4.3 Power supply
4-10
1.0 2.0 3.0 4.0
10
20
30
40 m
0
20A
10A
30A
40A
4sq = 4.61 ohm/km
Voltage drop in cable
Cable length
5.0 6.0 7.0 8.0
2) AC power supply cable
The gauge of the AC cable is also determined by the carrying current and line length.
The tolerance of the AC/DC supply and battery charger is within ±10 % of their
nominal values. The cable loss must be limited to 3 to 5 % when the connection losses
and wiring losses in the unit are taken into account. The method of calculating the cable
loss is shown in the following. Refer to table 4.3.6.
* Voltage drop in cable (V): e = (K x I x r x L) / 1000
* Line length of cable (m): L = (1000 x 3) / (K x I x r)
where,
K = coefficient (single-phase/DC: two- and three-phase: √3)
I = current (A)
r = resistance (ohm/km)
L = cable length (m)
Specifications of supply units
• PR-850A: 30 A max. (INPUT AC100V / OUTPUT 60A)
• PR-300: 4.1 A max. (INPUT AC100V / OUTPUT 7.5A)
• BC-6158: 15 A max. (INPUT AC100V / OUTPUT 30A)
Table 4.3.6 10 sq cable
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