Twin City Fans With CE Mark - ES-2-06 - Manual (Page 11)

11. Twin.City.Fan.Engineering.Supplement.2-06
All.of.the.above.conditions.could.lead.to.mechanical.fail-
ure.causing.safety.hazards.including.exposure.to.ejected.
objects.and.toxic.material.or.vapors.
. For.high.temperature.applications,.it.is.recommended.
that. an. auxiliary. device. be. provided. (such. as. a. turn-
ing.gear.available.from.Twin.City.Fan.Companies,.Ltd.).
to. slowly. rotate. the. fan. when. it. is. not. operating. while.
exposed.to.high.temperatures..Exposure.to.high.tempera-
tures.while.not.operating.could.be.due.to.a.power.failure.
or.standard.operation.of.a.process.
. When. multiple. fans. are. installed. for. redundancy,. the.
fan.used.shall.be.switched.at.least.weekly.to.avoid.the.
need.for.storage.considerations.
Sound
Sound.power.levels.are.supplied.with.each.fan..These.
levels. are. based. on. AMCA. 300. reverberant. room. test.
methods.. This. method. is. similar. to. ISO. 3741.. Field.
installation. and. conditions. can. affect. sound. greatly..
Because.of.this,.the.user.shall.verify.if.the.sound.pres-
sure.levels.in.the.installed.condition.are.below.70.dBA..
If.sound.pressure.levels.are.above.70.dBA,.actions.shall.
be.taken.to.reduce.sound.pressure.levels.to.acceptable.
levels.
The. following. EN. standards. can. be. referred. to. as. a.
guide.when.making.noise.measurements:.
EN.809.EN.ISO.5136:2003. -. Acoustics.-.Determination.
of.sound.power.radiated.
into.a.duct.by.fans.and.
other.air-moving.devices.
-.In-duct.method.
EN.ISO.11200/A1.1997. -. Noise. emitted. by.
machinery. and. equip-
ment. -. Guidelines. for.
the. use. of. basic. stan-
dards.for.the.determina-
tion. of. sound. pressure.
levels. at. a. workstation.
and. at. other. specified.
positions.
EN.ISO.11202/A1.1997. -. Noise. emitted. by.
machinery. and. equip-
ment.-.Measurement.of.
emission.sound.pressure.
levels. at. a. workstation.
and. at. other. speci-
fied. positions. –. Survey.
method.in.situ.
TYPE OF MAINTENANCE WHEN TO DO WHAT TO DO
Check.for.sheave.groove.wear Initial.inspection:.8.hours..Second.in-
spection:. 24. hours.. Third. inspection:.
100.hours..Periodically.thereafter.* Check.for.belt.ride.in.the.groove..In.multiple.groove.
drives,.belt.ride.should.be.uniform,.not.more.than.
1/16".above.or.below.top.of.sheave.groove..Check.
groove. wear. area. for. wear.. Side. wall. of. groove.
should.be.straight,.not.dished.out..Bottom.of.groove.
should.show.no.signs.of.belt.contact.
Check.for.sheave.runout. Initial.inspection:.8.hours..Second.in-
spection:. 24. hours.. Third. inspection:.
100.hours..Periodically.thereafter.* Check.sheave.by.eye.for.runout..If.runout.is.exces-
sive,.it.can.easily.be.seen.by.visual.inspection..If.
runout. is. noticeable,. check. sheave. for. source. of.
problem.and.correct.
Inspect. for. heat. build-up. and.
proper.ventilation Initial.inspection:.8.hours..Second.in-
spection:. 24. hours.. Third. inspection:.
100.hours..Periodically.thereafter.* Check. bolts. for. heat.. Ambient. temperature. should.
not.exceed.140°F..Contact.temperatures.should.not.
exceed.180°F..Make.sure.drives.are.properly.ven-
tilated.
Clean.belts.and.sheave.grooves Initial.inspection:.8.hours..Second.in-
spection:. 24. hours.. Third. inspection:.
100.hours..Periodically.thereafter.* Inspect.belts.for.contaminates,.such.as.oil.or.grease..
Wipe.belts.clean.with.detergent.and.water..Inspect.
sheave. grooves. for. build-up. of. such. material. and.
remove,.if.necessary.
Check.belt.tension Initial.inspection:.8.hours..Second.in-
spection:. 24. hours.. Third. inspection:.
100.hours..Periodically.thereafter.* Check. belt. tension. using. BROWNING. belt. tension.
checker..Tension.to.recommendations.shown.in.cur-
rent.catalogs.
Check.sheave.alignment Initial.inspection:.8.hours..Second.in-
spection:. 24. hours.. Third. inspection:.
100.hours..Periodically.thereafter.* Check. alignment. with. straight. edge,. string. or. ma-
chinist. level.. Correct. alignment. to. as. near. perfect.
as.possible.
Mismatched.belt.check Initial.inspection:.8.hours..Second.in-
spection:. 24. hours.. Third. inspection:.
100.hours..Periodically.thereafter.* Check. belt. sag. on. slack. side. of. drive.. All. belts.
should.have.a.slight.bow..If.this.bow.is.not.uniform.
with. all. belts,. replace. entire. set. with. a. matched.
set.
Check.for.worn.belts Initial.inspection:.8.hours..Second.in-
spection:. 24. hours.. Third. inspection:.
100.hours..Periodically.thereafter.* Check. wear. surfaces. for. belt. for. excessive. wear..
if. belts. have. a. slick,. glazed. look,. belts. ares. lip-
ping..Check.drive.capacity.and.belt.tension..Never.
replace.only.one.belt.in.a.used.set,.as.used.belts.
will. elongate.. Replace. entire. set. if. replacement. is.
necessary.
Check. sheave. setscrews. and/or.
busing.capscrews Initial.inspection:.8.hours..Second.in-
spection:. 24. hours.. Third. inspection:.
100.hours..Periodically.thereafter.* Check.all.setscrews.and/or.bushing.capscrews.for.
looseness..Retighten.to.recommended.torque,.if.ne-
cessary.
Table 5. Drive Maintenance and Inspection
* Inspections listed as “Periodically” must be performed at least monthly for ATEX fans.