Local Operation
3-44
M370046-01
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.
Setting up the Master 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 command.
The SCPI command (s) for these instructions are:
[[:]SOURce[<channel>]]:COMBine:CSHare[:MODE]
Setting up the Slave Units
The output voltage and current of the slave units should be programmed to
maximum value. During parallel operation, the slave units operate as a
controlled current source following the master unit’s output current.
All slave units must be configured with the SCPI command to enable
current sharing.
The SCPI command (s) for these instructions are:
[[:]SOURce[<channel>]]:COMBine:CSHare[:MODE]
Important:
The slave unit discussed here is not the same as the remote
interface slave described in chapter 5.
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Summary of Contents for XTR 100-8.5
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