Parallel Operation; Basic Parallel Operation - Delta D750 User Manual

User Manual
D750
DC Power Supply
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.

3.4.2 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. There are two methods, basic and advanced, to configure multiple supplies for
parallel operation. Refer to Sec. 3.4.2.1 and to Sec. 3.4.2.2 for detailed explanation.

3.4.2.1 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 current limit to
the desired load current limit 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.3-8 or Fig.3-9.
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 current limit of each unit should be programmed to the desired load
current limit divided by the number of parallel units.
-2. Set the rear panel setup switch SW1 position 2 to it's up position.
-3. Set the rear panel setup switch SW1 position 3 in the same position as SW1
position 4 of the master.
-4. Connect short between J1-8 and J1-12 (refer to Table 4-4.)
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