SIEMENS
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Siemens CR 1 · 2015
7
SIMOTICS motors for cranes
SIMOTICS SD – Severe Duty motors
KFB spring-set brake for SIMOTICS SD 1LP4, 1LP6
■
Design
The electromagnetic double-disc spring-set brake KFB, see
picture "KFB spring-set brake with manual lever", is intended to
operate solely as a holding brake for this application. With the
exception of emergency braking, it may only be operated as a
dynamically loaded operational brake if it is appropriately di-
mensioned or after consultation with the manufacturer. It is a
spring-loaded, electrically operated, double-disc brake, which
operates when the power is switched off. When the coil (
2
) is
energized with a DC voltage, the brake is released electromag-
netically. If the coil (
2
) is de-energized, the springs (
6
) press the
armature plate (
4
) axially against the friction-lining carrier (
5
)
which in turn presses against the brake flange
(
7
); this sequence
provides the braking action. The brake is released when the
coil (
2
) is energized. The magnetic field attracts the armature
plate (
4
) towards the coil form (
1
), counteracting the spring
pressure on the coil form. The air gap can be adjusted within a
wide range, ensuring high availability of the brake. The motor
and brake are coupled by means of a flange (
12
). Emergency
brake release is possible by means of 2 emergency release
screws – optionally with hand lever release.
As a result of the compact design with the enclosed coil form
housing and appropriate sealing from the shaft, the brake has
degree of protection IP67 when the housing is closed.
All the brake connections such as coil, microswitch, etc. are
taken to the motor terminal box.
KFB spring-set brake with manual lever
Rotary encoder POG10
Tacho bushing T2 with coupling and assembly components
KFB brake
IEC mounting flange
Hand lever for emergency release (option)
1
2
3
4
5
G_CR01_EN_00060
1
2
3
4
5
Coil form
Coil
Hub
Armature plate
Friction-lining carrier
Springs
Brake flange
Hand lever
Housing
Tacho assembly
components
Service screw
Mounting flange
1
2
3
4
5
6
7
8
9
10
11
12
G_CR01_EN_00059
8
7
9
3
5
4
11
2
6
1
12
10
© Siemens AG 2015