AMETEK SFA Series - Manual (Page 39)

Sorensen SFA Series Operation
This section provides an overview of front panel operation and initial functional
tests of the power supply.
3.2.1 F
LOATING AND
P
OLARIZED
O
UTPUT
The SFA 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!
Floating the negative output terminal floats the power supply’s internal control
circuitry common level to the same potential as the negative output terminal. On a
standard non-isolated supply the common of the analog control connector (J1)
floats at the same potential as the negative output terminal. Damage may occur if
the non-isolated analog control connector of a supply is connected to an external
ground referenced input/output device. Such a connection creates ground loop
currents. To correct ground loop problems the Isolated Analog option is advised in
order to isolate the external ground reference signals from the internal control
circuitry of the supply.
3.2.2 I NITIAL S ETUP
Before connecting the unit to an AC outlet, ensure that the front panel ON/OFF
power switch is in the off position and that the current control knob is fully
counterclockwise. Check the ANALOG CONTROL (J1) mating connector on the
rear panel to verify that pins 5 and 6 (Remote Output On/Off) are shorted
together to enable the output of the supply (see Section 3.5). This is the default
configuration installed from the factory. Apply power to the AC mains input.
M550292-01 Rev G 3-5