Series 2268 850 Watt DC Power Supplies Reference Manual
Local Operation
2268S-901-01 Rev. A / January 2015
67
CONFIGURING MULTIPLE SUPPLIES FOR CURRENT SHARING
OPERATION (APG METHOD)
Up to four power supplies can be connected in parallel to increase the output current. One of
the units will operate as the master unit and the remaining units will operate as slave units
controlled by the master unit. The master unit uses the analog programming lines to set the
output voltages and currents of the slave units to match its output.
In remote digital operation, only the master unit can be programmed remotely while the slave
units that are connected remotely will only provide voltage, current and status readback
information.
In APG current sharing topologies, only the master unit can be programmed using any of the
input methods (front panel, remote digital, or analog programming control). The slave unit(s)
voltage and current output(s) are determined by the master unit through the REF_I input to
each slave unit. The readback using any of the monitoring methods (front panel display, user
monitor lines or SCPI measure commands) of each unit (master or slave) will provide
individual unit status, not system status.
Important:
If current sharing is not being used, the unit must be configured as
a controller. Failure to do so will result in unpredictable operation.
Setting up the Controller Unit
Set the output voltage of the master unit to the desired voltage. Program the current set point
of the master unit to the desired load current set point divided by the number of parallel units.
During operation, the master unit operates in Constant Voltage mode, regulating the load
voltage at the programmed output voltage. Send the Current share SCPI command or use the
following instructions to program front panel current share setup:
1.
With the 9-position mode control at the PGM position, press the rotary
Adjust/Enter control.
is displayed on the output voltage display.
2.
Turn the rotary Adjust/Enter control to select
and press the
Adjust/Enter control.
is displayed on the output voltage display.
3.
Turn the rotary Adjust/Enter control to select
in the output current display.
Содержание Keithley 2268 Series
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