
100.210-IOM (FEB 2015)
Page 57
VYPER
™
VARIABLE SPEED DRIVE
OPERATION
VSD LOGIC BOARD SETUP
The.VSD.logic.board.is.equipped.with.a.set.of.eight.(8).DIP.
switches.(SW3),.1,.that.configure.the.RS-485.communica-
tion. between. the. logic. board. and. Quantum
™
LX. Panel. as.
well.as.the.optional.harmonic.filter.board...The.logic.board.
is.mounted.inside.the.Vyper
™
.cabinet..Refer.to.Figure.71.
Figure 71 - Vyper logic Board
The.first.seven.switches.in.SW3.configure.MODBUS.com-
munication.address.with.the.Quantum
™
LX.Panel..To.config-
ure.the.switches.for.proper.communication,.set.switches.1.
through.6.to.the.“OFF”.position..Place.switch.7.in.the.“ON”.
position.. The. resulting. MODBUS. address. is. “0x40”.. Refer.
to.Figure.71.
Switch. 8. on. SW3. allows. harmonic. filter. communication...
Verify.switch.8.is.in.the.“ON”.position.to.allow.proper.com-
munication..Refer.to.Figure.72.
Figure 72 - logic Board SW3
With. the. actual. pressure. at. 21psig. the. proportional. com-
ponent. would. be. 20%.. The. Proportional. Component. is.
calculated.as:.
[(Actual.Value.–.Setpoint)./.PB].x.(Maximum.output.–.Mini-
mum.Output).
[(21.–.20)./.4].x.(100.–.20).=.20%
When.this.proportional.component.is.added.to.the.minimum.
outpoint.setpoint,.the.total.output.is.40%.proportionally.at.
an.actual.value.of.21.psig..It.is.the.Integration.Time.setpoint.
which.will.increase.the.output.over.time.without.an.increase.
in.the.actual.value.
As.long.as.the.actual.value.(21.psig).does.not.change,.the.
Integration.Time.setpoint,.in.this.case.[30.sec],.will.increase.
the. output. by. the. proportional. component. over. every. 30.
seconds.to.drive.the.actual.value.back.to.the.Capacity.Control.
setpoint..If.the.actual.value.remains.21.psig,.the.Integration.
Time.Setpoint.would.increase.the.drive.output.to.100%.over.
1.5.minutes..(See.Figure.70)
Figure 70 - Capacity Control Setpoints Screen