© National Instruments
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4-9
RMX Programmable Power Supplies User Manual
•
External monitoring of the output voltage (V MON)
—You can monitor the output
voltage of each unit from pin 25 of the J1 connector. To calculate the total output voltage,
add the monitor values of the master unit and the slave unit.
•
External monitoring of the output current (I MON)
—This can only be monitored from
pin 25 on the master unit's J1 connector.
•
Status Monitors
—You can monitor the status of the following items from the J2 connector
on the master unit and from the slave unit: constant-voltage mode (CV STATUS),
constant-current mode (CC STATUS), output on, POWER switch on, and alarms.
Remote Sensing
To perform remote sensing, connect the RMX programmable power supplies in series, and then
connect the sensing cables to them as shown in the following figure.
Caution
If the sensing cables are not connected properly, the load may be exposed
to excessive voltage, and the RMX programmable power supplies may be damaged.
When the load cables are distributed over longer distance, the phase shifting due to
wiring inductance and capacitance may go beyond the limit and result in oscillation.
To prevent such oscillation, connect an electrolytic capacitor with several hundreds
to several tens of thousands
μ
F across the load.
Use an electrolytic capacitor with a withstand voltage that is 120% or more of the
total of the rated output voltages of the RMX programmable power supplies that are
connected in series.
Figure 4-5.
Connecting the Sensing Cables During Series Operation
+
+
–
–
C
Connect an
electrolytic
capacitor across
the load as
necessary.
Load
+S
-S
+S
-S
Output terminal
Chassis terminal
Sensing terminal
Unit 1
Unit 2
Output terminal
Chassis terminal
Sensing terminal
