Warner Electric Electro Packs EP-170-C, EP-250-C - Manual (Page 3)

3 Warner Electric • 800-825-9050 819-0357
The Electro Packs operate on DC power. Warner
Electric offers a full line of AC powered DC output
controls to meet the needs of almost every
clutch/brake application. The service and
installation instructions included with each Warner
Electric control show the proper connections.
Please refer to Figure 1 for typical Electro Pack
electrical connections. The lead wires on the EP-
170-C are identified with a "C" for clutch and a
"B" for brake. Polarity is not important when wiring
Electro Pack units.
Figure 1
Burnishing
The ceramic faced friction surfaces of these
Electro-Packs are preburnished and performance
tested at the factory to ensure consistent "out of
box" performance. Therefore, no "wearing-in," or
burnishing, is required.
C
C
B
B
Clutch/Brake
Control
DC
Voltage
Clutch
Brake
AC
Voltage
Input
Output
Maintenance
Wear Pattern: Wear grooves appear on the
armature and magnet surfaces. This is a normal
wear condition and does not impair proper
functioning of the unit.
Heat: Excessive heat and high operating
temperatures can cause Electro-Pack failure.
Units, therefore, should be ventilated as efficiently
as possible, especially if the application requires
fast, repetitive cycle operation.
Foreign Materials: When units are used near
gear boxes or transmissions requiring frequent
lubrication, means should be provided to protect
the friction surfaces from oil and grease to prevent
serious 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 above. 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