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NATIONAL
INSTRUMENTS
5.4.3 Remote Programming in Series Operation
Programming by external voltage: The analog programming circuits of this power supply are referenced
to the negative Sense potential. Therefore, the circuits used to control
each series connected unit must be separated and floated from each
other. Refer to section 6.4
Using the SO function and PS_OK signal : The Shut Off and PS_OK circuits are referenced to the isolated interface
common, IFC_COM (J3-7). The IFC_COM terminals of the units can be
connected to obtain a single control circuit for the power supplies
connected in series.
Programming by external resistor : Programming by external resistor is possible. Refer to section 6.5 for
details.
Programming via the Serial Communication
port (RS232/RS485, USB): The Communication port is referenced to the IFC_COM which is
isolated from the power supply output potential. Therefore power
supplies connected in series can be chained using the Remote-In and
Remote-Out connectors. Refer to Chapter 7 for details.
5.4.2 Series Connection for Positive and Negative Output Voltage
In this mode, two units are configured as positive and negative output. Set the current limit of each
power supply to the maximum that the load can handle without damage. It is recommended that
diodes be connected in parallel with each unit output to prevent reverse voltage during start-up
or in case one of the units shuts down. Each diode should be rated to at least the power supply
rated output voltage and output current. Refer to Fig.5-3 for this operating mode.
Fig.5-3: Series connection for positive/negative output voltages
+S
+
-
-S -LS
+LS
+S
+
+
-
-
-S -LS
+LS
(*)
(*)
POWER
SUPPLY
POWER
SUPPLY
COM.
LOAD
(*) Diodes are user supplied.