TDK 750W HALF RACK Parallel Operation, Basic parallel operation, Setting up the Master unit

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 output po-
		tential. 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 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.
3.	Programming by external resistor:	Programming by external resistor is possible. Re-
		fer to section 6.5 for details.
4.	Programming via the Serial	The communication port is referenced to the
	Communication port (RS232/RS485):	IF_COM which is isolated from the power supply
		output potential. Therefore power supplies con-
		nected in series can be chained using the Re-
		mote-In and Remote-Out connectors. Refer to
		chapter 7 for details.

5.15 PARALLEL OPERATION

Up to four units of the same VOLTAGE and CURRENT rating can be connected in parallel to provide up to four times the Output Current capability. One of the units operates as a Master and the remaining units are Slaves. The Slave units are analog programmed by the Master unit. In remote digital operation, only the Master unit can be programmed by the computer, while the Slave units may be connected to the computer for voltage, current and status readback only. Fol- low the following procedure to configure multiple supplies for parallel operation. Refer to Sec. 5.15.1 and to Sec. 5.15.2 for detailed explanation.

5.15.1 Basic parallel operation

In this method, setting the units as Master and Slaves is made by the rear panel J1 connections and the setup switch SW1. Each unit displays its own output current and voltage. To program the load current, the Master unit should be programmed to the total load current divided by the num- ber of units in the system. Refer to the following procedure to configure multiple supplies for basic parallel operation.

1.Setting up the Master unit

Set the Master unit Output Voltage to the desired voltage. Program the Output Current to the desired load current divided by the number of parallel units. During operation, the Master unit operates in CV mode, regulating the load voltage at the programmed Output Voltage. Connect the sensing circuit to local or remote sensing as shown in Fig.5-4 or fig.5-5.

2.Setting up the Slave units

-1. The Output Voltage of the Slave units should be programmed 2-5% higher than the Out- put Voltage of the Master unit to prevent interference with the Master unit’s control. The Out- put Current setting of each unit should be programmed to the desired load current divided by the number of parallel units.

-2. Set the rear panel setup switch SW1 position 2 to the up position.

-3. Connect a wire jumper between J1-8 and J1-12 (refer to Table 4-4).

-4. Connect J1 terminal 10(IPGM) of the slave unit to J1 terminal 25(P) of the master unit.

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83-507-5002 Rev. B