14
Maximum length in meters to limit
Voltage drop to 1V or less
Cross sect.
Area
(mm
2
)
Resistivity
Ω/km
5A
10A
20A
50A
150A
2.5
8.21
24.0
12.0
6.0
2.4
0.8
4
5.09
39.2
18.6
9.8
4.0
1.4
6
3.39
59.0
29.4
14.8
5.8
2.0
10
1.95
102.6
51.2
25.6
10.2
3.4
16
1.24
160.0
80.0
40.0
16.0
5.4
25
0.795
250.0
125.0
62.0
25.2
8.4
35
0.565
354.0
177.0
88.0
35.4
11.8
For currents not shown in Table 3-2 and 3-3, use the formula:
Maximum length=1000/(current x resistivity)
where current is expressed in Amperes and resistivity in ohms/km or ohms/1000ft.
3.9.3 Wire termination
The wires should be properly terminated with terminals securely attached. DO NOT use
unterminated wires for load connection at the power supply.
CAUTION
When local sensing, a short from +LS or +S to -V or -S or -LS, will
cause damage to the power supply. Reversing the sense wires might
cause damage to the power supply in local and remote sensing. (Do
not connect -S to +V or +S to -V).
3.9.4 Noise and Impedance Effects
To minimize the noise pickup or radiation, the load wires and remote sense wires should be twisted
pairs to the shortest possible length. Shielding of sense leads may be necessary in high noise
environments. Where shielding is used, connect the shield to the chassis via a rear panel Ground
screw. Even if noise is not a concern, the load and remote sense wires should be twisted-pairs to
reduce coupling, which might impact the stability of power supply. The sense leads should be
separated from the power leads. Twisting the load wires reduces the parasitic inductance of the
cable which could produce high frequency voltage spikes at the load and the output of power supply,
because of current variation in the load itself. The impedance introduced between the power supply
output and the load could make the ripple and noise at the load worse than the noise at the power
supply rear panel output. Additional filtering with bypass capacitors at the load terminals may be
required to bypass the high frequency load current.
Summary of Contents for PU100-7.5
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