Checking the transducer lower and hoist functionality - Sonar room 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 in the sonar room.
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 [Bridge] are done on the bridge.
Note
In the event of problems or malfunctions:
1 Locate the Motor Protecting Switch (S301).
2 Set the switch to position OFF.
WARNING
High voltages are used. This equipment must be serviced only by qualified personnel familiar with high-voltage equipment and the potential hazards involved. Failure to observe this precaution could result in bodily injury.
Procedure
1 [Bridge] Make sure that you have sufficient water depth below the keel before you lower the transducer.
2 Locate the Motor Protecting Switch (S301). Set the switch to position ON.
3 Locate Hoist/Lower Switch (S302). Set the switch to position REMOTE.
4 [Bridge] Lower the transducer to its middle position.
When the transducer shaft stops, make sure this happens at the correct middle position.
5 [Bridge] Lower the transducer to its bottom position.
When the transducer shaft stops, verify that the correct bottom position has been reached.
6 [Bridge] Hoist the transducer to its middle position.
When the transducer shaft stops, make sure this happens at the correct middle position.
7 [Bridge] Hoist the transducer to its upper position.
When the transducer shaft stops, verify that the correct upper position has been reached.
8 [Bridge] Lower the transducer to its bottom position.
When the transducer shaft stops, verify that the correct bottom position has been reached.
9 [Bridge] Hoist the transducer to its upper position.
When the transducer shaft stops, verify that the correct upper position has been reached.
10 [Bridge] Notify the sonar room to do the next step.
11 Locate Hoist/Lower Switch (S302). Set the switch to position STOP.
12 [Bridge] Power down the CS90.
13 [Bridge] Notify the sonar room that the test is finished.
Result
Requirements Results
The lowering and hoisting functionality - as seen from the sonar room - is operational.  
The transducer is lowered and hoisted without complications or obstacles.  
Date and signature: