To check the brake, a measurement is made of the air gap between magnet body and anchor plate, as well as the brake lining thickness.

Overview:

Due to the wear of the brake lining as the motor is braked, the brake rotor gradually becomes thinner. The anchor plate is thereby pressed ever further toward the brake rotor during braking and the air gap thus becomes wider. If the air gap has reached its maximum width, a gap limiter prevents the anchor plate from being pressed any further, thus ensuring that the anchor plate is reliably ventilated. When the gap limiter is employed, the braking effectiveness gradually lessens.

This is the point at which the air gap must be readjusted at the latest. If the minimum lining thickness has been reached, 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 air gap must be readjusted now.

    Unscrew the rib screws (3x) of the fan cover.

    Take off the fan cover.

    Remove the O-ring.

    Clean the entire brake with compressed air.

    Insert the feeler gauge next to one of the hexagon head screws in the air gap between magnet body and anchor plate and measure the distance.

    If the air gap has reached the maximum width of the operating range (1.1 mm), adjust the brake. See Setting the air gap on the brake.

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 air gap must be readjusted now.

    Repeat the steps for all hexagon head screws (3x).

    Disconnect the power supply of the magnet body.

    Release the hexagon head screws (3x).

    Pull the magnet body from the motor shaft.

    Pull the brake rotor from the hub and from the motor shaft.

    Check the thickness of the brake lining with a calliper.

    If the brake rotor is thinner than specified in the table: replace the brake rotor. See Replacing the brake rotor on the hoist drive.

The area (air gap) between the magnet body and the anchor plate is protected from dust by an O-ring. The O-ring must not become damaged or lost.

    Check the O-ring.

The O-ring may not be torn, dented or otherwise damaged, nor may it be missing completely.

    If the O-ring is damaged or missing, fit a new O-ring.

    If present: Check whether the O-ring lies fully in the groove of the hub.

    Slide the brake rotor over the motor shaft onto the hub.

    Slide the magnet body onto the motor shaft.

    Screw on the hexagon head screws (3x).

If necessary, replace the hexagon head screws and banjo bolts with new ones.

Ideally, the magnet body should not only be screwed back on, but also the air gap should be readjusted to optimise the operating range of the brake. See Setting the air gap on the brake.

    Connect the power supply of the magnet body.

    Insert the O-ring.

    Attach fan cover.

    Screw in the rib screws (3x) of the fan cover.