31
To replace the braking unit or one of its parts (elec-
tro-magnet
dp
, mobile armature
dl
, brake disc
dm
,
springs
fl
, it is necessary to remove both the brake
enclosure shield
ds
and the brake cover enclosure
dt
.
A) Disassembly of the brake enclosure shield
ds
Remove the eight screws and remove the brake
enclosure shield taking care not to damage the
coupling joints.
B) Disassembly of the brake cover enclosure
dt
Disconnect the two power wires to the electro-
magnet, remove the eight screws that hold the
brake cover enclosure
dt
to the brake holder
shield
ct
and remove the brake cover enclosure,
taking care not to damage the coupling joints.
C) Replacement of the complete braking unit
Disassemble the brake enclosure shield and the
brake cover enclosure, disconnect the two power
wires to the electro-magnet, remove the rectifier
(only in motors with Ex-de type protection),
unscrew the eight fixing screws (studs)
es
and
remove the braking unit.
Follow the directions in reverse order to mount the
new braking unit. When the brake holder shield
ct
is in place, adjust the air gap with the eight
screws
fk
A
.
D) Replacement of the electro-magnet
dp
Disassemble the brake enclosure shield and the
brake cover enclosure, disconnect the two power
wires to the electro-magnet, remove the rectifier
(only in motors with Ex-de type protection),
unscrew the eight fixing screws of the brake
es
and remove the electro-magnet
dp
.
Follow the directions in reverse order to mount the
new electro-magnet.
When the braking unit is
fastened to the brake holder shield, adjust the air
gap with the eight screws
fk
A
.
E) Replacement of the brake disc
dm
, the mobile
armature
dl
, the springs
fl
Follow the directions given above to disassemble
the brake enclosure shield, the brake cover enclo-
sure, the electro-magnet and the DC/AC rectifier (if
present). Remove the component(s) to be repla-
ced.
Follow the directions in reverse order to mount the
new component, and then the electro-magnet,
being careful to reconnect the electrical wiring cor-
rectly. When the braking unit is fastened to the
brake holder shield, adjust the air gap with the
eight screws (nuts)
fk
A
.
F) Replacement of the encoder and/or micro-
switch (optional - figure 4D)
If the electric motor is fitted with an encoder and a
micro-switch to signal whether the brake is open
or closed, these parts are installed inside the
brake cover enclosure.
f1)
To replace the encoder
N
, first remove the eight
screws and the brake enclosure shield
ds
taking
care not to damage the coupling joints.
Disconnect the encoder’s power wires (normally 9
wires) from the terminal box
M
inside the brake
enclosure.
Remove the fixing screw between the encoder
and its anti-rotation plate
L
.
Loosen the encoder fixing screw on the motor
shaft and remove it manually.
Follow the directions in reverse order to reassem-
ble the piece.
4.6 Adjusting the braking torque and
replacing the braking unit and/or
its parts for motors 180÷315
E
N
G
L
IS
H
dm
ct
fk
A
es
fl
et
dq
dt
ds
dl
dp
Fig. 4C
Size
180÷315
