Warner Electric ER 825 and 1225 Heavy Duty - Manual (Page 8)

8 Warner Electric • 800-825-9050 P-251 • 819-0121
When the brake armature cannot be visually
observed during brake voltage adjustment, an
ohmmeter can be used to determine when the
armature disengages. One ohmmeter lead should
be attached to the armature itself, in a manor not
to obstruct the movement of the armature the
other to the machine base. The release point can
be determined as follows:
Put machine in a safe
condition so that when voltage is applied to
control and switch closures are made the
brake does not rotate and machine does not
run.
1. The brake is engaged when the armature
contacts the magnet, causing very low resistance
(less than one ohm).
Section IV
Ohmmeter Procedure to Detect Armature Release
MCS-805-1 and MCS-805-2 Power Supply
Dimensional Drawings and Mounting Provisions
2. The brake is disengaged (released) when the
ohmmeter indicates higher resistance (usually
greater than one ohm—may be as high as 10,000
ohms).
The difference between ohmmeter readings 1 and
2 must be large enough to reliably indicate
armature engagement or disengagement. Reliable
readings can usually be obtained from a brake
mounted on a shaft running on antifriction
bearings.
Coil Data
Unit Current Draw (amp) Resistance (ohms)
Size at 60 Volts D.C. at 20°C (±10%)
ER-825 .308 195
ER-1225 .256 235
0.875 Diameter Knockouts
for 0.50 Conduit
Both Ends Typical
0.28 Diameter
(4) Mtg Holes
Clearance for
.25" Screw
TOP AND BOTTOM
FRONT SIDE BACK
3.44
2.625
1.125
7.125
5.0 3.44
0.56
6.0
4.81
5.0
3.75 0.53