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The IS Relays are not switching correctly - Check
1. Has the correct type of relay been specified?
2. Has the relay polarity been connected correctly for both the coil and the contact
connections?
3. Check the annunciator card by replacement
Routine maintenance
1 Keep the system free from dust and clean the front fascia and any plastic
labels using a dry cloth to lightly wipe the surface. For ingrained dirt we
suggest a water dampened cloth is used to lightly wipe the surface, however,
please avoid the clear area of the window to avoid clouding.
2 At the beginning of each working shift, press the Test pushbutton and check
that all LED’s, LCD’s displays and audibles are functioning correctly
3 At regular intervals (established by operational experience) check the correct
operation of all alarm channels. These checks should be made by a qualified
technician / engineer and records kept of the test schedule
4 Include the LN1000 system in the inspection schedule for IS equipment
Recommended Spares
The LN1000 system is very reliable. If the annunciator is essential to the safe operation of
the plant it is recommended that a stock of the following spares is maintained:
1
LN1000-AC
Alarm
Card
1
LN1000-SC
Sequence
Card
1
MTL5021
IS
Isolator
1
Power Supply Unit
RT Series
