DYNAMICS GROUP Dings 8-61001-66B Anleitung Handbuch - Seite 3

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The thermal overload mechanism can be reset manually after a cooling off period. Before

resetting, the cause for actuating the thermal overload mechanism should be removed.

To minimize the possibility of overheating the brake to a point where the thermal overload

mechanism will be actuated, the performance of the brake has to be matched to the requirements

of the application.

When selecting the brake model, consideration has to be given to brake torque, thermal

capacity, electrical power supply, housing material and any unusual conditions.

BRAKE TORQUE

As a general rule, brake torque is matched to the full load motor torque (brake and motor shaft

at the same speed). Depending on the type of application, the torque sometimes is increased by

a safety factor of 1.5 to 2. If factors such as stopping time, travel distance during stopping and

others, are important, the exact torque requirement has to be calculated, using the inertia and

speed of all moving parts.

THERMAL CAPACITY

Thermal capacity describes the capacity of the brake to perform the maximum number of

stops without excessive heat buildup that will actuate the thermal overload mechanism or

damage internal brake parts. The maximum number of stops depends on the rating of the brake,

inertia to be stopped and speed from which stops are made. To calculate the thermal capacity

requirements of the application, inertia and speed of all moving parts and the number of stops

of one full operating cycle must be known.

ELECTRICAL POWER SUPPLY

The coil of the electromagnet, which supplies the releasing force under normal operating

conditions, will operate properly with a tolerance of plus or minus 10% of rated voltage. A volt-

age higher than 110% will shorten the life of the coil considerably due to the higher

temper-

ature generated inside the coil. A voltage of less than 90% may prevent the armature from mov-

ing towards the magnet frame. If this occurs, the coil will burn out within months.

HOUSING MATERIAL

The 60 Series H.L. brake is available with an aluminum or cast iron housing. The selection

depends on the environment. Certain vapors or liquids prevent the use of the lighter aluminum

housing.

UNUSUAL CONDITIONS

Please consult Dings Home Office, if ambient temperature is above 40 o C (104 o F), brake shaft

speed is over 3600 RPM, or any other unusual conditions exist.