Carrier 39E - Manual (Page 6)

ELECTRICAL COM FOMENT IDENTÍFICATIOM {Rg< 4, 5, 6)
Indksatfng ü^ht OU — Media runout hghi, auto-
ïnaik üecîioas only. Red, acti%atcd by media runout
switch. Illuminates» when filter media on supply
spool is depleted.
Manual Overnde Switch iMOSj — Overrides
automatic advance circuit, activates motor circuit to
permit manual motonr.ed media advancement such
as during media threading operation.
Media Runout Switch |MRS) — Prevents opera­
tion of gear motor when supply spool media is de­
pleted. Activates red indicating light.
Madia Switch IMS) Desenergizes motor cir­
cuit. Allows motor operation from supply side.
Used in conjunction with manual override switch.
Motor {MTRÎ — Operates take-up spool gear
drive to advance filter media, ntermally-protected.
6-rpm, I lô-hp. Gear drive reduces take-up spool
speed to 3 rpm.
Operating light (Ot) — Aatomatic sections only.
Amber, indicates that control switches are in correct
mode, Li^t goes out momentarily when pressure
switch activates motor circuit. If electrical or mech­
anical malfunction occurs, light gîses out and stays
out to indicate possible power failure or that pres­
sure drop thru airway exceeds air pressure switch
setting due to mechanical failure. Light is re­
energized when pressure or power is restored,
Fulse Gerwmior Switch |PGS> ~- Athomatic
sections only: activated by media metering wheel
cam to operate sequence relay.
Fressure Switch {PS) — Automatic sections only.
Senses pressure drop thru media iu airway. .At preset
pressure (0,5$ in, wg factory setting, adjustable) it
activates motor circuit Camber operating light goes
out). When pressure drops below setting, switch
returns to turn on operating light.
Sequence Relay fSR) — Automatic sections only.
A holding relay that maintains motor operating
mrcait. Senses pulses genmated by pulse ^nerator
switch to advance ratchet cam shaft,
On-Off Switch ISVIQ — Power switch. Controls
all power to motor and control circuit (DPST),
B&WÚ CTS) — Provides quick-connect
termináis for indicator ll^ts or other fmld-
oonneeted oompoueota,
Ptilsa iSormrator Aaaambly S) Consists
of media metering wheel, pulse generator switch
and sequence relay. Except for making .sure that
media metering wheel tension against media is
suffieient to turn wheel as media passes bv, little or
no service can be performed beyond keeping media
wheel and shaft free of lint and making
sure that electrical connections are intact. The
assembly function.^ a,s follows:
As air pressure increases due to restriction caused
by dirty filtes media, pressure switch closes acti­
vating motor to advance media, .Media passing
metering wheel causes wheel to turn. Eccentric
closes pulse generator switch which momcniarily
energizes sequence relay once each rev'olution. Se­
quence relay arm advances ratchet wheel one notch
causing relay switch arm cam follower to ride up out
of valley. Sequence relay contacts on relay switch
arm close maintaining pow'er to motor. As media
metering wheel continues to trip sequence relay,
pulses advance ratchet until catn follower drops into
valley thus de-energizing motor power. Media
advancement
ceases. Valley-to-valiey interval,
which depends on media metering whxl diameter
and number of valleys. Is “programmed” to operate
motor so that a predetermined length of media h
advanced into airway for full span operation.
Ratchet and cam may be advanced manually (clock­
wise} by either turning cam or repeatedly pressing
on sequence coil arm such as when operational
check requires manual advance.