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

7 Warner Electric • 800-825-9050 819-0041 • P-210
Torque Loss: If a brake or clutch slips or loses
torque completely, the initial check should be
the input voltage to the magnet as follows:
90-Volt Series: Connect a DC voltmeter with a
range of 0-100 or more directly across the
magnet or field terminals. With the power on
and the 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, correct amperage reading for
each coil voltage and unit size are found on
page 5 under Electrical Coil Data. These read-
ings are with the power on and the potentiome-
ter 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 readings are also listed on page 5
under Electrical Coil Data for each voltage and
unit size. 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.