TDK Lambda | Z+High Voltage User Manual

5.4.2 Series Connection for Positive and Negative Output Voltage In thismode, two units are configured as positive and negative output. Set the current limit of each power supply to themaximum 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.

+S

+LS

+ -

POWER SUPPLY

(*)

-LS

-S

+

COM. LOAD

-

+S

+LS

+

POWER SUPPLY

(*)

(*) Diodes are user supplied.

-

-S

-LS

Fig.5-3: Series connection for positive/negative output voltages

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 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 is possible. Refer to section 6.5 for details. 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.

Using the SO function and PS_OK signal :

Programming by external resistor :

Programming via the Serial Communication port (RS232/RS485, USB):

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