Functioning And Design Characteristics Of The Standard Versions 4 - Siemens SIMOTICS M-1PH818 Instrucciones De Servicio

Service Instructions NFF
Electromagnetic Double Face Spring – Applied Brake
4.2 Functioning and design characteristics of the standard version
The brake NFF is a spring-loaded electromagnetic double-face brake which brakes without
current and is released electromagnetically.
The brake type NFF meets highest requirements with regard to fatigue strength and robustness
and is seawater-proof. The brakes are manufactured and tested in accordance with DIN VDE
0580.
The brake is screwed to a motor or any other machine part by means of cyl. screws (mounting
screws pos. 41).
The coil body contains a coil which is potted with a synthetic resin compound in accordance
with thermical class 155 (F), (max. limit of temperature 155°C).
If the coil is not excited, the springs (21) press the armature disc (10) against the friction disc
(2), which is firmly clamped between the torsion-protected armature disc (10) and the brake disc
(11) and thus prevented from rotating. The braking effect is transmitted from the geared friction
disc (2) via the hub (15) and a fitting key to the shaft. If the coil is connected to a direct voltage
as specified on the identification plate (73), the magnetic force will draw the armature disc (10)
to the coil body (1) overcoming the spring pressure. The friction disc (2) is released, the braking
effect is cancelled and the brake is released.
4.3 Mechanical release by means of emergency release screws
Fig. 2
1 coil body with coil
11 brake flange
13 outer body
49 emergency release screw
50 cap screw for axial emergency release
81 seal ring
Stromag Dessau
IP 66
8
safety in motion
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