Parallel Operation; Basic Parallel Operation - Lambda Genesys GENH 750W Technical Manual

1. Programming by external voltage:
2. Using the SO function and PS_OK signal:
3. Programming by external resistor:
4. Programming via the Serial
Communication port (RS232/RS485):

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 number
of units in the system. Refer to the following procedure to configure multiple supplies for simple
parallel operation.
1. Setting up the Master unit
Set the Master unit Output Voltage to the desired voltage. Program the Output Current to the de-
sired load current divided by the number of parallel units. During operation, the Master unit oper-
ates 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 Output
Voltage of the Master unit to prevent interference with the Master unit's control. The Output
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.
During operation, the Slave units operate as a controlled current source following the Master
Output Current. It is recommended that the power system be designed so that each unit supplies
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.
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.
Programming by external resistor is possible. Re-
fer to section 6.5 for details.
The communication port is referenced to the
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.
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83-507-5002 Rev. A