© National Instruments | 4-11
RMX Programmable Power Supplies User Manual
Complete the following steps to connect the load.
1. Turn off all the RMX programmable power supplies that you want to connect in series.
2. Remove the OUTPUT terminal covers.
3. Use load cables to connect unit 1 and unit 2 to the load or relay terminal block.
Use load cables that have sufficient current capacity. Wire the load cables so that they are
as short as possible. If the voltage drop in the load cable is large, the difference in electric
potential between power supply units and the load effect become large.
4. Connect the cables to the output terminals of unit 1 and unit 2.
5. Connect the output terminal (positive or negative) of unit 1 or unit 2 to the chassis terminal.
6. Attach the OUTPUT terminal cover.
Settings (Series Operation)
Setting the Voltage and Current
Set the voltage and current on each unit. The voltage that is output is the total of the voltages of
the two units. Set the current to the same value on the two units.
Setting the Overvoltage Protection (OVP) and Overcurrent
Protection (OCP)
In series operation, you have to set the overvoltage protection (OVP) and overcurrent protection
(OCP) on both units. Specify the same values on the two units.
Starting (Series Operation)
Turning the Power On and Off
Turn the POWER switch on unit 1 and unit 2 on or off.
Caution After you turn the POWER switch off, wait at least 10 seconds after the
fan stops before you turn the POWER switch back on. Repeatedly turning the
POWER switch on and off at short intervals can cause damage to the inrush current
limiter. In turn, this will shorten the service life of the POWER switch, internal input
fuse, and other components.
Turning the Output On and Off
Press OUTPUT on unit 1 and unit 2 to turn the output on or off.
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