AMETEK SGA Series - Manual (Page 78)

Operation Sorensen SGA Series
3-28 M550129-01 Rev AG
3.10
FLOATING AND POLARIZED OUTPUT
The SGA Series supply can be set up for a Positive or Negative supply,
as well as standard operation as a floating output supply.
F LOATING O UTPUT
The output terminals are normally floating from chassis ground. No extra
steps or connections are required for a floating output.
P OSITIVE S UPPLY S ETUP
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.
N EGATIVE S UPPLY S ETUP
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 Section 1.2.2 for additional information.