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86
Service Manual
Third edition, June 1997
8 Tank Display Unit (Option)
100
%
80
60
40
20
0
R
COMMON
ALARM
M
Ft
Bargraph indicates percentage of full tank
Press to display tank level with one LED
point on the bargraph. Press again to
change back to bargraph mode.
Hi.Hi alarm indication
Hi alarm indication
Press to display Hi alarm limit on the numeric
LED display. If the Hi alarm is blocked, the
display shows "99.99".
Press to display Lo alarm limit on the
numeric LED display. If the Lo alarm is
blocked, the display shows "99.99".
Lo alarm indication
Lo.Lo alarm indication
Press to accept Hi.Hi, Hi, Lo or Lo.Lo alarms.
COMMON ALARM indication of alarm on
any parameter in this tank. Accept from Work
Station.
LED display for ullage/innage or alarm levels
8.1 Replacing a Tank Display Unit
1. Begin by loosening the four panel screws and pull the
TDU out of its console.
2. Disconnect the wires to the terminal block on the back
of the TDU board.
3. Before you install the new TDU you must address the
TDU with its unique number. Set the address switch to
the same positions as on the TDU you are replacing.
The address switches are located in the middle of the
TDU board, and accessed through an opening in the
black cover plate. The positions of the switches repre-
sent a binary ”1” or ”0”.
Note: Use a slightly blunt object to set the DIL switch. Do not use
a lead pencil as some of the lead might come off and damage the
switch.
Figure 8-1. Tank Display Unit for ullage indication.
1 2 3 4 5 6 7 8
OPEN
Binary
Code
1248163264128
Example:
Tank 10
Figure 8-2. In the exam-
ple the switches have been
set to address Transmitter
in tank number 10.