Emergency Lowering And Hoisting Using The Two Contactors - Simrad SN90 Operator's Manual

Simrad SN90 Operator Manual

Emergency lowering and hoisting using the two contactors

In case of emergency it is possible to bypass the control logic in the Motor Control Unit.
You can control the hoisting motor directly using the two designated contactors.
Prerequisites
You need a suitable screwdriver
or a large coin to open the
Motor Control Unit cabinet.
You also need a small
screwdriver. 3-phase voltage
for the hoisting motor is
available.
Context
The two contactors are
identified as K301 and K302.
The
Hoisting Contactor
and the
Lowering Contactor
(K302) are located on the upper
DIN rail in the Motor Control
Unit.
• : When activated,
Left side
the
Hoisting Contactor
(K301) starts the motor in
order to hoist the transducer.
• : The
Right side Lowering
(K302) starts the motor to lower the transducer.
Contactor
WARNING
This operation overrides the upper and lower limit switches. The contactors must
be released before the transducer reaches upper or lower position. Failure to do
so may result in serious mechanical damage to the hull unit.
Procedure
1 Make sure that you have sufficient water depth below the keel before you lower
the transducer.
If your vessel is in dry dock, make sure that you have sufficient height between
the hull and the dry dock floor. The space under the hull must be free from tools,
scaffolding, personnel and other obstacles.
130
(K301)
381295/B