Setting up the alarm limits for system protection
Safe operation of the SU90 system 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.
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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: If the transducer is activated when out of the water it may be damaged beyond repair. 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. You are not permitted to change the alarm limits. If this voltage differs from the defined tolerances, alarm message AKH11 will be initiated: Transmission is inhibited due to a high voltage in the power supply.
•  Tx Inhibit Firmware: The firmware on the transceiver boards is checked to verify compatibility with the operating software. The alarm is provided to make sure that the functionality offered by the SU90 system 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 SU90 system 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 for the hull unit. This maximum speed depends on the physical 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 a limit that triggers an alarm if the maximum speed is exceeded.
5 At the bottom of the page, select Apply to save your settings.
6 Continue your work in the Installation dialog box, or select OK to close it.