Simrad SC90, Installation Manual

Page: 295 / 544

419050/B
293
Checking the operation of the Hoisting and Lowering
contactors
The
Hoisting Contactor
(K301) and the
Lowering Contactor
(K302) are located on the
upper DIN rail in the Motor Control Unit. Each contactor operates on +24 VDC supplied
by the internal power supply. When activated,
Hoisting Contactor
(K301) starts the
motor in order to retract the transducer. The
Lowering Contactor
(K302) starts the motor
to lower the transducer.
Prerequisites
Before you can do this task, the
following prerequisites must be met:
• The SC90 is turned off.
• The circuit breaker for the 3-phase
AC power is closed. AC power
is connected.
• The transducer is in its upper
position with the
Upper Limit
Switch
(S304) activated.
You must be equipped with a
standard set of tools. This tool set
must comprise the normal tools for
electronic and electromechanical
tasks. This includes different
screwdriver types, pliers, spanners,
a cable stripper, a soldering iron
etc. Each tool must be provided in
various sizes. We recommend that
all tools are demagnetized to protect
your equipment.
Context
The following conditions must be set to activate
Hoisting Contactor
(K301):
• The
Hoist/Lower Switch
(S302) must be set to HOIST or REMOTE .
• The
Lowering Contactor
(K302) must be deactivated.
• The
Upper Limit Switch
(S304) must be deactivated with the transducer in lower
position or on its way up.
• The
Hand Crank Switch
(S203) must be closed with the hand crank in its storage
position.
The following conditions must be set to activate
Lowering Contactor
(K302):
• The
Hoist/Lower Switch
(S302) must be set to LOWER or REMOTE .
• The
Hoisting Contactor
(K301) must be deactivated.
Setting to work