LEESON 210 C-Face Motors - Manual (Page 4)

4
P
ART NUMBERS
Leeson
Part Num-
ber
Stearns Part
Number
Brake
Coil
Rating
(VAC)
NEMA
Enclosure
Brake
Bore &
Shaft
Dia.
(U/X)
NEMA
Frame
Size
Dimensions (Inches)
A C
A
E A
G
A
H
175583.00 1087721011QG
230/460
2
1-1/8”
180
8.38 2.81 2.12 0.19 2.62 175584.00 1087722B11QG 4X
175585.00 1087731011QG 2
8.38 2.81 2.12 0.19 2.62 175586.00 1087732B11QG 4X
175587.00 1087741031QG 2
1-3/8”
210
8.38 2.81 2.12 0.19 3.12 175588.00 1087742B31QG 4X
175589.00 1087751031QG 2
8.88 3.31 2.62 0.44 3.12 175590.00 1087752B31QG 4X
18. If a heater is supplied and excess rusting
has occurred in brake, check power source
to heater to be sure it is operating and that
heater is not burned out.
19. If stopping time is more than two seconds
(rule of thumb) and/or the application is
more than five stops per minute, check
thermal requirements of load versus ther-
mal rating of brake.
20. Use Loctite ® 242 to secure link screw nut
to link screw if vibration causes nut to
loosen.
B. If brake hums, solenoid pulls in slow-
ly, or coil burns out, check the following:
1. Voltage supply at coil versus coil rating.
2. Is solenoid air gap excessive?
(See Self-Adjust Maintenance .)
3. Shading coils may be broken.
4. Plunger guides may be excessively worn.
Does solenoid plunger rub on solenoid
frame laminations? If so, replace plunger
guides.
5. Solenoid frame and plunger may be exces-
sively worn.
6. Is solenoid dirty?
7. Solenoid mounting screws may have
become loose, causing frame to shift and
plunger to seat improperly.
8. Sector gear and pinion teeth may be jam-
ming due to excessive tooth wear.
9. Excessive voltage drop when motor starts.
Check size of lead wires for motor starting
current and solenoid inrush current. See
Section IV-A, Item 11, 12, 14 and 15.
C. If brake is noisy during stopping:
1. Check mounting face run out, mounting rab-
bet eccentricity and shaft run out. See
Installation Procedure , Section I, Note 1.
Correct as required.
2. Check for signs of the outside diameter of
the friction disc(s) rubbing on the inside
diameter of the endplate. This would indicate
brake is eccentric with respect to the motor
shaft and/or the shaft is deflecting during a
stop. Check alignment and shaft diameter.
Also check for worn motor bearings. If
realignment does not correct the problem, a
larger diameter shaft may be required. Shaft
deflection may also be caused by excessive
overhang of brake from motor bearing.
Additional shaft support may be required.
3. Check for bad motor bearings. Replace
if necessary. Check for excessive shaft end-
float. Correct as required.
Color
Torque
(lb-ft)
Compressed
Spring Length
White 15 3-1/4”
Orange 25 & 50 3-1/4”
Purple 35 3-1/4”