest.allowable.motor.speed.in.terms.of.per-
centage.. The. maximum. allowable. setting. is. 100%,. or. full.
speed...Some.applications.may.require.the.maximum.motor.
speed. to. be. limited.. The. Maximum. Percentage. parameter.
range.can.be.set.from.0.to.100%..however,.Frick.recommends.
that.the.Maximum.percentage.is.always.set.to.a.higher.value.
than.the.Minimum.Percentage.parameter.setting.
Minimum Drive Output Speed -
.This.parameter.sets.the.
lowest.allowable.percentage.of.motor.speed.at.which.the.
Vyper
™
.will.permit.the.motor.to.run.for.an.indeterminate.
period..The.range.on.this.function.is.20.to.100%..The.value.
of.this.parameter.must.always.be.set.lower.than.the.Maxi-
mum.Percentage.setting..The.value.of.this.setting.is.critical,.
as. many. electric. motors. are. not. designed. for. low. speed.
operation.due.to.temperature.and.lubrication.requirements..
Frick. recommends. that. the. manufacturer. of. the. motor. is.
contacted.to.determine.if.the.design.can.be.safely.operated.
at.the.intended.minimum.speed.
CAUTION
Programming the Minimum Drive Output Speed to a set-
point lower than the minimum speed recommended by
the compressor motor may result in severe damage to
the compressor motor.
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