Warner Electric SFP-400 - Manual (Page 4)

4 Warner Electric • 800-825-9050 P-231 • 819-0382
Specifications
Model Static Torque Max. RPM
SFP-250 70 lb.in. 7500
SFP-400 270 lb.in. 5000
Coil Ratings
SFP-250 SFP-400
Voltage–DC 6 24 90 6 12 24 90
Resistance 20˚ C–OHMS 5.0 6.4 1079 2.08 8.41 33.73 474.2
Current–Amperes 1.2 0.314 0.08 2.888 1.426 0.711 0.190
Watts 7.2 7.5 7.51 17.3 17.1 17.0 17.1
Troubleshooting
If the clutch does not engage, slips, or loses
torque, the most likely cause is worn out friction
surfaces and the clutch should be replaced. If
excessive wear is not the cause, first check the
input voltage to the coil. Use a DC voltmeter to
check the voltage across the terminals with the
power on and the control turned all the way up.
For 90 volt units, the reading should fall within
the 85-95 volt range. For 24 volt units, 22-26
volts is normal.
Current and resistance checks can be made if
necessary. Connect a low range ammeter in
series with one coil lead. With maximum power
supplied, the current reading should
approximate the data in the coil ratings table. To
check the resistance, use an ohmmeter with the
power off and the circuit open. If a very high or
infinite resistance is indicated, the coil is open
and the clutch should be replaced.
If the above checks indicate that the proper
voltage and current are being supplied to the
magnet, mechanical parts should be checked to
assure that they are in good operating
condition, free of contamination and properly
installed.