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The Joslyn AC Surge Protector, P/N 1457-40, requires no scheduled maintenance. There are no
adjustments to make. Simple electrical tests will indicate the condition of the unit.
The neon lights on the cover are used to monitor the condition of the protector. Proper operating
conditions are indicated by the lights being lit. If the lights are off or a combination of the
following conditions exists:
a) The bulbs have burned out;
b) The system voltage is off;
c) The external fuses have opened;
d) Internal fuses in modules have opened;
e) Resistors in the light circuit have opened.
If one or more lights are off - -
1. Check the system voltage.
2. Check the fuse.
3. Replace the bulb if the fuse is intact and the system voltage is on.
If the system voltage is on and the fuse is intact, and the bulb has been replaced and is still not on:
1. Measure voltage between monitoring wire terminal (located on terminal block) of
corresponding phase (A, B or C) and neutral. Voltage must read same as supply
voltage. If no voltage can be measured, both modules may be defective and should be
replaced.
2. If light still is not on, a series limiting resistor or wire connection for the light may be
open. Check connections for continuity and resistors for value.
If the fuse is open - -
1. Test the protector modules for dc clamping voltage as noted in the next section.
2. If the module is within specification limits, replace the fuse.
MAG/MNL145740(A)
IV. MAINTENANCE
Joslyn P/N 1457-40
AC Surge Protector
5
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