Operating Instructions – AC Motors DR / DV / DT / DTE / DVE / Asynchrounos Servo Motors CT / CV
41
8
Inspection / maintenance of the brake BR03
Inspection / Maintenance
Inspect brake
BR03, measure
the working air
gap
The working air gap cannot be adjusted and can only be measured by means of the
stroke of the pressure plate when the brake is released.
1. Isolate the motor and brake from the supply, safeguarding them against
unintentional power-up.
2. Unscrew the hand lever [13] (on version with manual brake release), remove the fan
guard and the fan.
3. Remove the self locking counter nuts [16] and, if manual brake release is fitted,
remove the conical coil springs [17] and the releasing lever [14]
4. Measure clearance x (
→
following figure) with the brake at rest:
– From the end of the stud on the pressure plate [8] to the brake coil body [11]
5. Release the brake electrically
6. Measure clearance x with the brake released:
– From the end of the stud on the pressure plate [8] to the brake coil body [11]
7. The differential corresponds to the working air gap, i.e. the stroke of the pressure
plate [18]:
– If the working air gap
≤
0.8 mm, reinstall the conical coil springs [17], releasing
lever [14] and self locking counter nuts [16]
– If the working air gap
≥
0.8 mm, install a complete new brake
– Use setting nuts to set the floating clearance "s" between the conical coil springs
(pressed flat) and the setting nuts (
→
following figure)
Important: The floating clearance "s" is necessary so that the pressure plate
can move up as the brake lining wears. Otherwise, reliable braking is not
guaranteed.
50066AXX
01111BXX
Brake
Floating clearance s [mm]
BR03
2
X
s