Chapter 3 Front-Panel Operation
Remote Voltage Sensing at the Front and Rear Terminals
38
Using remote sensing under certain combinations of load lead lengths and large load
capacitances may cause your application to form a filter, which becomes part of the
voltage feedback loop. The extra phase shift created by this filter can degrade the
power supply’s stability, resulting in poor transient response or loop instability. In
severe cases, it may cause oscillations. To minimize this possibility, keep the load
leads as short as possible and twist them together. As the sense leads are part of the
power supply’s programming feedback loop, accidental open-connections of sense or
load leads during remote sensing operation have various unwanted effects. Provide
secure and permanent connections.
Remote Voltage Sensing Connections
Connections between the power supply sensing and output terminals should be
removed, and using shielded two-wire cable, the power supply sensing terminals
should be connected to the load as shown in Figure 3-2. Do not use the shield as one
of the sensing conductors and the other end should be left unconnected. Connect one
end of the sensing lead shield to the chassis ground (
⊥) only. Opening a sensing lead
causes the power supply output voltage to decrease at the load leads. Observe polarity
when connecting the sensing leads to the load.
For local voltage sensing connections, the (+) and (-) sense terminals must be
connected to the (+) and (-) output terminals respectively.
Note When you make the remote voltage sensing connections at the front or rear panel
terminals, make sure to disconnect all the connections to the load and sense leads
at the other end terminals. Do not make the sensing connections at both front and
rear terminals at the same time. It will cause to damage the power supply seriously.
Note During remote sensing setup, it is strongly recommended to power off (by presssing
power ON/OFF button) the power supply to avoid undesirable damage to the load
or the power supply.
Figure 3-2. Remote Voltage Sensing Connections
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