© National Instruments | 1-11
RMX Programmable Power Supplies User Manual
Protecting Against Noise
When connecting wires that have the same heat resistance, separating the wires as much as
possible to increase heat radiation enables a greater amount of current to flow. However, wiring
the + (positive) and - (negative) output wires of the load cable side by side or bundling them
together will minimize unwanted noise on the output. The currents shown in Table 1-1 are
allowable currents that have been reduced in consideration of the potential bundling of load
cables. Use these values as a guideline when connecting load cables.
Cabling Considerations When Using Remote Sensing
As you increase the current setpoint or increase the resistance of your load cabling, the voltage
drop between the RMX power supply and your load will increase. This results in the voltage at
your load being smaller than the programmed voltage setpoint. Refer to Appendix A,
Specifications, to see the maximum voltage drop each RMX power supply's remote sense
terminals can compensate for. If the voltage drop exceeds this level, use shorter load cables or
cables with a greater cross-sectional area.
8 mm
2
8 (8.37mm
2
) 61 A 30 A
14 mm
2
6 (13.3 mm
2
) 88 A 50 A
22 mm
2
4 (21.15 mm
2
) 115 A 80 A
30 mm
2
2 (33.62 mm
2
) 139 A —
38 mm
2
1 (42.41 mm
2
) 162 A 100 A
50 mm
2
1/0 (53.49 mm
2
) 190 A —
60 mm
2
2/0 (67.43 mm
2
) 217 A —
80 mm
2
3/0 (85.01 mm
2
) 257 A 200 A
100 mm
2
4/0 (107.2 mm
2
) 298 A —
125 mm
2
— 344 A —
150 mm
2
— 395 A 300 A
200 mm
2
— 469 A —
Table 1-1. Current Capacity of Heat-resistant Vinyl Wires (Continued)
Nominal
Cross-sectional
Area
AWG (Reference
Cross-sectional
Area)
Allowable
Current
(Ta = 30 °C)
Recommended
Current
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