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5.14.1 Series connection for increased output voltage
In this mode, two units are connected so that their outputs are summed. Set the current limit of
each power supply to the maximum that the load can handle without damage. It is recommended
that diodes be connected in parallel with each unit output to prevent reverse voltage during start up
sequence or in case one of the units shuts down. Each diode should be rated to at least the power
supply rated output voltage and output current. Refer to Fig.5-1 and 5-2 for series operation with
local and remote sensing.
Fig.5-1: Series connection, local sensing Fig.5-2: Series connection, remote sensing
Remote programming in series operation for increased output voltage:
1. Programming by external voltage:
The analog programming circuits of this power supply
are referenced to the negative Sense (-S) potential.
Therefore, the circuits used to control each series
connected unit must be separated and floated from
each other.
2. Using the SO function and PS_OK signal: The Shut-Off and PS_OK circuits are referenced to
the isolated interface common, IF_COM (J1-2,3). The
IF_COM terminals of different units can be connected
to obtain a single control circuit for the power supplies
connected in series.
3. Programming by external resistor:
Programming by external resistor is possible. Refer to
section 6-5 for details.
4. Programming via the Serial
The communication port is referenced to the IF_COM
Communication port (RS232/RS485):
which is isolated from the power supply output
potential.
Therefore power supplies connected in series can be
chained using the Remote-In and Remote-Out
connectors.
Refer to chapter 7 for details.
WARNING
When power supplies are connected in series, and the load or one of the output
terminals is grounded, no point may be at a greater potential of +/-60VDC
from ground for models up to 60VDC Rated Output and +/-600VDC from
ground for models >60VDC Rated Output. When using RS232/485 or IEEE,
refer to the OUTPUT TERMINALS GROUNDING warning, section 3.9.11.
Summary of Contents for PU100-7.5
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