16
7.2
Check of the BFK 457-08
The air gap between the magnetic coil (1) and the anchor plate (2) should be checked once a year or if the brake
distance is too long. If the air gap is too large, the brake has to be replaced.
Assembly instructions:
1. Remove the fan cover (4). (Disconnect mains supply before!)
2. Push the thickness gauge between magnetic body (1) and anchor plate (2).
3. Check the air gap S
L
. If the maximum air gap of 0.5 mm is reached the brake has to be scraped and replaced by
a new one.
4. Screw on the fan cover (4).
5.
Function check:
The nominal load must be held securely and braked securely out of motion. The braking should be smoothly.
The brake must be replaced, if the rotor has a thickness of 5.5 mm.
7.3
Assembly of the DC disk brake
Assembly instructions:
1.
Press the hub onto the shaft.
2.
Secure the hub by use of a retaining ring against axial movement.
3.
Assemble DC disk brake to the hub.
4.
Screw the DC disk brake on the gear cover by use of the hexagon screws 3x M5.
5.
Tighten the screws with equivalent torque of 5.5 Nm.
Assembly of the hub onto the shaft
Assembly of the DC disk brake on
the gear cover
Tightening by a torque wrench
Figure 12: Assembly of the DC disk brake
Attention!
For order of spare parts, the complete type designation has to be submitted!
The disassembly should be done in inverted order!
7.4
Faults on the DC disk brake
Troubleshooting and fault elimination
Faults
Causes
Remedy
brake does not
release; air gap is not
zero
coil has contact to ground or
between the windings
Replace the DC disk brake.
wiring wrong or defect
Check wiring diagram and correct wiring
rectifier wrong or defect
Compare wiring of the bridge at rectifier with wiring diagram.
Measure DC-voltage between terminals 5 and 6.
If differences occur change the rectifier.
air gap too large
Replace the DC disk brake.
Table 3: Troubleshooting and fault elimination
If the rectifier defects occur repeatedly, the brake shall be replaced even if no winding short circuit can be detected.
Defect may occur only in warm operating condition.
gear cover
hub
retaining ring
DC disk hub
brake