If the air gap is wider than permitted, it must be readjusted.

Overview:

As soon as the travel motor stops running, the anchor plate presses against the fan blade with brake lining through spring force, braking the travel motor. This results in an air gap (which can be measured from the outside by means of the reference gap) between the brake bearing shield and the anchor plate. When the travel motor starts up, the magnet body in the brake bearing shield pulls the anchor plate off the fan blade with the brake lining, allowing the travel motor to freely turn.

If the brake lining is worn, the air gap will be larger. See Inspecting the brake on the drive with the helical gear unit. If the air gap is larger than maximally permitted, the brake must be readjusted. The brake lining must also be replaced if it is worn too thin. See Replacing fan blade with brake lining and anchor plate on drive with the planetary gear unit.

   Take off the fan cover.

   Hold the fan blade firmly and screw the self-locking nut until hand-tight. The fan blade should just be tight enough that it almost cannot be turned.

●   The air gap is now set to 0 mm. This serves as the starting point for the following setting.

The self-locking nut is now released in order to optimally adjust the air gap of the brake. The releasing of the self-locking nut is oriented to the individual segments of the fan blade.

   Hold the fan blade firmly and release the self-locking nut by the amount of two and one half segments of the fan blade.

●   The air gap is now set to the optimal width of 0.4 mm.

To make sure, check that the distance between the brake bearing shield and the anchor plate (reference gap) is between 3.1 mm and 3.7 mm. See Inspecting the brake on the drive with the helical gear unit.

   Attach fan cover.