Technical data
33-158
For more information contact Cutler-Hammer at: www.ch.cutler-hammer.com/catalog CAT.201.01.T.E
January 2001
NEMA Contactors & Starters
33
AC and DC Magnetic Shoe Brakes
511 Series
Vol. 2, Ref. No. [0174]
Contents
Description Page
AC and DC Magnetic Shoe Brakes
Product Description . . . . . . 33-158
Application Description. . . . 33-158
Features . . . . . . . . . . . . . . . . 33-158
Brake Selection . . . . . . . . . . 33-158
Shipping Weights . . . . . . . . 33-158
Dimensions . . . . . . . . . . . . . 33-159
Product Selection . . . . . . . . 33-160
Size S-7 Brake and Wheel
Product Description
Cutler-Hammer Type S brakes are
electrically released and spring
applied providing “fail-safe” opera-
tion. The retarding torque developed is
directly proportional to the spring
pressure.
Application Description
■ Conveyors
■ Machine tools
■ Printing presses
■ Small cranes
■ Overhead doors
■ Dumb waiters
■ Vacuum molding machines
■ Carnival rides
Features
The brake wheel is of relatively large
size in relation to the torque developed
by the brake. This permits use of a
larger brake shoe lining and lower
shoe pressures. Low shoe pressure,
equally distributed over a large lining
area, results in even wear of the fric-
tion surfaces and even braking torque.
The oversize wheel type construction
also permits use of a smaller operating
solenoid that requires less current for
a given torque rating.
DC Brakes
Standard DC brakes are equipped with
shunt coils. The magnet coil circuit on
DC brakes consists of two separate
windings and a protective switch.
Mounting
Type S brakes are designed and rec-
ommended for use and mounting only
in the horizontal position. Side or verti-
cal mountings are not recommended
because the solenoid loading is
altered, resulting in accelerated wear
and premature coil failure.
Brake Selection
The method most generally used to
determine required braking torque is
to calculate the full load motor torque
by the following formula:
The torque rating of the brake selected
should be at least equal to the full load
motor torque for the duty considered.
Figure 33-57. Standard Brake Wheels —
Approximate Dimensions
Table 33-265. Standard Brake Wheel Dimensions
1
Hub lengths other than standard are not available.
Shipping Weights
Table 33-266. Approximate Shipping Weights
T = 5252 x hp
rpm
T = Full load motor torque in lb-ft
hp = Motor horsepower
rpm = Speed of shaft on which
brake wheel is mounted
W
Z
X
A
Y
Approximate Dimensions in Inches (mm) Bore
AZW
1
X Y Max. Min.
4.00 (101.6)
5.50 (139.7)
7.00 (177.8)
10.00 (254.0)
2.75 (69.9)
3.25 (82.6)
4.25 (108.0)
4.25 (108.0)
1.63 (41.4)
2.00 (50.8)
3.00 (76.2)
3.25 (82.6)
1.38 (35.1)
1.63 (41.4)
1.25 (31.8)
1.25 (31.8)
2.50 (63.5)
3.25 (82.6)
4.00 (101.6)
4.88 (124.0)
1.38 (35.1)
2.00 (50.8)
2.25 (57.2)
2.88 (73.2)
.50 (12.7)
.75 (19.1)
1.00 (25.4)
1.38 (35.1)
Brake Size Torque Rating
ft-lb
Weight in Lbs. (kg)
Net —
Brake with Wheel
Net —
Wheel Only
Boxed —
Brake with Wheel
Type “S” AC Shoe Brakes
S-4
S-4
S-4
S-5-1/2
S-5-1/2
S-7
S-7
3
10
15
25
35
50
75
15.8 (7.2)
15.8 (7.2)
15.8 (7.2)
33.2 (15.1)
33.2 (15.1)
52.1 (23.7)
52.1 (23.7)
3.4 (1.5)
3.4 (1.5)
3.4 (1.5)
7.5 (3.4)
7.5 (3.4)
18.8 (8.5)
18.8 (8.5)
17.0 (7.7)
17.0 (7.7)
17.0 (7.7)
36.0 (16.3)
36.0 (16.3)
55.0 (25.0)
55.0 (25.0)
S-10 125, 160 200.0 (90.8) 38.5 (17.3) 225.0 (102.2)
Type “S” DC Shoe Brakes
S-4
S-4
S-4
S-5-1/2
S-5-1/2
S-7
S-7
S-7
S-7
3
10
15
25
35
50
75
85
110
18.0 (8.2)
18.0 (8.2)
18.0 (8.2)
35.0 (15.9)
35.0 (15.9)
54.0 (24.5)
54.0 (24.5)
54.0 (24.5)
54.0 (24.5)
3.4 (1.5)
3.4 (1.5)
3.4 (1.5)
7.5 (3.4)
7.5 (3.4)
18.8 (8.5)
18.8 (8.5)
18.8 (8.5)
18.8 (8.5)
20.0 (9.1)
20.0 (9.1)
20.0 (9.1)
38.0 (17.3)
38.0 (17.3)
58.0 (26.3)
58.0 (26.3)
58.0 (26.3)
58.0 (26.3)
Tab3305.fm Page 158 Monday, October 23, 2000 10:19 PM