Power cable selection
5-2
Chapter 5: Connecting power
98-136280-B
5.2
Power cable selection
5.2.1
Source impedance
The maximum length of the power cable depends on the type of cable used and the
source impedance of the DC power installation in the ship.
The maximum allowed source impedance depends on the usage of the power range of
the terminal DC input (Start up voltage: 22 VDC guaranteed, operating range: 20 —
32 VDC; 23 A - 14 A).
Select a power outlet from the DC system and measure the source impedance of the
ship installation as described in the next section.
For further recommendations on power cable selection, see
5.2.2
Measuring the ship source impedance
Select a power outlet from the ship 24 VDC system and measure the source impedance
of the ship installation as described below.
1. Measure the voltage without load (R.var disconnected).
2. Set the current to e.g. 1 A by adjusting R.var.
3. Measure the corresponding voltage change.
Example:
1 A and 50 mV. Source impedance: 50 mV/1 Amp = 50 mOhm.
Note
If the total impedance is higher than the limits stated in
section 5.2.3, the terminal may become unstable and start
to on/off oscillate.
The total impedance is made up of the source impedance of
the ship power supply plus the impedance of connected
cables including connectors and joints where cables are
extended.
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