User`s manual

58
ELECTROMAGNETIC “BABY” DISK BRAKE IN STANDARD OR EXPLOSION-PROOF EXECUTION –
DIRECT CURRENT FEEDING
BRAKE
When power is supplied to the brake, the electromagnet (3) is energised overcoming the pressure exerted by the springs (4) by
means of the floating keeper (2), in so doing freeing the friction disc (6) and allowing the motor shaft to rotate freely. When the
electric power to the brake is interrupted, the electromagnet (3) being de-energised enables the springs (4) to re-exert pressure
on the brake disk via the floating keeper (2), thus stopping rotation of the motor shaft.
This arrangement referred to as "Fail Safe" means that with the power on, the brake is released, and with the power off, the
brake is automatically applied.
MAINTENANCE
After the unit has been in service for a maximum of 12 months, or should a reduction in braking efficiency be detected, the
brake disc (6) must be checked for damage or excessive wear.
The following sequences should be applied:
A) Disconnect brake feeder cable at motor terminal box.
B) Remove brake cover (7).
C) Carefully remove electromagnet (3) and keeper plate (2) from the location pins, leaving spacers (9) in position.
D) Remove the mobile disc (6) and with a Micrometer check the thickness, if less the 5 mm, it should be replaced.
E) Whilst the electromagnet is removed, examine all brake springs (4), if there is any sign of spring fatigue, all springs
should be replaced.
F) When re-assembling it is important that the brake feeder cable is not trapped or in any way the insulation damaged.
IMPORTANT
From the aforementioned it will be apparent that by reducing the quantity, or the rating of the springs, the
torque and the subsequent efficiency of the brake can be affected.
NEITHER THE QUANTITY NOR THE RATING OF THE SPRINGS SHALL BE ALTERED WITHOUT THE
MANUFACTURES APPROVAL; THE SAME APPLIES TO ANY OTHER COMPONENTS.
1
FIXED DISK
2
FRICTION DISK
3
PINION HUB
4
MOBILE DISK
5
SPACER
6
ASSEMBLING SCREW
7
FIXED DISK
8
WINDING
9
FAN
10
CAP
11
MAGNETIC CORE
12
SPRING