LEESON 143-5TC Double C-Face Coupler - Manual (Page 4)

T
orque lb. f
t.
Leeson
Part
Number
Stearns
Part
Number
Brake Coil
Rating (VAC)
NEMA
Enclosure
Brake Bore/
Shaft Diameter
(X/U)
NEMA
Frame Size
Dimension
A
3
175563.00 1056711051PF 115/208-230 2 5/8” / 5/8” 56C 4.91”
175564.00 1056711051QF 208-230/460 2 5/8” / 5/8” 56C 4.91”
175565.00 1056711051NF 575 2 5/8” / 5/8” 56C 4.91”
175566.00 1056714051PF 115/208-230 4X 5/8” / 5/8” 56C 4.94”
175567.00 1056714051QF 208-230/460 4X 5/8” / 5/8” 56C 4.94”
175568.00 1056714051NF 575 4X 5/8” / 5/8” 56C 4.94”
6
175569.00 1056721081PF 115/208-230 2 7/8” / 5/8” 56C/143-5TC 4.91”
175570.00 1056721081QF 208-230/460 2 7/8” / 5/8” 56C/143-5TC 4.91”
175571.00 1056721081NF 575 2 7/8” / 5/8” 56C/143-5TC 4.91”
175572.00 1056724081PF 115/208-230 4X 7/8” / 5/8” 56C/143-5TC 4.94”
175573.00 1056724081QF 208-230/460 4X 7/8” / 5/8” 56C/143-5TC 4.94”
175574.00 1056724081NF 575 4X 7/8” / 5/8” 56C/143-5TC 4.94”
10
175575.00 1056731081PF 115/208-230 2 7/8” / 5/8” 56C/143-5TC 4.91”
175576.00 1056731081QF 208-230/460 2 7/8” / 5/8” 56C/143-5TC 4.91”
175577.00 1056731081NF 575 2 7/8” / 5/8” 56C/143-5TC 4.91”
175578.00 1056734081PF 115/208-230 4X 7/8” / 5/8” 56C/143-5TC 4.94”
175579.00 1056734081QF 208-230/460 4X 7/8” / 5/8” 56C/143-5TC 4.94”
175580.00 1056734081NF 575 4X 7/8” / 5/8” 56C/143-5TC 4.94”
15
175581.00 1056741071QF 208-230/460 2 7/8” / 7/8” 143-5TC 4.91”
175582.00 1056744071QF 208-230/460 4X 7/8” / 7/8” 143-5TC 4.94”
P
ART NUMBERS
COIL FAILURE
SUPPLY VOLTAGE CAUSE SUPPLY VOLTAGE CORRECTION
Line voltage >110% of coil rating Reduce voltage or replace with
proper rated coil
Excessive voltage drop during inrush time Increase current rating of power supply.
WIRING CAUSE WIRING CORRECTION
Leadwires interfering with plunger pull-in
Reroute wiring away from plunger and
other moving components.
Excessive voltage drop during inrush time Increase leadwires size from power supply
Coil leadwire shorted to ground Replace coil or leadwire and protect with
wire sleeving
SOLENOID ASSEMBLY CAUSE
SOLENOID ASSEMBLY
CORRECTION
Plunger not seating flush against
solenoid frame Loosen solenoid mounting screws and
reposition frame to allow full face contact
Plunger cocked in coil preventing pull-in Realign solenoid frame
Excessive solenoid/plunger wear at
mating surface
Replace solenoid assembly
Broken shading coils Replace solenoid assembly
WORN PARTS CAUSE WORN PARTS CORRECTION
Excessive wear of solenoid link arm
and/or shoulder bolt Replace link arm and link bolt; also
inspect plunger thru-hole for elongation
Plunger guides worn down and interfering
with plunger movement Replace guides
APPLICATION CAUSE APPLICATION CORRECTION
Machinery cycle rate is exceeding brake
rating Reduce brake cycle rate or use
alternate control method
High ambient temperature (>110%) and
thermal load exceeding coil insulation
rating Use Class H rated coil and /or find
alternate method of cooling brake
Brake coil wired with windings of an
Inverter motor or other voltage/current
limiting device Wire coil to dedicated power source with
instantaneous coil rated voltage
MISCELLANEOUS CAUSE MISCELLANEOUS CORRECTION
Wrong or over tightened torque Replace with proper spring or refer to
Installation section for proper spring height
Excessive air gap Reset, refer to Installation Section 4
EXCESSIVE WEAR / OVERHEATING
AIR GAP CAUSE AIR GAP CORRECTION
Low solenoid air gap Reset air gap (refer to Air Gap
Adjustment)
Disc pack dragging Inspect endplate, hub and discs for dirt,
burrs, wiring and other sources of interfer-
ence preventing disc “float”
CYCLE RATE CAUSE CYCLE RATE CORRECTION
Brake “jogging” exceeding coil cycle rate Reduce cycle rate or consider
alternate control method
Thermal capacity is being exceeded Reduce cycle rate, use alternate control
method or increase brake size
ALIGNMENT CAUSE ALIGNMENT CORRECTION
Broke endplate not concentric to motor
C-Face Motor register must be within .004” on
concentricity;
Motor shaft runout is excessive Must be within .002”; runout; consult
motor manufacturer
Brake is being operated on a incline
greater than 15° above or below
horizontal Vertical separator springs must be used to
prevent discs from becoming cocked
WORN PARTS CAUSE WORN PARTS CORRECTION
Friction disc excessively worn (disc can
wear to 1/2 original thickness or .093”) Replace friction discs.
Endplate, stationary disc or pressure
plate warped Replace warped or worn component
Linkages and/or pivot pins worn Replace all worn components
Motor shaft endfloat excessive Endfloat must not exceed .020”;
consult motor manufacturer
HUB CAUSE HUB CORRECTION
Burr on hub interfering with disc “float” File off burr
Set screw backed out and interfering with
disc Retighten set screw; use Loctite® 242 to
help secure
MISCELLANEOUS MISCELLANEOUS
Solenoid plunger not pulling completely Check line voltage (±10% of
nameplate rating) or replace worn
solenoid assembly
Wiring is restricting disc pack movement Reroute wiring
Excessive stop time
(2 seconds or greater) Increase brake size/torque or use alter-
nate control method
High Ambient temperature
(in excess of 110°F) Reduce cycle rate or use alternate
method of cooling
Moisture in brake Remove drain plug (WASHGUARD
brakes only). After fluid has drained
replace plug
TROUBLESHOOTING
4