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BL5x-MT-EN-13
page
40/56
5.2.
Belt tension adjustment
The tension of the belt must be adjusted after replacement or after a certain time of operation, or when all
the motor power cannot be transmitted to the mechanism. As a consequence, the belt slips on the pulleys
and there is a formation of black dust. Proceed as follows to check the tension and/or replace the belt.
--
Arm the overload protection by switching off 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 THE V-BELT!).
--
If necessary, adjust the belt tension as follows, after switching off the circuit breaker (
4:1
)
Loosen slightly the four screws (
17:1
) that fix the motor.
If required, slide the motor downwards in its guides (
17:2
), remove the old V-belt and fix the new
one.
Slide the motor upwards in its guides. The tension is properly adjusted if the belt can be
depressed about 10mm when you push on it as illustrated in Fig. 17.
Make sure that the motor is horizontal.
Tighten the four screws (
17:1
) firmly again.