PREVOST BAL-F Manuel D'utilisateur page 10

Changing the load/ Changing the tool
Before proceeding with the tool change, it is necessary to rewind completely the balancer rope without using the
stroke adjustment
device as a locking device.
Should the balancer be provided with locking devices, it is also possible to proceed as follows:
- Activate the lock (visible red indicator or closed padlock).
- Unhook the load from the balancer
- Hook the new load; bring it to a vertical position below the balancer with the rope stretched.
- Adjust the balancer, if needed, to balance the new load (when the new load has a different weight).
Safety devices
Drum spring breakage
The balancer is fitted with a safety device that trips when the drum spring breaks and stops the balancer to prevent
the hanging load from falling.
If the hanging tool cannot be lifted or lowered through ordinary strain, DO NOT INSIST but contact customer service.
NOTE: the balancer stops even if the drum spring is fully discharged: in this condition the head of the
charge screw 45 (Fig.5) protrudes approximately 4 mm outside the cap. To restore operating conditions,
use the lever 4 (Fig.6) and try to charge the spring as outlined in paragraph "Balancer adjustment"
(release lever 4 when the head of the charge screw has re-entered the cap). If the balancer does not
release, DO NOT do anything and contact customer service.
Centrifugal speed limiter
The balancer is fitted with a centrifugal safety system that locks the drum if the speed exceeds the danger limit
(accidental unhooking of the load, cable breakage, etc.). If the centrifugal safety system trips, discharge the drum
spring IMMEDIATELY and completely, and have the balancer inspected by an authorized service center.
Manual lock
The balancer is fitted with a manual-locking system (Fig.4): turn the knob 1 to position H to stop drum rotation.
Turn the knob 1 to position G for routine work conditions.
NOTE: for safety reasons, the shape of the shutter that stops the drum does not allow the shutter to be
removed unless it is perfectly coaxial with the matching hole in the drum: to release the drum, move
the load slightly at the top and at the bottom until you find the correct position in which to release it.
OPTION 'B': control from below (Fig.2)
Lower the side of the handle with the RED tape to lock the drum; lower the side of the handle with the GREEN
tape to release it.
WARNING: do not leave the balancer with the drum locked and no hanging loads.
WARNING: if the balancer's cable is not fully wound, and no load is applied to it,
DO NOT do anything but contact the customer service at once.
OPTION "RI", insulated rotary suspension (Fig.3)
Permits to insulate the load hung on the balancer and/or turn the hanging tool freely without twisting the cable.
WARNING: always comply with the safety regulations when using electrical appliances.
Installation: insert the snap-hook (31) into the pin E of the rotary suspension. Insert the cable's thimble (14)
into the pin F; insert the split-pin (D) and deform it.
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