Simrad SC90, Installation Manual

Page: 293 / 544

419050/B
291
Checking the 3-phase connection for correct rotation
The electric hoisting motor on the hull unit requires 3-phase AC power for operation.
The Motor Control Unit is equipped with a Phase Watch Relay
(K303)
. This relay
prevents operation of the hoisting motor if the 3-phase AC power connections are wrong
with respect to the motor's rotational direction.
Prerequisites
• The SC90 is turned off.
• The circuit breaker for the 3-phase
AC power is closed. AC power
is connected.
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 Phase Watch Relay
K303
is
located at the right side of the Motor
Control Unit. LED
L1
indicates that the Phase Watch Relay
K303
is activated. This mean
that the 3-phase voltage is applied, and that the three phases are correctly connected with
regard to the rotation direction of the hoisting motor.
WARNING
High voltages are used. This equipment must only be serviced by qualified
personnel familiar with high-voltage equipment and the potential hazards
involved. Failure to observe this precaution could result in bodily injury.
Procedure
1 Locate
Hoist/Lower Switch
(S302). Set the switch to position
STOP
.
2 Locate the
Motor Protecting Switch
(S301). Press the operating handle upwards to
position ON .
3 Verify that LED
L1
on the front of the
Phase Watch Relay
(K303) is lit.
4 If the LED is not lit:
a To disconnect power, disengage the circuit breaker for the 3-phase AC voltage.
Setting to work