INSTRUCTION MANUAL
RWS1000B
•
1500B Series
TDKLambda
<Page>
613. Remote Sensing (+S, S terminal)
Remote Sensing function is provided.
This function compensates voltage drop of wiring from output terminals to load terminals. Connect "+S" terminal
to "+" terminal of load and "S" terminal to "" terminal of load with sensing wires.
The total line voltage drop (+ side line and side line) shall be less than 0.3V.
In case that sensing line is too long, it is recommended to connect electrolytic capacitor in the following locations:
1) Across the load terminal,
2) Between "+S" terminal and "+Vm" terminal,
3) Between "S" terminal and "Vm" terminal.
Connect "+S" terminal to "+Vm" terminal, "S" terminal to "Vm" terminal with short pieces when remote
sensing function is not used. If disconnected, OVP function may trigger and voltage will be shut down.
614. Low Output Voltage Detection Signal (PF Signal)
Low output voltage detection signal is provided on option model /FO and /RFO. Power Fail (PF) signal will
turn “High” level to indicate the abnormal status when the output voltage becomes Less than 80% of rated
value caused by either the drop or brownout of the input voltage , OCP, OVP or Delay Shut Down operation.
When the builtin FAN motor of this power supply unit stops, PF signal will turn to “High”. The PF signal is
isolated from input and output by a photocoupler. It uses the open collector method shown in below.
615. Remote ON/OFF Control
Remote ON/OFF control function is provided on option model /R, /RFO and /S.
Using this function allows the user to turn the output on and off without having to turn the AC input off and on.
It is controlled by the voltage applied to +R and R. This circuit is in the secondary side of the power supply
unit.
Never connect to primary side.
/R, /RFO
18/23
+R & R terminal condition
Fan condition
SW ON (Higher than 4.5V)
Operate
SW OFF (Lower than 0.5V)
Not Operate
Output condition
ON
OFF
External voltage : E
4.5 ~ 12.5VDC
12.5 ~ 24.5VDC
External resistance : R
No required
1.5kΩ
Vce max = 50V
Ic max = 5mA
E
Power supply
780Ω
+R
R
SW
R
R : External resistans
E : External voltage
