Checking the transducer lower and hoist functionality - Bridge steps
The hull unit provided with the CS90 is designed to lower the transducer down below the ship’s hull when the CS90 shall be used. This is a key functionality of the CS90. It is very important that the hoist/lower function is tested before the CS90 is put to operational use. In order to test the lower and hoist functionality of the hull unit, two tasks must be done simultaneously. These tasks are done on the bridge.
Prerequisites
The CS90 is installed as specified in this manual. The CS90 is turned on, and it is working normally. Neither tools nor instruments are required.
Context
Certain steps in the two procedures are location specific. The steps marked [Sonar room] are done in the sonar room.
Procedure
1 Make sure that you have sufficient water depth below the keel before you lower the transducer.
2 [Sonar room] Locate the Motor Protecting Switch (S301). Set the switch to position ON.
3 [Sonar room] Locate Hoist/Lower Switch (S302). Set the switch to position REMOTE.
4 Lower the transducer to its middle position.
a On the Operating Panel, press Middle.
Image
To indicate transducer movement, the Middle indicator lamp flashes, and an audible signal is sounded. When the middle position has been reached, the indicator lamp is lit, and the audible signal stops.
b [Sonar room] When the transducer shaft stops, make sure this happens at the correct middle position.
5 Lower the transducer to its bottom position.
a On the Operating Panel, press Down.
Image
To indicate transducer movement, the Down indicator lamp flashes, and an audible signal is sounded. When the bottom position has been reached, the indicator lamp is lit, and the audible signal stops.
b [Sonar room] When the transducer shaft stops, verify that the correct bottom position has been reached.
6 Hoist the transducer to its middle position.
a On the Operating Panel, press Middle.
b [Sonar room] When the transducer shaft stops, make sure this happens at the correct middle position.
7 Hoist the transducer to its upper position.
a On the Operating Panel, press Up.
Image
To indicate transducer movement, the Up indicator lamp flashes, and an audible signal is sounded. When the upper position has been reached, the indicator lamp is lit, and the audible signal stops.
b [Sonar room] When the transducer shaft stops, verify that the correct upper position has been reached.
8 Lower the transducer to its bottom position.
a On the Operating Panel, press Down.
b [Sonar room] When the transducer shaft stops, verify that the correct bottom position has been reached.
9 Hoist the transducer to its upper position.
a On the Operating Panel, press Up.
b [Sonar room] When the transducer shaft stops, verify that the correct upper position has been reached.
10 Notify the sonar room to do the next step.
11 [Sonar room] Locate Hoist/Lower Switch (S302). Set the switch to position STOP.
12 Power down the CS90.
If the transducer is lowered when you turn off the CS90, it is automatically retracted to its upper position. The Transceiver Unit is turned off. The CS90 program closes down.
13 Notify the sonar room that the test is finished.
Result
Requirements Results
The lowering and hoisting functionality - as seen from the bridge - is operational.  
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