User manual

LABKON Series
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52 GMC-I Messtechnik GmbH
5.6 Connecting the Load
5.7 Output Isolation
The output of the power supply is isolated from earth ground and the power supply can be connected to the ground with the
earth ground terminal when needed. Any output terminal can be grounded, and an external voltage source may be
connected between any terminal output and ground. However, output terminals must be kept within ±240 V DC of ground. An
earth ground terminal is provided on the front panel for convenience.
5.8 Multiple Loads
When connecting multiple loads to the power supply, each load should be connected to the output terminals with 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. And for safety consideration, connecting lead with a large diameter is preferred to avoid
overheat in heavy current condition. 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 binding terminals
separately.
To satisfy safety requirements, load wires must be heavy enough to avoid overheat while carrying the high
output current of the power supply.
Remote Voltage Sensing
Figure B shows the wiring for remote sensing. The connections illustrated in Figure B can be switched to remote sense
connections. As the remote sense leads connected to S+ and S- do not carry load current, you can use smaller gauge wire
for the sense leads.
If the sense terminals (S+ and S-) are left open as shown in Figure A, the voltage at the output terminals
will increase approximately by 1 to 3% over the programmed value. And the feedback voltage will not
indicate this increase.
The dashed lines in Figure B illustrate remote sense connections. In this case, the remote sense terminals of the power
module are connected to the load rather than the output terminals. This allows the power module to automatically
compensate for the voltage drop in the load leads as well as to accurately read back the voltage at the load.