9803 / 7 A
7- Brake/limiter assembly
7-1 Operation
The parts of the limiter are mounted on the gear input shaft
(1). Other brake parts are mounted on the brake cap.
The spring (2) keeps a pressure between the limiter lining
(3) and the brake disc (4).
The nut (5) maintains the assembly on the gear input
shaft.
When the coil (6) is energized, during lifting or lowering, it
is pulled against the anchor disk (7
)
releasing the brake
disk (4)
(there is a play X’for this purpose).
The disks (3 and 4) turn freely, transmitting the movement
to the pinion (8).
Braking occurs when the coil is no longer energized and
the springs (9) drive back the coil and its lining against the
brake disk (4).
7-2 Adjustment of the limiter:
1.
Hook a load of 1.4 times the nominal load onto the
hoist.
2.
Remove the brake endcap and the sealing.
3.
Raise the load at slow and fast speed.
4.
Use a key to turn the adjusting nut (5) in the required
direction.
•
Turn the nut clockwise to increase the torque.
•
Turn the nut counterclockwise to decrease the
torque.
5.
Repeat steps 3 and 4 until the load can barely be
lifted at fast speed. The limiter is now adjusted.
6.
Fit the sealing and the brake endcap.
7.
Check, at fast speed, the lifting of a nominal load.
Note:
That when the limiter is adjusted the brake end cap
must be removed and the motor must be running.
Do no touch the moving components
. Before
pressing the "lift" button on the control box, check
that there is nothing in contact with the adjusting
nut
(key, for example).
7-3 Adjustment of the brake
1.
Before starting the adjustment, remove the load and switch off the power supply.
2.
Remove the brake endcap and the sealing.
3.
Use feeler gauge to measure the air gap (
X’
) between the anchor disk (7) and the electromagnet at at least three points
around the electromagnet.
4. To ajust the brake :
•
Unscrew one of the locking screw (10).
•
Adjust the air gap by turning the adjusting screw (11) counterclockwise to reduce the airgap, clockwise to increase it.
•
Thigten the locking screw (10).
•
Make the same operation with the 2 other adjustment points.
•
Control the air gap adjustment all around the magnet.
5.
Check the operation of the brake
6.
Fit the sealing and the brake endcap
Brake air gap
Minimum air gap
(mm)
Maximum air gap
(mm)
Between anchor disk (7) and coil (6)
X’
= 0.2
X’
= 0.5
Note:
To replace the brake/limiter assembly, the electromagnet supply wires inside the electric box must
first of all
be
disconnected.
