Hoisting And Lowering From The Sonar Room - Simrad SX90 - REFERENCE MANUAL REV D Reference Manual

On-board maintenance
Figure 45 Location of S301, F301 and +24 Vdc power supply
Motor Protecting Switch S301
To prevent the hoist/lower motor from overload, the 3-phase
voltage for the motor is fused with the current adjustable motor
protecting switch . This switch is located inside the Motor
S301
Control Unit. It will automatically be switched off during
hoisting and lowering in the event of:
• the vessel's speed is too high
• the transducer shaft has been bent
• the lubrication reservoir on the Hull Unit is empty
In such case, a failure warning will be presented on the sonar
display. After the cause of the failure has been fixed, the
protecting switch is reset by pressing the operating handle
upwards to position . For service purposes, this operating
ON
handle can be pressed downwards to position to prevent
OFF
unexpected operation while servicing the Hull Unit.
Fuse F301
The Motor Control Unit contains an internal +24 Vdc power
supply for the control electronic. This power supply is powered
from two phases of the 3-phase voltage, and is fused with
F301
which is a 500 mA Slow Blow type. The fuse is located on the
right-hand side on the 3-phase terminal .
E301

Hoisting and lowering from the sonar room

In case of failure in the normal hoist/lower operation controlled
from the Operating Panel, or for maintenance purposes, the
transducer may be hoisted and lowered from the sonar room.
Three different procedures may be used.
199
307670/D