Product Manual

18.0 Brake adjustment and maintenance

For normal brake operation, the following requirements must be met:

1. Location altitude must not exceed 2,000 meters (6500 feet) and relative humidity must be under 85%.

2. Brake is free of corrosion or dust.

3. Insulation grade is B, protection grade IP23, and voltage fluctuation remains between +5% and -15%.

4. Surrounding temperature must be between -5 to 40°C (23 to 104°F) and the fricative surface is free

from oil.

5. The air gap must not exceed the maximum limit.

Working principle: The DZS3 magnetic brake is a fricative braking device which automatically engages if there

is a power loss. The brake consists of a magnetic yoke, an exciter coil, springs, a brake lining, and an

armature, a splint sheath, a manual release and fixing bolts. The brake has been installed on the cover plate of

the motor and pre-adjusted to the required gap value.

When electricity passes through the exciter coil, a magnetic field is produced to pull the armature toward the

magnetic yoke, disconnecting the armature and the brake lining to allow the hoist shaft to rotate. When an

absence of electricity occurs, the magnetic field disappears and the armature is released, which results in the

spring pressing against the armature. The armature then asserts a hard pressure on the fricative lining to

produce a braking effect.

Turning the manual release (#5, Figure 18) or tightening the hollow bolt (#2, Figure 18) releases the armature

for adjustment.

Hoist model

1/4T 1/2T, 1T 2T,3T,5T

Rated braking torque (Nm) 8 20 40

Regular working air gap (mm) 0.3 0.4 0.5

Max. working air gap (mm) 1.0 1.0 1.0

Rated voltage 207 V

Table 7

18.1 Brake adjustment

Refer to Figure 18.

1. Turn the hollow bolt (2) into the magnetic yoke

(7) to loosen it.

2. Tighten the fixing screws (8) and use a plug

gauge to verify that the air gap meets the

required value.

3. Turn the hollow bolt (2) so that it is fixed on the

flange plate.

Figure 18

18.2 Periodic maintenance

 The brake lining is wearable and should be

checked every four months to make sure the

air gap remains within normal parameters.

 Check screws regularly to ensure tightness.

 Keep motor fan / brake area clean of dust.