Mitsubishi Electric UM 5t Instruction Manual page 28

Braking plate
ction
(5) Fit a new brake disk to the motor shaft or the brake gear. Lightly turn the brake disk
clockwise and counterclockwise with your hand to check for backlash.
CAUTION! : Even after replacing the brake disk with a new one, if the backlash is too large,
judge that the brake gear is worn out. Use of the worn brake gear may damage
the braking plate due to the shock at starting or stoppage. For this reason, be
sure to replace the worn brake gear. The brake gear is tightly engaged with
the motor shaft by the involute serration. Use a tool to remove the brake gear.
(Use two threaded holes (size: M8) for removal of the brake gear.)
Before reassembly, be sure to fill the inner groove with Moly PS grease No. 2.
(6) After inserting the retaining springs, fit the adjusting ring into the deeper side (upper side) of
the eccentric groove of the pressure plate. After that, attach the movable iron core to the
adjusting ring, and then tighten the movable iron core using the assembly bolts. Use the lid
clamping bolts as the assembly bolts.
(7) Mount the assembly in the brake casing. Make sure that the adjusting ring is located upward.
If the ring is not located correctly, it will not automatically adjust the gap.
(8) Before fitting the stationary core, make sure that the clearance between the adsorbing surface
and the center is in the range from 0.1 to 0.3 mm. If the clearance is less than 0.1 mm and
almost 0, replace the core.
CAUTION! : If the clearance is less than 0.1 mm (almost 0), the braking operation may be
delayed and the braking distance may be elongated.
Pressing plate
Brake disk
Retaining spring
Motor shaft
Brake gear
DC electromagnetic brake
Electromagnetic
brake casing
Movable core
Adjusting
Stationary core
ring
Brake coil
(Assembly bolt)
Packing
－24－
Helical compres-
sion spring
Lid