TDK 750W, 1500W technical manual Series Operation, Series connection for increased output voltage

5.14 SERIES OPERATION

Power supplies of the SAME MODEL can be connected in series to obtain increased output voltage. Split connection of the power supplies gives positive and negative output voltage.

CAUTION

Do not connected power supplies from different manufacturers in series or in parallel.

5.14.1 Series connection for increased output voltage

In this mode, two units are connected so that their outputs are summed. Set the Current of each power supply to the maximum that the load can handle without damage. It is recommended that di- odes be connected in parallel with each unit output to prevent reverse voltage during start up se- quence or in case one unit shuts down. Each diode should be rated to at least the power supply rated Output Voltage and Output Current. Refer to Fig.5-1 and 5-2 for series operation with local and re- mote sensing.

WARNING

When power supplies are connected in series, and the load or one of the output terminals is grounded, no point may be at a greater potential of +/-60VDC from ground for models up to 60VDC Rated Output and +/-600VDC from ground for models >60VDC Rated Output. When using RS232/RS485 or IEEE, refer to the OUTPUT TERMINALS GROUNDING warning in Section 3.9.11.

+LS	+S
POWER	+	(*)
SUPPLY	-
-LS	-S
+LS	+S
POWER	+	(*)
SUPPLY	-
-LS	-S

+

LOAD

-

(*)Diodes are user supplied.

+LS	+S
POWER	+	(*)
SUPPLY	-
-LS	-S
+LS	+S
POWER	+	(*)
SUPPLY	-
-LS	-S

+

LOAD

-

Fig.5-1: Series connection, local sensing Fig.5-2: Series connection, remote sensing

Remote programming in series operation for increased output voltage:

1. Programming by external voltage:

The analog programming circuits of this power supply are referenced to the negative output potential. There- fore, 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 isolated interface 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 con- nected in series.

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83-507-013 Rev. D