7
INSTALLATION AND MAINTENANCE
GEARLESS Z2 - Z3
A.C. Drive for elevators
LEROY-SOMER
3862 en - 07.2004 / a
6 - BRAKE ADJUSTMENT
PROCEDURE
6.1 - Air gap adjustment tolerance
6.2 - Checking and adjusting the air gap
(brakes de-energised)
6.2.1 - Check the brake air gap
1 - Measure the air gap using a set of adjustment shims at the
points indicated (between the armature and the brake
housing).
2 - The brake is correctly adjusted if the air gap is between
0.25 and 0.3 mm (factory setting).
6.2.2 - Adjusting the brake air gap
1 - Unlock and loosen the lock nuts on the brake adjustment
screws.
2 - Insert two 0.25 mm adjustment shims in the air gap at the
points indicated (in order to avoid the antivibration mounts
and the springs).
3 - Re-tighten the adjustment screws alternately, so that the
shims slide in easily.
4 - Tightly re-lock the lock nuts on the adjustment screws
while firmly holding the adjustment screws.
5 - After adjusting the air gap, the adjustment must be
checked (section 6.3) and if necessary, the microswitches
adjusted (section 6.4).
6.3 - Checking the adjustment of the air
gap (with the brakes energised)
1 - Energise the brakes.
2 - Check the level of noise of each brake (no rattling) and
ensure that the pulley rotates freely with the brakes released.
If there is too much noise, re-adjust the brake using 0.20 mm
shims.
3 - After this operation, it is essential to check the adjustment
of the microswitches.
6.4 - Checking and adjusting the
microswitches
- Each brake calliper has a microswitch.
- The microswitches are closed when the brake is engaged
(active).
- The microswitches are wired in series (if there are several
brakes).
1 - Check the microswitches using an ohmmeter.
2 - Check each microswitch in succession after short-
circuiting the others. The check is carried out by activating the
brake several times (releasing/engaging) at a minimum of
3 equidistant points during one complete rotation of the brake
disk.
3 - The adjustment must be carried out with the brake
energised (released).
- using the M6 grub screw (diagram below) and the lock nut,
which is lightly tightened, adjust the screw, then retighten until
it is firmly fastened. Then tighten one further half turn and lock
the lock nut.
4 - Check sections 1 and 2
5 - Perform the same operation on the other microswitches
Prohibited
0.1 mm
0.2 mm
0.3 mm
0.4 mm
0.5 mm
Prohibited
Modification of the air gap by adjustment
Set of shims for
adjusting the air gap
Brake lining
pads
Air gap
adjustment
screw
Brake
disk
Lock
nut
Travel
measurement,
detection screw
Nut
Air gap
Screw
Microswitch
