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Service Manual
Third edition, June 1997
5.10.10 Replacing a Transmitter Interface (LI)
1. If it is a completely new LI, set address switch on the
new LI to same positions as on the replaced LI. See also
chapter 5.10.5. Mark up the connectors on the new LI in
the same way as the replaced LI.
2. Mount the new LI and tighten the four nuts.
3. Fit connectors for Transmitters, power and flat cable.
5.11 Power Block
The Power Block powers the Level Unit and the intrinsically
safe equipment on deck.
The Power Block contains filters for the supply voltage, to
ensure that the strictest EMC requirements are met.
The Power Block can be set for supply voltages of either 115
or 230 VAC. The switch is located inside the Transmitter
Interface. The setting of the switch is marked on the outside
of the Power Block.
There are five relays in the Power Block. Three of these relays
are used for cargo tank IG extreme pressure alarm, power
loss and System Failure. Two relays can be controlled from
the Work Station. If a Work Station is included in the system,
there is also an I/O Box with a similar set of relays. These
relays will then be used instead of the ones in the Level
Unit’s Power Block. Only the relay for the IG extreme pres-
sure alarm is unique for the Level Unit.
There is an RS-232 connector and a power outlet located in
the Power Block for connecting a service PC to the Level
Unit.
5.11.1 Fuses in the Power Block
There are six fuses that protect the two intrinsically safe
transformers. To maintain the intrinsic safety, it is very im-
portant to use correct fuses when replacing them. See the
Spare Parts List at in chapter 10 of this manual.
5.11.2 Replacing the Power Block
If the Power Block is faulty, replace it as a whole unit.
1. Remove the cover plate below the Power Block.
2. Remove the connectors.
3. Remove the four nuts holding the Power Block.
4. Check that setting of the power supply is correct on
new Power Block. The setting of the switch is marked
1
0
RS 232
connection for
Service PC
F1 F2 F3 F4 F5 F6
Power
outlet
COMBITECH GROUP
Saab Marine Electronics
Saab TankRadar
LP Power block
9150 064-641
F1
2A
F2
1A
F3
2A
F4
2A
F5
1A
F6
2A
NEMKO Nr Ex
Serial No.
(EEx ia)IIC
SERVICE PC
CONNECTOR
F8-8A
F7-2A
(SERVICE POWER)
SERVICE POWER
S1
Figure 5-12 shows the
Power Block.