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

2 Warner Electric • 800-825-9050 P-250 • 819-0122
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . 3
Section I - Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Section II - Controls for ER-825 Brakes . . . . . . . . . . . . . 5
Section III - Controls for ER-1225 Brakes . . . . . . . . . . . 5
Section IV - Disassembling . . . . . . . . . . . . . . . . . . . . . . 8
Section V - Ohmmeter Procedure . . . . . . . . . . . . . . . . . 9
Section VI - Operating Instructions. . . . . . . . . . . . . . . . 10
Dimensions & Specifications . . . . . . . . . . . . . . . . . . . . 12
Bushing Part Numbers. . . . . . . . . . . . . . . . . . . . . . . . . 13
Component Parts List & Exploded View. . . . . . . . . . . . 14
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . back cover
ER-1225
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.
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.
Failure to follow these
instructions may result in product damage,
equipment damage, and serious or fatal
injury to personnel.