Kongsberg Simrad SN90 Reference Manual page 600

Simrad SN90 Reference Manual
is retracted, transmissions will stop when the transducer reaches the same
position.
This functionality is only available if a hull unit has been activated in the
user interface.
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:
inhibited due to a high voltage in the power supply.
Tx Inhibit Operation Mode
This feature activates the system protection to make sure that the SN90
system does not transmit ("ping") when you have chosen Replay or Inactive
mode.
Hull Unit
The SN92H Hull Unit is designed to lower the transducer 1.2 meters below the
ship's hull. Maximum vessel speed with the transducer fully lowered is 18 knots.
You must specify a maximum speed for the vessel. This speed can match the hull
unit specification, or you can choose a lower speed for increased safety.
Note
We strongly recommend that you do not specify a higher speed than the hull unit is
designed for.
If the speed limit is exceeded a message is issued by the SN90 system.
The SN90 system can be provided with one of the following hull units:
Hull Unit
SN92H
SN92HPX
SN93H
SN93HPX
SN92HPX, SN93HPX: Two trawl hydrophones are added for use with a catch monitoring
system. Both hydrophones point aft.
598
Lowering depth (m) Transducer cables
(m)
1.2 13
1.2 13
1.6 13
1.6 13
Transmission is
Maximum speed
(knots)
16
14
14
12
381294/E