The NFF brake type satises the highest requirements for fatigue strength, robustness
and resistance to sea water. The brakes are constructed and tested in compliance with
DINVDE0580.
The brake is attached to a motor or another machine part using cylinder head screws (xing
screws, item 41).
The bobbin contains a coil that is permanently encapsulated in synthetic resin of thermal
class 155 (F, max. temperature limit 155° C).
When the coil is de-energized, the compression springs (21) press the armature disk (10)
axially against the friction disk with friction lining (2). This is clamped between the armature
disk (10) and the brake ange (11) and thus prevented from rotating. The braking eect is
transmitted to the shaft from the friction disk with friction lining (2) via the pinion (15) and a
feather key.
If the coil is connected to a rated DC voltage according to the specications on the rating
plate (73), the armature disk (10) is pulled against the spring pressure to the coil form (1)
through the electromagnetic force. The friction disk with friction lining (2) is therefore freed
and the braking eect is canceled. The brake is released.
Mechanical release using the manual release bar
By pulling the manual release bar (4) through approx. 30° against the rear side of the brake, the
armature disk (10) is pulled axially against the coil form (1) and the friction disk with friction
lining (2) is then free.
WARNING
Incorrect use of the emergency release
If you use the emergency release to maintain operation temporarily, you may damage the
brake. This can result in personal injury and damage to property.
• Only ever use the emergency release in an emergency.
Power supply line and electrical connection of the brake
The electrical connection must be made in compliance with the installation regulations (e.g. DIN
92). The power connection provided by the customer is 230 V AC +/- 10%.
The coil is dimensioned for the DC voltage specied on the rating plate (residual ripple < 0.5)
and 100% cyclic duration. The continuously permissible voltage change is +6% to -10% of the
rated voltage.
To protect the coil or the power supply, a varistor of the appropriate operating voltage range
and the required power should be connected to the coil input.
Motor components and options
5.2Options
1PH8 SIMOTICS M main motors
196 Conguration Manual, 12/2022, A5E51895839A
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