Chapter 7 Tutorial
Connecting the Load
141
7
Connecting the Load
Output Isolation
The output of the power supply is isolated from chassis ground. Any output terminal
may be grounded, or an external voltage source may be connected between any
terminal output and ground. However, output terminals must be kept within ±60 Vdc
when metal shorting bars without insulation are used to connect the (+) output to the
(+) sense and the (-) output and the (-) sense terminals or ±240 Vdc of ground when
metal shorting bars without insulation are either replaced with insulated conductors
or they are removed from the terminals so there is no operator access to the output
conductors without insulation. A chassis ground terminal is provided on the front
panel for convenience.
Multiple Loads
When connecting multiple loads to the power supply, each load should be connected
to the output terminals using separate connecting wires. This minimizes mutual
coupling effects between loads and takes full advantage of the low output impedance
of the power supply. Each pair of wires should be as short as possible and twisted or
shielded to reduce lead inductance and noise pick-up. If a shield is used, connect one
end to the power supply ground terminal and leave the other end disconnected.
If cabling considerations require the use of distribution terminals that are located
remotely from the power supply, connect output terminals to the distribution terminals
by a pair of twisted or shielded wires. Connect each load to the distribution terminals
separately.
Table 7-1 Wire Rating
Warning To satisfy safety requirements, load wires must be heavy enough not to overheat while
carrying the short-circuit output current of the power supply.
AWG 10 12 14 16 18 20 22 24 26 28
Suggested
maximum
Current(amps)*
40 25 20 13 10 7 5 3.5 2.5 1.7
mΩ/ft 1.00 1.59 2.53 4.02 6.39 10.2 16.1 25.7 40.8 64.9
mΩ/m 3.3 5.2 8.3 13.2 21.0 33.5 52.8 84.3 133.9 212.9
*Single conductor in free air at 30 °C with insulation
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