Only for four-pole hoist drive with frequency converter
This section only applies if the wire rope hoist has a four-pole hoist drive with frequency converter.
The air gap between the magnet body and the anchor plate must be measured to check the brake.
The air gap on the brake is measured through an opening in the side of the brake. The brake does not have to be disassembled.
The pictures show the procedure on a GM 1000 modular wire rope hoist. The procedure on GM 800 does not differ significantly from this.
Overview:
|
Air gap (between magnet body and anchor plate) |
Brake lining thickness |
|
| |
|
Magnet body and anchor plate |
Brake rotor with brake lining |
|
Dimension |
GM 800 |
GM 1000 |
|
Maximum air gap |
0.7 mm |
0.7 mm |
|
Air gap when new |
0.2 mm |
0.2 mm |
If the air gap is wider than permitted, the brake rotor must be replaced.
If the width of the air gap is within the permitted range but usage behaviour leads to the expectation that the air gap will be wider than permitted before the next regular inspection, the brake rotor must be replaced now.
Remove the screws on the fan cover.
Pull the fan cover off to the rear.
Pull the sealing plug off the brake.
Measuring the air gap
|
|
Opening in the brake |
|
| |
|
Feeler gauge |
|
Push the feeler gauge at least 30 mm into the air gap from the
side.
If the air gap is wider than 0.7 mm: Replace brake rotor. See Replacing the
brake rotor on the hoist drive.
The air gap on the brake cannot be adjusted or readjusted.
Attaching the fan cover
Push the sealing plug into the opening on the brake.
Attach the fan cover.
Screw the fan cover in place by hand.