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Service Manual
Third edition, June 1997
3.19 Level Unit – Relays
In the status box in this window the status of the relays in the
Power Block of the Level Unit are shown. These will show
the same status as the Sysfail and Power fail in the LCI status
window described in chapter 3.15. The External pressure
alarm relay will be activated when the this alarm is active.
See chapter 3.11 for more information.
Note: The Sysfail and Power fail relays are normally on. This
means that when the system is working, the relays are activated
and consequently off. During a black out, for example, these relays
go on.
In the TankRadar systems that have a Work Station, the
relays in the I/O Box are used instead of the ones in the
Level Unit. See also chapter 5.11 and 4.1.4.
In the database box it is possible to manually set the two
auxiliary relays in the Power Block. Enter a “1” and hit the
Save-button to activate the relay.
If the relays in the Level Unit are used for System Failure,
Power Failure and Extreme Pressure Alarm indication, these
warnings can be reset by hitting the buttons at the bottom of
the window. Use the Abort-button if there would be any
problem when hitting the Reset-buttons.
Note: It is only the relays that are reset, the alarms may still be
active. This is useful for example when you need to quiet a siren
that is connected to one of the relays.