Warner Electric Electro-Brake 375, 475, 650, 825, 1000, 1225 - Manual (Page 7)

7 Warner Electric • 800-825-9050 P-211 • 819-0043
potentiometer turned up, a normal reading is 90
volts, although 85 to 95 is satisfactory. The
reading should drop as the potentiometer
control is adjusted counterclockwise.
24-Volt Series: Use a DC voltmeter with a range
of 0-30 volts or more. A normal reading is
approximately 22-26 volts.
6-Volt Series: Use a DC voltmeter of
approximately 0-15 volt range. A normal reading
is from 5.5 to 6.5 volts.
The above checks normally are sufficient.
Further checks may be made as follows: a low
range ammeter, when connected in series with
one magnet lead, will normally indicate
approximately .40 amperes for the 90 volt units,
1.0 ampere for the 24 volt, and 3.5 amperes for
the 6 volt series. These readings are with the
power on and the potentiometer control in the
maximum position.
Ohmmeter checks should be made with the
power off and the circuit open (to be certain,
disconnect one lead to the magnet). Average
resistance for the 90 volt series is 220 ohms; for
the 24 volt, 20 ohms; and for the 6 volt series,
1.5 ohms. A very high or infinite resistance
reading would indicate an open coil.
If the above checks indicate that the proper
voltage and current is being supplied to the
magnet, mechanical parts should be checked to
assure that they are in good operating condition
and properly installed.