Twin City Fans With CE Mark - ES-2-06 - Manual (Page 9)

9. Twin.City.Fan.Engineering.Supplement.2-06
•. Plug and Plenum fans..These.fans.are.intended.for.
installation.in.a.user.supplied.enclosure..Twin.City.
Fan. Companies,. Ltd.. rarely. knows. the. details. of.
the.enclosure.and.therefore.can.not.provide.guard-
ing.based.on.the.needs.of.the.final.installation.for.
these.types.of.fans..The.user.must.verify.that.the.
enclosure. a. plug. or. plenum. fan. is. located. in. is.
compliant.with.EN.953.and.EN.294.and.EN.811.
. Guards.shall.not.be.removed.during.fan.operation.as.
this.could.cause.severe.injury..Guards.shall.not.be.stood.
on.or.used.to.support.any.additional.load.
Electrical Supply and Controls
Twin. City. Fan. Companies,. Ltd.. does. not. supply. elec-
trical. controls.. Items. identified. below. are. intended. to.
guide.the.user.in.supplying.controls.in.conformance.to.
Annex.I.of.the.Machinery.Directive.and.EN.14461:2005.
–. Industrial. Fans. –. Safety. requirements.. Furthermore,.
electrical.installations.shall.fulfill.the.requirements.of.EN.
60204-1.and.shall.be.selected.for.compliance.with.the.
low. voltage. directive.. Those. involved. with. the. design.
of. the. electrical. supply. and. control. systems. should.
be. familiar. with. the. above. mentioned. standards. and.
directives.. Control. systems. including. relays,. contactors,.
Variable. Frequency. Drive. Units,. isolating. transformers,.
over-current.and.short.circuit.protection.devices.may.be.
required.. Relays,. contactors,. Variable. Frequency. Drive.
Units,. isolating. transformers,. over-current. and. short.
circuit. protection. devices. should. all. be. in. compliance.
with. the. Low. Voltage. Directive.. The. following. is. a. list.
of.some.of.the.more.common.European.standards.that.
are.observed.when.considering.compliance.with.the.Low.
Voltage.Directive.
EN60742.. -..Isolating.Transformers
EN50178. -..Electronic.Equipment.for.use.in..
. . Power.Installations.
EN60730-2-10. -. Motor.Starting.Relays..
EN60947-2-1. -. Overload.trips.
EN60947-3-1. -. Switches,.Disconnectors,.Switch..
. . Disconnectors.and.Fuse.Combination.....
. . Units.
EN60947-4-1. -. Electro-mechanical.Contactors.and..
. . Motor.control.circuits.
EN60947-5-1. -. Electromechanical.control.circuit..
. . devices.
EN60947-5-5. -. Low.voltage.switchgear.and.control..
. . gear.-.Part.5:.Control.circuit.devices..
. . and.switching.elements.-.Electrical..
. . emergency.stop.devices.with.mechan.
. . ical.latching.function.
EN61810-1. -. Electromechanical.elementary.relays.-.
. . Part.1:.General.and.requirements.
EN60255-23. -. Electrical.relays.-.Part.23:.Contact..
. . performance.
EN60439-1. -. Low.Voltage.Switchgear.and.. .
. . Switchgear.Assemblies,.Part.1.
EN.60034. -. Rotating.Electrical.machines.Parts.1..
. . and.5.
Variable. Frequency. Drive. Units. come. under. the. Low.
Voltage. and. EMC. Directives.. Standards. that. shall. be.
considered. for. compliance. with. the. EMC. Directive. are.
listed.below:.
EN.61000-6-4:.. 2001.Generic.Industrial.Emission..
. . Standard.
EN.55011:. . 1998.+.A1.Conducted.Emissions..
. . Industrial.(Group.1.Class.A)
. In.addition,.controls.shall.meet.the.requirements.for.
category. 2. safety. critical. control. systems. as. detailed.
in. EN. 954-1.. When. a. VFD. is. used,. controls. shall. be.
implemented.to.guard.against.the.VFD.causing.the.fan.
to.run.above.the.maximum.safe.speed.of.the.fan.
. Wiring.diagrams.provided.by.the.electrical.equipment.
manufacture.shall.be.followed.
General Considerations for Controls
Intended. automatic. or. remote. restart. after. short. term.
power. failure. shall. only. be. permitted. if. no. risk. exists.
and.if.there.are.no.other.fault.conditions.
. Warning. signs. that. automatic. or. remote. start. may.
take.place.shall.be.provided.when.applicable.
. After.a.stop.caused.by.the.safety.devices.indicating.
hazardous. conditions,. restart. shall. only. be. possible. by.
an.intentional.operation.of.manual.control.
. When.possible,.electrical.power.cables.connected.to.
fans.should.be.routed.where.there.is.least.risk.of.per-
sonnel.tripping,.walking.into.or.falling.over.such.items.
because.they.have.been.routed.in.areas.where.person-
nel.are.expected.to.move.
. If.it.is.necessary.for.periodical.inspection.and.repairs.
to. override. the. monitoring. and. control. systems. during.
operation,.then.consideration.shall.be.given.to.the.provi-
sion.of.stand-by.fans,.motors.or.other.features..This.is.
allowed.provided.that:
•. The.alarm.system.remains.in.operation.during.the.
override. and. an. alarm. signal. is. given. when. the.
safety.limits.are.reached.
•. Override.is.indicated.by.a.clearly.visible.signal.
•. Override.is.affected.by.auxiliaries.specially.installed.
for.that.purpose,.e.g..key.operated.switches.
Maintenance
Any. maintenance. requiring. the. guards. to. be. removed.
shall.be.performed.while.the.fan.is.not.operating..
When.restarting.fan.after.maintenance,.follow.operation.
checklist.for.start.up.of.fan.
. Lockouts.shall.be.used.whenever.unexpected.energiz-
ing. of. the. fan. could. cause. a. mechanical. or. electrical.
hazard.
Motor Maintenance
The.three.basic.rules.of.motor.maintenance.are:
1..Keep.the.motor.clean.
2..Keep.the.motor.dry.
3..Keep.the.motor.properly.lubricated.
Blow.dust.off.periodically.(with.low.pressure.air).to.pre-
vent.motor.from.overheating.
. If. the. motor. is. to. be. started. after. sitting. for. more.
than. a. week,. the. resistance. of. the. motor. windings. to.
earth.should.be.measured.(at.500.V.DC)..If.the.resis-
tance. is. less. than. 10. megohms,. the. motor. should. be.
dried.until.a.resistance.over.10.megohms.is.measured.
. Some. smaller. motors. are. lubricated. for. life..
Lubrication. requirements. are. normally. attached. to. the.
motor.. Use. the. motor. manufacturer’s. recommendations.
for.re-lubrication..If.this.information.is.not.available,.the.
following. schedule. may. be. used.. Motors. less. than. 10.
HP.running.about.eight.hours.a.day.in.a.clean.environ-
ment.should.be.lubricated.once.every.five.years;.motors.
15.to.40.HP,.every.three.years..For.motors.in.dusty.or.
dirty.environments.or.running.24.hours.a.day:.divide.the.
service. interval. by. 4.. Do. not. over. lubricate.. Note. that.
motors. typically. use. a. different. type. of. lubricant. than.
fan.shaft.bearings.