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ReFlex Power™
M
5.5.2
ODES OF
FPDC modules operate in standalone mode, functioning as independent DC
power supplies. The outputs are isolated from each other and from any other
adjacent modules, and could be configured for positive, negative, or floating
outputs with respect to the chassis ground. The Mainframe backplane control
and data communications interface is also isolated; therefore, there are no
restrictions as to the physical location of a module within the Mainframe when it
is operated in standalone mode.
O
V
UTPUT
OLTAGE
The FPDC power supply module is capable of operating only in constant–
voltage mode (CV). Hence, the load resistance should be less than or equal to
the specific voltage rating divided by its current rating.
L
C
5.5.3
OAD
ONNECTION
The outputs of the FPDC power supply module are isolated from chassis ground,
allowing positive, negative, or floating outputs with respect to chassis ground.
Connections to the load are made at the front panel output connector terminals.
Ensure that a wire gauge is utilized that can carry the programmed current
without overheating.
R
S
EMOTE
ENSING
Remote sensing of the output voltage is required to meet accuracy and
regulation specifications. The sense leads should be connected to the point in
the load circuit where the voltage is to be precisely regulated. If a distribution
bus is utilized for multiple loads, the point of voltage sensing is important to
ensure that the voltage regulation is acceptable for all of the loads. In general,
the point of sensing is selected to minimize interaction of the various loads
through line drops caused by their load currents.
CAUTION
Operating the power supply with either the positive or negative output
lead at greater than the float voltage specification limit above chassis
ground could result in damage to the module.
W
IRING
Single loads are connected directly to one of the front panel output terminals,
and the FPDC power supply module is configured to operate in the standalone
mode. Twist the load wires or maintain them closely in parallel for their entire
length to minimize parasitic inductance and coupling from external circuits. Use
M380056-01 Rev L
O
PERATION
/
R
CURRENT
EGULATION
C
ONFIGURATIONS
Fixed Power DC Power Supply
5-25
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