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IV. MAINTENANCE
The Joslyn AC Surge Protector, Model 1456-85-L, requires no scheduled maintenance.
Except for the relay contacts in the monitoring circuit, there are no moving parts. There are
no adjustments to make. Simple electrical tests will indicate the condition of the unit.
The lights on the cover and the remote alarm circuits are used to monitor the condition of the
protector. Proper operating conditions are indicated by the lights being on and the relay
energized. If the lights are off or a remote alarm signal is obtained, one or a combination of
the following conditions exists:
1. The bulbs have burned out;
2. The system voltage is off;
3. Internal fuses in modules have opened;
4. Resistors in the light circuit have opened;
5. Relays are defective;
6. The protector is defective.
If one or more lights are off:
1. Check the system voltage.
2. Replace the bulb if the fuse is intact and the system voltage is on.
If the system voltage is on and the bulb has been replaced and is still not on or a remote
alarm signal is obtained:
1. Measure voltage between monitoring wire terminal (located on side of relay bracket) of
corresponding phase (A, B or C) and neutral. Voltage must read same as supply voltage.
If no voltage can be measured, the module is defective and should be replaced.
2. If modules are operational, the light is on, but a remote alarm signal is obtained, replace
the relay.
3. If light still is not on, a series limiting resistor for the light may be open. Check resistors
for continuity and value.
The following test will determine the condition of the protector modules:
Hazardous voltages are present at the terminals inside the protector.
MAG/MNL145685L(NC)
CAUTION
Test the protector only with the power off.
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