Advanced Parallel Operation - Delta D750 User Manual

User Manual
D750
DC Power Supply
-5. 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 is designed
so that each unit supplies up to 95% of its current rating because of the imbalance
which may be caused by cabling and connections voltage drop.
-6. Connect J1 terminal 23 (IPGM_RTN) of the slave unit to J1 terminal 12 (COM) of
the master unit.
3. Setting Over Voltage protection
The master unit OVP should be programmed to the desired OVP level. The OVP of the
slave units should be programmed to a higher value than the master OVP. When the
master unit shuts down, it programs the slave unit to zero output voltage. If a slave unit
shuts down (when its OVP is set lower than the master output voltage), only that unit
would shut down and the remaining slave units would supply all the load current.
4. Setting Foldback protection
Foldback protection if desired, may only be used with the master unit. When the
master unit shuts down it programs the slave units to zero output voltage.
5. Connection to the load
In parallel operation, power supplies can be connected in local or remote sensing.
Refer to Fig.3-8 and 3-9 for typical connections of parallel power supplies. The figures
show connection of two units, however the same connection method applies up to 4
units.

3.4.2.2 Advanced parallel operation

In this method, multiple supplies can be configured to parallel operation as a single power
supply. The total load current and output voltage are displayed by the Master unit and can
be read back from the Master unit. The Slave units display only their operating status (On,
Off or Fault condition). Refer to the following procedure to configure multiple supplies for
Advanced parallel operation.
1. Basic configuration
Repeat steps 1 to 6 in Sec. 3.4.2.1 (Basic parallel operation).
2. Setting the units as Master or Slave
a) Depress and hold the FINE button for 3 seconds. The Master/Slave configuration
will be displayed on the Current Display. Rotate the CURRENT encoder to obtain
the desired mode. Refer to Table 3-7 for the CURRENT display and modes of
operation.
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