Motor Protecting Switch (S301); Docking The Vessel - Simrad SH90 - REFERENCE MANUAL REV A Reference Manual

On-board maintenance

Motor protecting switch (S301)

To prevent the hoisting 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.
The motor protecting switch will automatically disable hoisting
and lowering, if:
• the vessel's speed is too high
• the transducer shaft has been bent
• the lubrication reservoir on the Hull Unit is empty
Figure 55 Location of S301 in the Motor Control Unit
To reset motor protecting switch , open the Motor Control
S301
Unit, locate and move the handle up to ON.
S301

Docking the vessel

When docking the vessel, great care must be taken not to damage
the sonar trunk and protecting blister.
WARNING
The sonar must never be powered up when the
ship is in dry dock. The transducer will be damaged
if it transmits in open air. To prevent inadvertent
use of the sonar, set the main on/off switch on
the Processor Unit to Off, or disconnect the mains
power, whenever the vessel is in dry dock.
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