Series Connection For Positive And Negative Output Voltage - Delta D750 User Manual

User Manual
D750
DC Power Supply
2. Using the SO function and PS_OK signal: The Shut-Off and PS_OK circuits are
referenced to the common, IF_COM (J1-2, 3). The IF_COM terminals of different units
can be connected to obtain a single control circuit for the power supplies connected in
series.
3. Programming by external resistor: Programming by external resistor is possible. Refer
to section 4.1.5 for details.
4. Programming via the Serial Communication port (RS232/RS485): The power supplies
connected in series can be chained using the Remote-In and Remote-Out connectors.
Refer to sec. 4.2 for details.

3.4.1.2 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 incase 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.3-7 for his 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 Sense potential. Therefore, the circuits used to
control each series connected unit must be separated and floated from each other.
2. Using the SO function and PS_OK signal : The Shut-Off and PS_OK circuits are
referenced to the 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.
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+LS +S
POWER
SUPPLY
-LS -S
+LS +S
POWER
SUPPLY
-LS -S
Fig.3-7: Series connection for positive/negative output voltages
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(*)
-
+
COM
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+
(*) (*) Diodes are user supplied
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