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Service Manual
Third edition, June 1997
5.3 Restarting the Level Unit
1. Check with officer in charge that it is OK to restart the
system. A restart means there may be no information
for a few minutes.
2. Open the front door of the Level Unit.
3. Switch the power off by setting the power switch on the
Power Block to position 0.
4. Wait until the red LED on the Calculation Unit’s power
supply goes off.
5. Set the power switch to position 1 and the system will
start up again.
5.4 Description of the Calculation Unit
The Calculation Unit at the top part of the Level Unit has the
following components,
• one or two LCS
• one or two LCM
• one LCI
• one Backup Display with keyboard
• power supply for the Calculation Unit.
These components are mounted in a board cage. Each one is
easy to remove for replacement.
Two sets of LCS and LCM can be used for one of two pur-
poses:
• for redundancy. One of the boards is active, and the
other board is standby to start measuring if the first
board becomes faulty.
• for increased performance of the system. It is possible
to have quicker updates with two sets of the LCM and
LCS serving about half of the transmitters each, distrib-
uted on two or more LIs.
7890
456
123
ALARM SYSTEM
MENU SERV
ENTER CLEAR
LCP LCM LCS LCM LCS LCI
OK i
1 2 3
Backup Display
Interface Board
Signal Board
Processor Memory Board
Calculation Unit Power Supply
Figure 5-3.
The Calculation Unit.