Operation Sorensen SGI Series
3-56 M550221-01 Rev U
3.16.2 Series Operation
Series operation is used to obtain a higher aggregate output voltage using two
units. Each supply is operated individually, and is set up as follows:
Connect the negative terminal (–) of one supply to the positive terminal (+) of
the next supply; both units must be of the same model. The total voltage
available is the sum of the maximum voltages of each supply. Each supply
displays its own output voltage, and the load voltage is the sum of each front
panel display.
CAUTION!
Under no condition should the negative (–) output terminal of any
power supply exceed 300 V to chassis (earth) ground. This is
limited by the isolation and creepage/clearance distances internal
to the power supply construction. If a higher output voltage range
is required, contact the factory for availability.
Note:
The maximum allowable current for a series string of power supplies
is the rated output current of a single supply of the string.
Remote sensing at the load should not be used during series
operation. Each power supply should have its remote sense leads
connected to its own output terminals.
An anti-parallel diode (power diode capable of the maximum current
of the series group, connected across the output, but reverse biased) is
recommended to protect against sinking current into a supply should one
supply be “ON” while another other is “OFF.” (Refer to Section 2.6.1).
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