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BL5x-MT-EN-13
page
42/56
5.3.
Safety torque limiter adjustment
The torque limiter is a safety device and is factory-adjusted. However, some further adjustment may be
necessary when the equipment has been installed or after a certain time of operation. Proceed with the
adjustment in the following cases:
--
Either the barrier arm does not open easily when a closing movement is reversed. The friction clutch
then slips and must be tightened.
--
Or the force needed to block the arm by hand during a closing or opening movement is too strong.
The friction clutch then sticks and must be loosened.
--
Or after a balance adjustment with the spring.
In either case, the state of the V-belt must first be checked according to paragraph
[5.2 Belt tension
adjustment]
. Then proceed as follows:
18:2
18:1
--
Loosen the 8 lock nuts (
18:1
).
--
Tighten the 8 screws (
18:2
) to tighten the torque limiter, untighten them to loosen it.
--
Switch on the main circuit breaker (
4:1
)
--
Make an electrical opening/closing test by pushing the button OK (
5:
4
), and repeat the procedure
above until the desired result is obtained. Never forget to first switch off the equipment.
--
When the adjustment is completed, switch off the main circuit breaker (
4:1
)
Attention
:
Proceed smoothly by 1/8th of a turn successively, since the adjustment is very sensitive. When
the adjustment is completed, do not forget to tighten the 8 lock nuts (
18:1
) firmly again.
IMPORTANT: Excessive tightening of the clutch may damage the gearbox!
To test the torque limiter adjustment, proceed as follows:
--
Arm the overload protection of the barrier by switching on the circuit breaker (
4:1
).
--
Open the barrier arm electrically to an angle of 90° by means of the button OK (
5:4
).
--
Close it electrically again by pushing the button OK (
5:4
).
--
Reverse the movement when the arm is half-way (angle of 45°).
--
By slipping slightly, the torque limiter must absorb the inertia of the arm (NOT A/THE V-BELT!).
--
When the check is completed, switch off the circuit breaker (4:1).