ABB BUE Podręcznik konserwacji - Strona 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