381295/B
111
4
Specify the sound speed.
5
Select
OK
to save the selected settings and close the dialog box.
Related topics
Defining settings related to user preferences and individual customizing, page 102
Setting up the alarm limits for system protection
Safe operation of the SN90 is made possible using multiple sensors that monitor the
operation and the performance. Whenever a suspicious event takes place, a relevant
message, warning or alarm is provided. Selected alarm limits may be adjusted to fit
your operational requirements.
Procedure
1
Open the
Setup
menu.
2
On the
Setup
menu, select
Installation
.
Observe that the
Installation
dialog box
opens. This dialog box contains a number of
pages selected from the menu on the left side.
3
On the left side of the
Installation
dialog box, select
System Protection
to open the
page.
4
Define the relevant parameters.
•
Tx Inhibit Hull Unit Position
: With the transducer fully retracted, no transmissions
("pings") take place. When you lower the transducer into the water, you can
specify a vertical position for when the transmissions start. When the transducer
is retracted, transmissions will stop when the transducer reaches the same
position.
•
Tx Inhibit Power
: The high voltage supplied to the transceiver boards is
monitored. If this voltage differs from the defined tolerances, an alarm message
will be initiated. You are not permitted to change the limit values.
•
Tx Inhibit Firmware
: The firmware on the transceiver boards is checked to verify
compatibility with the SN90 operational software. The alarm is provided to
make sure that the functionality offered by the SN90 can be supported by the
transceiver boards. A mismatch will trigger a "firmware not accepted" alarm.
•
Tx Inhibit Operation Mode
: This feature activates the system protection to make
sure that the SN90 does not transmit ("ping") when you have chosen
Replay
or
Inactive
mode.
•
Vessel Speed
: When the transducer is fully lowered, the speed of the vessel must
not exceed the maximum speed permitted by the hull unit. This maximum speed
depends on the size of the transducer, the mechanical construction of the hull
unit, and how far down the transducer has been lowered. The
System Protection
page allows you to define an "Upper Warning Limit" that initiates the alarm.
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