49
5-6. Output Voltage Remote Sensing
The PSF Series power supply unit has an output voltage remote
sensing function. It eliminates influences of voltage drop between the
power supply unit and load, which is caused by the contact resistance
or the resistance of the load cable conductors.
It compensates for a voltage of 1V on the single side.
CAUTION
When the voltage remote sensing function is used, the voltage at the front
and rear output terminals of the power supply unit must not exceed the
rated voltage. Be very careful. If the load is too far from the power
supply unit, inductance and capacity of the load cables may cause
oscillation. To avoid such oscillation, connect an electrolytic capacitor of
several hundred
μF to several thousand μF to the load terminals.
(1) Make sure that the POWER switch is off before starting work.
(2) Disconnect the wire that short-circuits the + and +S terminals or
- and -S terminals of four-terminal block on the left of the output
terminals on the rear panel.
(3) Connect the positive sensing terminal (+S) with the positive side of
the load and the negative sensing terminal (-S) with the negative
side of the load as shown below. If the sensing wires are
disconnected, control becomes unstable and voltage over the set
voltage is applied to the load. Connect the sensing wires firmly.
※
Current of approximately 1mA flows through the sensing wires
at the rated output voltage. Use AWG 26 to 18 wires as the
sensing wires
．
◆
See Section
“5-2. Connecting Load with Output Terminals” above.
+S
+
-
-S
Load
＋
＋
OUTPUT
－
OUTPUT
Shielded cable or
Twisted pair wires
Fig.5-13 Remote Sensing Connection
