Sorensen SGI Series Operation
M550221-01 Rev U 3-53
3.15 Floating and Polarized Output
The SGI Series supply can be set up for a Positive or Negative supply, as well
as standard operation as a floating output supply.
FLOATING OUTPUT
The output terminals are normally floating from chassis ground. No extra
steps or connections are required for a floating output.
POSITIVE SUPPLY SETUP
Attach the negative output terminal to the supply chassis. The output
reference is now chassis ground. When the output voltage is set or
programmed, the supply will output a positive potential from chassis ground.
NEGATIVE SUPPLY SETUP
Attach the Positive output terminal to the supply chassis. The output
reference is now chassis ground. When the output voltage is set or
programmed, the supply will output a negative potential from chassis
ground.
CAUTION!
The negative output terminal may be floated up to ±300V (PK), maximum,
with respect to chassis ground. Exceeding the limit will be detected as a
fault by a protective supervisory monitor and shutdown of the output will
be executed; this condition will be latched, requiring reset to resume
normal operation.
CAUTION!
Floating the negative output terminal subjects the internal control circuitry of
the power supply to the same potential as present at the negative output
terminal. In a unit with the standard Non-Isolated Analog Interface, the signals
of control connector, J1, would float at the same potential as the negative
output terminal. Damage might occur if the signals of the Non-Isolated Analog
control connector are connected to an external ground referenced device, due
to unintentional ground loop currents that this connection could generate. To
correct ground loop problems, it is advised to use the optional Isolated Analog
Interface in order to isolate the external signals from the internal control
circuitry of the supply. Refer to the Section 1.2.2 for additional information.
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