Warner Electric ER-1225 - Manual (Page 3)

Warner Electric • 800-825-9050 819-0466 3
This ampere turn value can vary among brakes
because of allowable manufacturing tolerances .
Release voltage varies mainly because of the
coil tolerance and Autogap® spring variations .
Properly adjusting the power supply voltage is
important so the autogap springs will separate the
magnet and armature, causing full release . If the
release voltage is not set properly, the armature
will rub against the magnet . This rubbing action
can cause the brake and other components in the
system to fail . Warner Electric Electrically Released
Brakes are burnished at the factory to assure
rated torque shortly after initial application . Very
little additional wear-in is required .
Introduction
Warner Electric Electrically Released Brakes
function on the same principle of “response to
magnetic attraction” that operates other Warner
Electric brakes and clutches . Braking torque in
the Electrically Released Brake depends on
permanent magnets rather than electromagnets .
With the power off, the unit produces full braking
torque . The brake is released by reversing the
direction of flux flow in an electromagnetic coil,
thus opposing the field produced by the
permanent magnets .
The cancellation of electromagnetic force which
releases the brake occurs at one nominal value
of ampere turns .
The same principle of “response to magnetic attraction” used in this FB-650 operates the larger ER-825
and ER-1225 Electrically Released Brakes Described in this manual
Autogap®
Assembly
Poles
Friction
Material
Armature
Coil
Permanent
Magnets
Magnet
Shell