AMETEK XG Family Programmable DC - Manual (Page 95)

Local Operation
M370430-01 Rev E 3-49
3
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.