63
83532002 Rev C
6.1.2. Series Connection for Positive and Negative Output Voltage
In this mode, two units are configured as a 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.6-3 for this operating mode.
Remote programming in series operation for positive and negative Output
voltage
1. Programming by external voltage: The Analog programming circuits of this power supply are
referenced to the negative local sense (-LS) potential. Therefore
the circuits used to control series connected unit must be
separated and floated from each other.
2. Using the SO function and PS_OK: The Shut-Off and PS_OK circuits are referenced to the isolated
interface common, IF_COM (J1-2,-3). The IF_COM terminals of
the units can be connected to obtain a single control circuit for
the power supplies connected in series. See Section 6.2.1 for
details.
3. Programming by external resistor: Programming by external resistor is possible.
Refer to Section 7.5 for details.
4. Programming via the Serial
Communication port (RS232/RS-
485):
The communication port is referenced to the isolated interface
common, IF_COM (J1-2,-3), which is isolated from the power
supply output potential. Therefore, power supplies connected in
series can be daisy-chained using the Remote-In and Remote-
Out connectors. Refer to Chapter 8 for details.
Fig.5-3: Series connection for positive/negative output voltages
+S
+
-
-S-LS
+LS
POWER
SUPPLY
+S
+
+
-
-
-S
-LS
+LS
POWER
SUPPLY
(*) Diodes are user supplied.
Fig 6-3: Series connection for positive/negative output voltages
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