WARNINGS
A.
Read this bulletin carefully before installing or operating the brakes. Failure to comply
with the installation or operating instructions cancels all warranties and may cause
injury to personnel and damage to property.
B.
DESCRIPTION
The 70 Series brake for hazardous location is a direct acting, electromagnetically
released, spring set brake that utilizes rotating and stationary disc contact to supply
positive braking action. Brakes can be mounted independently of any other equipment
by using a U.L. listed foot mounting bracket, or mounted to an electric motor listed for
hazardous locations. The brakes are equipped with a thermal overload mechanism that
prevents the external surfaces of the unit from exceeding the temperature rating for the
brake.
C.
OPERATING INFORMATION
When the external surface of the brake approaches its temperature rating, the thermal
overload mechanism will automatically release the brake and hold it in the released
position. This prevents ignition of gases or suspended solis, assuming that brake’s
temperature rating is less than the air ignition temperature. The thermal overload
mechanism prevents the surface temperature of the brake from rising to a level that
could ignite the surrounding gases or dusts by releasing the brake and therefore,
stopping a further increase in temperature. Once the brake has been released by the
thermal overload mechanism, control over the rotation of the motor and the load is lost.
This uncontrolled rotation of the motor and movement of the load could cause injury to
personnel and damage to property.
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