Twin City Centrifugal Fans - ES-52 - Manual (Page 5)

Twin City Engineering Supplement ES-52 5
Operation Check List
Verify.that.proper.safety.precautions.have.been.followed:
□.Electrical.power.must.be.locked.off.
Check.fan.mechanism.components:
□ System.connections.are.properly.made.and.tightened..
□ Bearings.are.properly.lubricated.
□ Wheel,.drives.and.fan.surfaces.are.clean.and.free.of.
debris.
□ Rotate.the.impeller.by.hand.to.verify.it.has.not.shifted....
..in.transit.
□ Check.fan/wheel.overlap..(See.Figure.7.)
□ Drives.on.correct.shafts.(not.reversed).
□ Check.position.of.guards.to.prevent.rubbing.
Check.fan.electrical.components:
□ Motor.is.wired.for.proper.supply.voltage.
□ Motor. was. properly. sized. for. power. and. rotational.
inertia.of.rotating.assembly.
□ Motor.is.properly.grounded.
□ All.leads.are.properly.insulated.
Trial.“bump”:
□ Turn. on. power. just. long. enough. to. start. assembly.
rotating.
□ Check. rotation. for. agreement. with. rotation. arrow.
Does. the. assembly. make. any. unusual. noise?..
(See.Figure.8.)
□ Check. drive. alignment. and. tension.. Does. this. meet.
with.drive.manufacturer’s.recommendations?
□ Correct. any. problems. which. may. have. been. found....
(Follow. safety. guidelines. -. shut. power. off.). Perform...
checklist.again.until.unit.is.operating.properly.
□ Run.unit.up.to.speed.
Verify.fastener.tightness..These.may.have.loosened.dur-
ing.shipment.or.installation.
□ Setscrews.attaching.wheel.hub.to.shaft.
□ Setscrews.in.drive.sheaves.or.coupling.
□ Nuts.on.inlet.funnel.
□ Nuts.and.bolts.holding.motor.
□ Nuts. holding. housing. frame. to. base. and. base. to.
ground.
□ Nuts. on. accessories. including. shaft. seal,. access.
doors.and.pie-splits.
□ Bolts.in.taper-lock.bushings.
□ Grease.line.connections.
□ After.one.week.of.operation,.check.all.nuts,.bolts.and.
setscrews.and.tighten.if.necessary.
Maintenance of Fans
This. section. contains. general. maintenance. instructions.
for.your.Twin.City.Fan.&.Blower.unit..For.specific.infor-
mation. about. maintenance. of. components,. particularly.
for.special.application.fans,.see.the.attached.documents.
General Motor Maintenance
The.three.basic.rules.of.motor.maintenance.are.keep.the.
motor.clean,.dry.and.properly.lubricated.
. Keeping. motors. and. windings. clean. is. important.
because.dirt.and.dust.serve.as.thermal.insulators..Heat.
normally. dissipated. by. the. motor. is. trapped. causing.
overheating.and/or.premature.failure..Blow.dust.and.dirt.
out.of.windings.and.off.the.motor.periodically..Use.low.
pressure.(50.psig).airstream.so.that.winding.damage.does.
not. occur.. Keep. the. area. surrounding. the. motor. open.
so. the. air. can. circulate. through. the. motor. cooling. fan..
Follow.normal.maintenance.schedule.given.to.the.right.
. Motors. should. be. kept. dry. to. avoid. electrical. short.
circuits..Motors.kept.in.storage.for.long.periods.of.time.
can.have.moisture.condense.on.the.windings..Be.certain.
the.motor.is.dry.before.using.
. Some. smaller. motors. are. lubricated. for. life.. Motor.
bearing. lubrication,. if. required,. must. follow. a. rigorous.
schedule.. Motors. less. than. 10. hp. running. about. eight.
hours. a. day. in. a. clean. environment. should. be. lubri-
cated.once.every.five.years;.motors.15.to.50.hp,.every.
3.years;.and.motors.50.to.150.hp,.yearly..For.motors.
in.a.dusty.or.dirty.environment.or.running.24.hours.a.
day,.divide.the.service.interval.by.2..If.the.environment.
is.very.dirty.or.high.temperatures.exist,.divide.the.ser-
vice.interval.by.4..Lubrication.requirements.are.normally.
attached.to.the.motor..Do.not.overlubricate.
. Motors.controlled.by.variable.frequency.drives.(VFDs).
should.be.wired.in.accordance.with.VFD.manufacturer's.
instructions..The.motor.must.be.grounded.to.earth.and.
proper.shielded.cabling.must.be.used..Grounding.rings.
should.be.considered.
Drive Maintenance
V-belt. drives. need. periodic. inspection. and. occasional.
belt. replacement.. When. inspecting. drives,. look. for. dirt.
buildup,.burrs.or.obstructions.which.can.cause.prema-
ture. belt. or. drive. replacement.. If. burrs. are. found,. use.
fine. emery. cloth. or. a. stone. to. remove. the. burr.. Be.
careful.that.dust.does.not.enter.the.bearings.
. Check. the. sheaves. for. wear.. Excessive. slippage. of.
belts.on.sheaves.can.cause.wear.and.vibration..Replace.
worn.sheaves.with.new.ones..Carefully.align.sheaves.to.
avoid.premature.sheave.failure.
. Observe. belts. for. wear.. If. fraying. or. other. wear. is.
observed. to. be. mostly. on. one. side. of. the. belts,. the.
drives.may.be.misaligned..Reinstall.the.drives.according.
to.instructions.given.for.Fan.Installation.–.Disassembled.
Units..Never.use.belt.dressing.on.any.belts.
. When. replacing. belts,. replace. the. entire. set.. After.
initial. replacement. and. tensioning,. recheck. belt. tension.
after.a.few.days.to.adjust.belt.tension.again..(New.belts.
require.a.break-in.period.of.operation.)
Bearing Maintenance
For. instructions. covering. special. lubrication. intervals,.
bearing.assembly.or.disassembly,.or.installation.details,.
see. attached. documents.. Any. bearing. which. is. disas-
sembled. should. be. kept. separate. from. other. bearing.
parts. as. components. may. not. be. interchangeable..
Maintain. cleanliness. of. components. and. bearings. to.
prevent.bearing.contamination.
BAF, BAE, EPF, EPQ,
APF & APQ Wheels
HIB, BCS
& BCN
Wheels
BC, RBA &
TBA Wheels
HRT & RTF
Wheels
FC & NFC
Wheels
RBO, RBW, RBR
MBO, MBR &
TBR Wheels
Rotation
Figure 8. Proper Wheel Rotation