-12-
TDK-Lambda
HWS1500 Series
INSTRUCTION MANUAL
5-7. Remote Sensing (+S, -S terminal)
Remote sensing function is provided to compensate for voltage drop across the wiring from the power supply output
terminals to the load input terminals. Connect “+S” terminal to “+” terminal of the load and “-S” terminal to “-” terminal
of the 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 necessary to put an electrolytic capacitor across the load terminals.
Please take note that the electrolytic capacitor has generation of heat etc. done by the ripple current depending on
connected load. Therefore, the electrolytic capacitor must have a ripple current allowance higher than the output ripple
current. If CN01 (or CN02) is in use, teS, -S for CN02 (or CN01) must be in open condition.
When the function of remote sensing is not in used, connect +S terminal to +V terminal, and –S terminal to –V
terminal by the attachment connector.
If remote sensing terminals are opened, the stability and the accuracy of the output deteriorate. Therefore, teS,
-S must be connected.
5-8. Remote ON/OFF Control
Remote ON/OFF control is provided. Output can be remotely switch ON and OFF by using CNT terminal and TOG
terminal even though input is connected. The output is turned to ON when TOG and CNT terminals are shorted and
output is turned to OFF when these terminals are opened. When the function is not used, connect TOG and CNT
terminals with short piece. The standards for this function are as follows. “TOG” terminal is ground for “CNT” terminal.
The Mode of control
CNT Level for TOG Terminal
Output
Built-in Fan Motor
Short or L
（
0
－
0.8V
）
ON
Rotate
Open or H
（
2.4
－
12V
）
OFF
Stop
(1)
TTL compatible. The maximum input voltage to CNT terminal is 12V, and the maximum allowable reverse voltage is
-1V. The sink current of CNT terminal is 3.5mA.
(2)
Output ON/OFF control can be enable by a switch, relay or a transistor ON/OFF. When CNT terminal
－
TOG
terminal is shorted power supply is turn ON, and when CNT terminal
－
TOG terminal is opened power supply is turn
OFF.
(3)
Remote ON/OFF control circuit is isolated from the input and output circuit of power supply.
It is possible to use it regardless of the positive and negative of the power supply output.
Please be aware that if CNT terminal and TOG terminal is short and input voltage is gradually increase, this will
trigger the low output voltage detector protection circuit and will result to output voltage shut down.
When the low output voltage detector protection circuit is triggered, the input power is cut off for a few minutes,
and then power is re-input or remote ON/OFF control signal should be input for recovery of the output.
＋
S
－
S
－
＋
＋
+
－
CNT
TOG
Sink current
：
3.5mA
Relay
Transistor
TTL,
and etc.
