Warner Electric General Trouble Shooting - Manual (Page 2)

Voltage Check
The initial electrical check should be the input
voltage to the magnet, as follows:
For 90 volt units connect a DC voltmeter with a
range of 0-100, or more, directly across the
magnet terminals. With the power on the
potentiometer turned up, a normal reading is 90
volts, although 85 to 105 is satisfactory. The
reading should drop smoothly as the
potentiometer is turned counterclockwise.
For 6 volt magnets use a DC range on the
voltmeter of approximately 0-15 volts. A normal
reading is from 5.5 to 6.5 volts, depending on
the power supply.
Current Check
A low range ammeter, when connected in series
with one magnet lead, will normally indicate
approximately .35 amperes for the 90 volt IHP
units and 4.0 amperes for the 6 volt series. These
readings are with power on and the potentiometer
control in the maximum position.
Resistance Check
Ohmmeter checks should be made with the
power off and the circuit open (to be certain,
disconnect one magnet lead). Average resistance
for the IHP 90 volt series is 250 ohms; for the 6
volt series, 1.5 ohms. A very high or infinite
resistance reading would indicate an open coil.
Summary
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.
Unit Size SF/PB 120 SF/PB 170 SF/PB 250
Voltage – DC 6 24 90 6 24 90 6 24 90
Resistance @ 20°C – Ohms 6.32 104 1386 6.96 111.2 1506 5 76.4 1079
Current – Amperes .949 .230 .065 .861 .215 .060 1.2 .314 .084
Watts 5.69 5.52 5.85 5.85 5.16 5.37 7.2 7.5 7.51
Coil Build-up – milliseconds 12 12 11 17 17 16 48 48 44
Coil Decay – milliseconds 8 8 7 8 7 6 15 15 13
Unit Size SF/PB 400 SF-500 PB & PC 500 SF-650
Voltage – DC 6 24 90 6 24 90 6 24 90 6 24 90
Resistance @ 20°C – Ohms 4.88 73 1087 1.076 14.9 206.1 1.36 23.8 251.1 1.16 17.7 225
Current – Amperes 1.23 .322 .083 5.58 1.61 .44 4.4 1.01 .36 5.19 1.36 .4
Watts 7.39 7.96 7.45 34 39 39 26 24 32 31 33 36
Coil Build-up – milliseconds 154 154 154 82 85 90 84 87 93 110 115 120
Coil Decay – milliseconds 62 60 55 40 40 40 38 35 30 50 50 50
Unit Size PB-650 SF-825 SF-825 Brg PB & PC 825 SF-1000 PB & PC 1000
Voltage – DC 6 24 90 6 24 90 6 24 90 6 24 90 6 24 90 6 24 90
Resistance @ 20°C – Ohms 1.24 18.3 257.2 1.23 20.9 267.0 1.098 14.6 221 1.27 20.4 223.3 1.07 14.4 214.4 1.23 19.7 248.7
Current – Amperes 4.84 1.31 .35 4.9 1.15 .34 5.464 1.65 .407 4.74 1.18 .4 5.61 1.67 .42 4.87 1.22 .36
Watts 29 31 32 29 28 30 33 40 37 28 28 36 34 40 38 29 29 33
Coil Build-up – milliseconds 100 105 110 222 200 245 180 200 225 170 170 170 256 275 283 205 220 235
Coil Decay – milliseconds 50 50 50 105 120 100 115 120 130 70 75 80 123 105 90 70 75 80
Unit Size SF-1225 PB & PC 1225 SF-1525 PB & PC 1525 SF-1525 H.T.
Voltage – DC 6 24 90 6 24 90 6 24 90 6 24 90 6 90
Resistance @ 20°C – Ohms 1.21 19.5 268.3 1.33 22.3 261.7 1.11 15.5 239.1 1.45 19.8 258.4 55 113.4
Current – Amperes 4.97 1.23 .34 4.5 1.08 .34 5.41 1.55 .38 4.13 1.21 .35 10.83 .794
Electrical Troubleshooting
Coil Data
Warner Electric • 800-825-9050 P-233 • 819-0451 2