ABB BUL2 Manual de mantenimiento - Página 15
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CAUTION
If the motor-drive still does not stop when the brake is
adjusted to a spring length of 35 mm when the brake
is fully open, please contact ABB for advice.
3.8.2 Brake for the holding contact
Check that the brake for the holding contact prevents the arm
system on the holding contact shaft from swinging beyond its
normal position when the roller on the drive arm moves free
from the cam disc; see Fig. 2. At the end of the operation,
contacts for operation in the opposite direction should not
move when the arm system swings back towards its normal
position.
Unpermitted swinging should be prevented by raising the
braking force, i. e. tightening the spring bolt.
An adjusted, increased spring force on the brake makes the
holding contact arm swing back with a different speed, and
the brake for the holding contact must be adjusted.
Fig. 7. Contact arm play.
Moving contact
Contact arm
+0.3
0.8
mm
-0.3
Fixed contact
3.8.3 Position transmitter and other position switches
Clean the contact plates and arms (Fig. 7) from dust and dirt
with a dry cloth.
Check and adjust the resilience of the moving contacts in
the multi-position switches. The moving contact shall in all
positions, have a clearance between the nut and the contact
arm of 0.5–1.1 mm. Adjustment is made with the nuts on the
contact.
3.8.4 Lubrication
See Fig. 8. The bearing points of the brake blocks and the
links should be sparingly lubricated with oil. (Use oil for plain
ball and roller bearings.)
The spur gears, the Geneva wheel with the limit-stop, the
cam discs, the cam bar and the big wheel attached on the
outgoing shaft, are sparingly lubricated with the same type of
grease as for the shaft system when necessary.
Other bearing points do not need lubrication.
Protect the brake disc and the brake linings against
lubricants. Wipe off excess lubricant.
Reconnect the power supplies.
View A – A
1ZSC000498-ABH en, Rev. 1 | Maintenance guide BUE/BUL2 15
Contact arm
Geneva wheel
Contact plate