Warner Electric ER 825 and 1225 Heavy Duty - Manual (Page 2)

2 Warner Electric • 800-825-9050 P-251 • 819-0121
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Controls Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Ohmmeter Procedure to Detect Armature Release . . . . . . . . . . . .8
Coil Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
MCS-805-1, MCS-805-2 Mounting Dimensions . . . . . . . . . . . . . .8
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Dimensions and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . .11
Bushing Part Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .BC
T
his service manual tells how to install, adjust, and maintain your Warner Electric brake. It also
contains information for part replacements when needed.
Warner Electric Electrically Released Brakes are high performance, high torque units. To obtain the
required performance and life, the brake must be installed exactly in accordance with the instructions
in this service manual.
The Warner Electric warranty does not apply to any unit which is not installed, used, operated and
maintained in accordance with Warner Electric's instructions.
ER-825 and ER-1225
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 opposition to and cancellation of
electromagnetic force which releases the brake
occurs nominally at one value of ampere turns.
This ampere turn value can vary among brakes
because of allowable manufacturing tolerances.
Release voltage varies mainly because of 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 of the brake.
Ceramic permanent magnets, which are the heart
of Electrically Released Brakes, are not subject to
fatigue losses, therefore, Warner Electric
Electrically Released Brakes are self-adjusting.
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.