Manual

9
Warner Electric • 800-825-9050 P-201 • 819-0485
If the friction materials have been saturated
with oil or grease, no amount of cleaning will be
completely effective. Once such a unit has been
placed back in service, heat will cause the oil to
boil to the surface, resulting in further torque
loss.
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 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:
Connect a low range ammeter in series with
one magnet lead. Correct amperage readings
for each coil voltage and unit size are found on
page 5 of this manual.
These readings are with the power on and
condition control in the maximum output volt-
age.
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 of
this manual. 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.