Vetus-Maxwell RC12-HD, Manual

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2.5 POWER CONECTIONS TO DC MOTOR
See Table 2.1 to select the appropriate cable size for power supply. The recommendation assumes
that the cable insulation has a minimum temperature rating of 90°C and sizes allow for a maximum
10% voltage drop over the total length.
Cable lengths given are from the battery terminal to the terminal on the motor, via the solenoid box,
and then back to the battery.
Where a portion of cable runs through the engine room, a size increase should be made as indicated.
After connecting the cables, spray all terminals with anti-
corrosive waterproof coating, “CRC 3013
Soft Seal” or equivalent.
24v Systems
Total Cable Length from battery to winch then
back to battery
Wire Size
Engine Room Wire
Size Correction*
mm² AWG mm² AWG
Up to 25m (82
’)
From 25m-35m (82
’-114’)
From 35m-45m (114
’-148’)
25
35
50 4
2
1 35
35
-
2
2
-
Table 2.1
Recommended wire sizes
Motor
When tightening the cables to the motor, ensure the lower nut (A) is secure against turning when tightening
the upper nut (B). This will prevent damage occurring within the motor
2.6 SELECTION OF MOTOR STARTER
Several AC motor starter options for windlasses are available, each with characteristic current
demands and start load limitations. Maxwell recommends that selection of the best motor start system
be entrusted to experienced persons familiar with anchoring procedures and the vessels generating
capacity.
"Direct On Line" starter is the simplest way of starting an AC motor and it will allow the windlass to
start under full rated load. However, this method requires relatively high momentary starting current,
which the generators may have adverse effect to the rest of the electrical system on board. See
specifications for current values at 400V in Section 1.3 and make sure to recalculate it for the voltage
used on board. Start current may be limited to about half the above amount by using a "Star-Delta"
starter. However, start torque is thereby limited to loads of about 25-30% of the windlass rated
capacity.