Warner Electric PB-1525 - Manual (Page 7)

7 Warner Electric • 800-825-9050 P-209 • 819-0517
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 approximate-
ly 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 mag-
net lead, will normally indicate approximately .40
amperes for the 90 volt units, 1.0 ampere for the
24 volt, and 3.5 amperes for the 6 volt series.
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 for the
90 volt series is 220 ohms; for the 24 volt, 20
ohms; and for the 6 volt series, 1.5 ohms. A very
high or infinite resistance reading would indicate an
open coil.
If the above checks indicate that the proper volt-
age and current is being supplied to the magnet,
mechanical parts should be checked to assure
that they are in good operating condition and prop-
erly installed.