Connecting the 3-phase AC power to the Motor Control Unit
The electric hoisting motor on the hull unit requires 3-phase AC power for operation. The AC power is connected to terminal block E301 inside the Motor Control Unit.
Prerequisites
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•  The SU90 system is turned off.
•  The circuit breaker for the 3-phase AC power is disengaged.
•  All cable connections are made.
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.
•  Multimeter
Context
Terminal block E301 is located at the bottom of the Motor Control Unit. The three AC mains power cables, as well as ground, are connected from the ship’s circuit breakers to E301.
WARNING
High voltages are used. This equipment must be serviced only 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 the Motor Protecting Switch (S301). Set the switch to position OFF.
2 Locate the Hoist/Lower Switch (S302). Check that the switch is in position STOP.
3 Make sure that each cable is installed as specified in the Cable layout and interconnections chapter.
4 To apply power, close the circuit breaker for the 3-phase AC voltage.
5 Measure the 3-phase AC mains voltage on terminal block E301.
6 Adjust the release current on the Motor Protecting Switch (S301) according to the 3-phase voltage in use.
•  230 VAC10 A (Maximum)
•  380/440 VAC6.5 A
Result
Test requirements Results
The 3-phase AC power cable has been correctly connected to terminal block E301.
The applied voltage is measured.
The release current is adjusted.
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