User`s manual
35
11 Clutch mobile disk
12 Hoisting motor
DESCRIPTION
OF
BRAKE
FUNCTIONING:
When the core (3) is fed, magnetic force overcomes the action exerted by the springs (4), attracts the keeper (2) which
disengages the disk (6) and enables the shaft (1), which is dragged by the clutch, to rotate freely.
Upon power supply failing, the keeper detaches due to the action of the springs and generates a pressure on the fixed disk (5) thus
blocking, through the hub (1), the rotation of the shaft that is connected to the reducer.
DESCRIPTION
OF
CLUTCH
FUNCTIONING:
The motor shaft (12) transmits its torque through the pressure exerted by the springs (10) between the body (9) and the disk (11) and
the slotted hub (1).
Springs’ power and number are calculated so as to allow the transmission of a torque equal to the nominal torque of the motor
increased by 25% - 60%.
As a result, in case of loads exceeding the one which the hoist can tolerate, the clutch will skid thus preventing all the mechanical
members below from undergoing abnormal stress.
This particular clutch guarantees a double protection for both the hook at minimum height and the overload on hoisting.
The clutch should only be used for brief periods of time (1 or 2 seconds) in order to avoid wear or overheating.
PERIODIC
CHECKS
OF
THE
BACO
UNIT
After a year of service or in the event of poor braking it is advisable to verify the degree of wear and tear of the brake disk (6). Separate
the motor/clutch unit by working on the screws (8), remove the fixed disk (5) and check the degree of wear and tear of the brake disk
and the springs’ (4) functionality. Replace if the thickness of the disk’s braking band is less than 5 mm. Simultaneously to this
operation, verify the degree of wear and tear of the clutch by untightening the screws (7) and removing the locking ring.
For the clutch too, the friction surface minimum thickness should be 5 mm or higher.
CLUTCH
SETTING
a) Discontinue power supply to the motor by acting on the
main line disconnecting switch.
b) Remove the lid from the motor fan
c) Remove the plastic cap located in the BACO’s neck
d) Introduce a 4 mm hexagonal wrench (14) into the hole
e) Using the fan, rotate the motor shaft in one direction till the
hexagonal wrench fits into the screw seat (13). Unscrew
the screw approx. two turns.
f) Using the hexagonal wrench, keep the BACO’s rotor still
and rotate the motor a few degrees by means of the fan.
Rotating the motor clockwise decreases the torque.
Anti-clockwise rotation increases the torque.
g) Tighten the screw back (13)
h) Pull the wrench out. Connect the hoist to the power supply
with great care (mind the fan) and run a test
i) If the result does not meet the requirement, start again from
a) till the required setting is achieved.
j) In the event of particular needs and settings, We would like
to remind you that YoYo hoists can be equipped with
“Motor-Sentry” electronic load limiter acting on the motor’s
ammetric absorption. In this case, the BACO will act as a
limit switch only.