
100.210-IOM (FEB 2015)
Page 23
VYPER
™
VARIABLE SPEED DRIVE
INSTALLATION
In. today’s. refrigeration. plants,. electronic. controls. have.
found. their. way. into. almost. every. aspect. of. refrigeration.
control.. . Electronic. controls. have. brought. to. the. industry.
more.precise.control,.improved.energy.savings,.and.operator.
conveniences..Electronic.control.devices.have.revolutionized.
the.way.refrigeration.plants.operate.today...
The. earlier. relay. systems. were. virtually. immune. to. radio.
frequency.interference.(RFI),.electromagnetic.interference.
(EMI),.and.ground.loop.currents..Therefore.installation.and.
wiring.were.of.little.consequence.and.the.wiring.job.con-
sisted. of. hooking. up. the. point-to-point. wiring. and. sizing.
the.wire.properly..In.an.electronic.system,.improper.instal-
lation.will.cause.problems.that.may.outweigh.the.benefits.
of.electronic.control..Electronic.equipment.is.susceptible.to.
RFI,.EMI,.and.ground.loop.currents.which.can.cause.equip-
ment.shutdowns,.processor.memory.and.program.loss,.as.
well.as.erratic.behavior.and.false.readings..Manufacturers.of.
industrial.electronic.equipment.take.into.consideration.the.
effects.of.RFI,.EMI,.and.ground.loop.currents.and.incorpo-
rate.protection.of.the.electronics.in.their.designs..however,.
these. design. considerations. do. not. make. the. equipment.
immune,.so.manufacturers.require.that.certain.installation.
precautions.be.taken.to.protect.the.electronics.from.these.
effects..All.electronic.equipment.must.be.viewed.as.sensitive.
instrumentation.and.therefore.requires.careful.attention.to.
installation.procedures..These.procedures.are.well.known.to.
instrumentation,.networking,.and.other.professions.but.may.
not.be.followed.by.general.electricians..
There.are.a.few.basic.practices.that.if.followed,.will.minimize.
the. potential. for. problems. resulting. from. RFI,. EMI. and/or.
ground.loop.currents..The.National.Electric.Code.(NEC).is.a.
guideline.for.safe.wiring.practices,.but.it.does.not.necessarily.
deal.with.procedures.used.for.electronic.control.installation..
Use.the.following.procedures.for.electronic.equipment.instal-
lation..These.procedures.do.not.override.any.rules.by.the.
NEC,.but.are.to.be.used.in.conjunction.with.the.NEC.code.
and.any.other.applicable.codes..
With.exclusion.of.the.three.phase.wire.sizing,.Frick.drawing.
649D4743.should.be.used.as.a.reference.for.properly.sizing.
control.wires.and.other.wiring.specifications..
Throughout.this.document.the.term.Electronic.Control.Panel.
is.used.to.refer.to.the.microprocessor.mounted.on.the.com-
pressor.package.or.a.Central.Control.System.panel..
NOTICE
It is very important to read the installation instructions
thoroughly before beginning the project. Make sure you
have drawings and instructions with your equipment.
If not, call the manufacturer and request the proper
instructions and drawings. Every manufacturer of elec-
tronic equipment should have a knowledgeable staff,
willing to answer your questions or provide additional
information. Following correct wiring procedures will
ensure proper installation and consequently, proper
operation of your electronic equipment.
WIRE SIzING
Control.power.supply.wires.should.be.sized.one.size.larger.
than.required.for.amperage.draw.to.reduce.instantaneous.
voltage.dips.caused.by.large.loads.such.as.heaters,.contac-
tors,.and.solenoids..These.sudden.dips.in.voltage.can.cause.
the.electronic.control.panel,.whether.it.is.a.microprocessor,.
a.computer,.or.a.PLC,.to.malfunction.momentarily.or.cause.
PROPER INSTALLATION OF ELECTRONIC EQUIPMENT IN AN INDUSTRIAL ENVIRONMENT
a.complete.reset.of.the.control.system..If.the.wire.is.loaded.
to.its.maximum.capacity,.the.voltage.dips.are.much.larger,.
and.the.potential.of.a.malfunction.is.very.high..If.the.wire.
is.sized.one.size.larger.than.required,.the.voltage.dips.are.
smaller.than.in.a.fully.loaded.supply.wire.and.the.potential.
for.malfunction.is.much.lower..The.NEC.code.book.calls.for.
specific.wire.sizes.to.be.used.based.on.current.draw..An.
example.of.this.would.be.to.use.#14.gauge.wire.for.circuits.
up.to.15.amps.or.#12.gauge.wire.for.circuits.of.up.to.20.amps...
Therefore,. when. connecting. the. power. feed. circuit. to. an.
electronic.control.panel,.use.#12.gauge.wire.for.a.maximum.
current.draw.of.15.amp.and.#10.wire.for.a.maximum.current.
draw.of.20.amp..Use.this.rule.of.thumb.to.minimize.voltage.
dips.at.the.electronic.control.panel.
VOLTAGE SOURCE
Selecting. the. voltage. source. is. extremely. important. for.
proper. operation. of. electronic. equipment. in. an. industrial.
environment..Standard.procedure.for.electronic.instrumenta-
tion.is.to.provide.a.clean,.isolated,.separate-source.voltage.
in.order.to.prevent.EMI.(from.other.equipment.in.the.plant).
from.interfering.with.the.operation.of.the.electronic.equip-
ment..Connecting.electronic.equipment.to.a.breaker.panel.
(also.known.as.lighting.panels.or.utility.panels).subjects.the.
electronic.equipment.to.noise.generated.by.other.devices.
connected.to.the.breaker.panel..This.noise.is.known.as.elec-
tromagnetic.interference.(EMI)..EMI.flows.on.the.wires.that.
are.common.to.a.circuit..EMI.cannot.travel.easily.through.
transformers. and. therefore. can. be. isolated. from. selected.
circuits..Use.a.control.power.transformer.of.the.proper.VA.
rating,.usually.provided.in.the.compressor.drive.motor.starter,.
to.isolate.the.electronic.control.panel.from.other.equipment.
in.the.plant.that.generate.EMI..See.Figure.below.
Figure 13 - Voltage Source Circuit For EmI Prevention
Содержание Frick 572
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