Page 33 of 36 A80H0321
Verify that the brake coil functions correctly; when the brake is energized, the brake coil (25) should attract the brake
moving element (24) with a quick stroke, and hold it without any vibration or noise. In case of any vibration, check
that terminal connectors are coupled correctly and tightened.
Brake adjusters replacement
Remove the brake cover (26)
as described in the relevant paragraph.
Take off the brake coil (25) from the brake
adjusters (19), remove the nuts (20-21) and the springs (18).
Remove the brake moving element (24) sliding it through the brake adjusters (19), remove the old brake adjusters and
screw the new ones verifying their steady fastening on the rear cover brake surface (17).
After having screwed each brake adjuster (19 or 42) it's necessary to check that its support bottom is completely
leaned on the rear cover brake surface (17).
For information on the right brake adjusters tightening torque please contact us.
Air Gap Adjustment
The air gap (60) i.e. the distance between the two magnetic cores of the brake coil (25) and the brake moving element
(24), must be as shown on table 1.
It's strongly unadvisable to exceed these values in order to avoid vibrations of the brake moving element, prominent
noise, the burning of the brake coil or the brake assembly damaging.
It's advisable to check periodically the air gap. Because of the wear of the brake disc linings air gap, tends to increase.
Please note that brake linings wear is greater during the run-in (few thousands stops).
In order to set the airgap back to the required value, operate on the nuts (21-22) in order to move the brake coil (25)
towards the brake moving element (24). It's strongly recommended to avoid to tighten the locknut (22) located on
one brake adjuster (19) before having completed the positioning of the brake coil (25) on all the brake adjusters.
Therefore don't regulate the position of the brake coil adjusting the nut (21) on one brake adjuster, if previously you
haven't loosen the locknuts (22) on all the brake adjusters (19). This wrong operation could stress the air gap adjusters.
Please verify that the airgap is uniform. The air gap must be uniform to guarantee a correct functioning and avoid
mechanical stresses due to a misalignment.
When the air gap adjustment has been settled, the locknuts (22) should be tightened. For brake assembly with 6 brake
adjusters (19), as first step regulate the brake coil position only on three brake adjusters at 120° by working on the
nuts 21-22. After having adjusted the position on these 3 brake adjusters, to complete the operation go on with the
other 3 brake adjusters and first bring the air gap adjusting nuts (21) close to the brake coil and then tighten the
locknuts (22).
When the operation has been settled, verify that the airgap is uniform and the nuts (21-22) are tightened.
Motor type
80
90-100
112
Air gap range (mm)
0.25÷0.6
0.3÷0.7
0.35÷0.8
Table 1
The airgap must be as indicated on the table 1. Don’t exceed this range to avoid
any damage on the brake assembly.
