Installation manual

Simrad SD570 / Base version

851--160117 / B

2.2 Adjusting the middle position switch

Normally, when the transducer is selected to middle position on

the Sonar Control Unit, only onehalf of the transducerface should

be outside the sonar trunk (see figure 5). The middle position

switch, which is a magnetic switch, must then be adjusted

according to the trunk length:

j With the Hull Unit fully hoisted to upper position,

measure the distance x between the bottom of the

transducerandthetrunkend.Seethelowerpartoffigure

X = mm

If it is impossible to measure the distance x, it can be calculated by

using the total trunk height C from page 12 in section “Installation

procedures” .

Total trunk height C = mm

-- Distance flange/transducer bottom = 760 mm

= Distance X mm

j Use the hoisting/lowering switch in the motor control

unit to position the transducer in the calculated correct

position x + 240 mm (see figure 5).

j Loosen the bracket for the middle position switch and

aligntheswitchrelativetothemagnetasshownonfigure

5. If needed, spare cable is coiled up behind the bracket.

j Fasten the bracket and check that the distance between

the magnet and the switch is approximately 5--8 mm.

j Check the passing of the middle position switch by using

the hoisting/lowering switch.

j Usethehoisting/loweringswitchtohoisttheHullUnitto

its upper position.

j Release the motor overload switch S301 by pressing the

red button marked ”0”. This to prevent unwanted

lowering of the transducer.