Power Supply - TDK-Lambda HWS 1000/ME Series Instruction Manual

(B) Control by External Variable Resistor
"PV" terminal and "COM" terminal usage is the same as explained in section ｢control by external voltage｣. But in
this method voltage for control is supplied through REF terminal. Variable resistor is connected between REF terminal
and COM terminal and the middle point of variable resistor is connected to PV terminal. Please use the output voltage
within 20% - 120% of rated output voltage value (48V model : 20% - 110%). Wires for control lines must be as short as
possible and use twisted wire or shield wire. In addition, maximum variable voltage when control by external variable
resistor is rated output voltage (100%). When output voltage must be externally control to 120% of rated output voltage
(110% for 48V model), please follow the following procedure.
(1) PV terminal and REF terminal is short by using standard connector supplied.
(2) Set the power supply output voltage to maximum value of the output voltage variable range mentioned in
specification standard by adjusting V.ADJ volume at the front panel.
(3) Remove standard connector after input is cut off.
(4) Connect external variable resistor (50kΩ) between REF terminal and COM terminal. Then connect middle point of
external variable resistor to PV terminal.(sensing current is 1.4mA)
＋S
＋
Power
－
supply
－S
REF
PV
COM
When output voltage is over rated value, please make sure that maximum output power is below rated value.
Moreover, when output voltage is below rated value, please make sure that maximum output current is below rated
value.
Please consider the following characteristic during usage.
120%
Rated output : 100%
voltage
80%
60%
Output
voltage
40%
20%
0%
* Output voltage usage below 20% is not a guaranteed. There is a possibility that it cannot be use with certain
product. Please conduct a thorough evaluation test before using it.
Sensing current : 1.4mA
VR1
Variable resistor 50kΩ
Connection method
120% of maximum setting value
0 10000
Variable resistor value for REF-PV（VR1）
Load
110% of maximum setting value
20000 30000
-17-
TDK-Lambda
HWS1000/ME Series
INSTRUCTION MANUAL
40000 50000
[Ω]