ABB BUL2 Manual de mantenimiento - Página 17

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3.9 Overhaul type BUL2

3.9.1 Disc brake

Run the motor-drive mechanism and check that the center

of the notch in the cam disc stops within ±2 mm from the

center of the roller on the brake arm, see Fig. 9. If it does not

stop within the tolerances, adjust the braking force with the

adjusting screw at the lower end of the brake arm. Loosen

the contra nut. Tightening the screw (clockwise) makes the

stop occur earlier and loosening the screw (counterclockwise)

makes the stop occur later. Tighten the contra nut after the

adjustment.

CAUTION

If the motor-drive still does not stop when the brake

is adjusted to min. 15 mm according to Fig. 9, please

contact ABB for advice.

3.9.2 Position the transmitter and other position switches

Check the contact function in all positions for both RAISE and

LOWER operations.

No adjustment of the contacts should be made.

If there is excessive dust, it can be removed from the circuit

boards and the transparent covers with a vacuum cleaner

without disassembling the multi-position switch.

Cam disc

Fig. 9. Brake adjustment, type BUL2.

3.9.3 Lubrication

Lubrication is not needed under normal operating conditions.

All ball bearings have rubber seals and are permanently

lubricated. All cam discs and some gears are made of self-

lubricating material.

If needed, the gear for the outgoing shaft, the bevel gears

for the hand crank, the Geneva wheels and the bevel gears

for the position indicator can be sparingly lubricated with the

same grease as for the shaft system. (GULF-718EP Synthetic

Grease, Mobilgrease 28, Shell-Aero Shell Grease 22 or

similar). See Fig. 4.

Reconnect the power supplies.

Contact arm

Fig. 10. Check of position transmitter.

Roller on the brake arm in center

of the notch in the cam disc

Brake disc

Brake arm

Contra nut

Adjusting screw

Min. 15

1ZSC000498-ABH en, Rev. 1 | Maintenance guide BUE/BUL2 17

Transparent

cover

Circuit

board