- 11 -
TDK-Lambda
HWS-L/BAT Series
INSTRUCTION MANUAL
6-5.
Over Temperature Protection (OTP)
The OTP function (manual reset type) is provided. When ambient or internal temperature rises abnormally, OTP
function operates and output will be shut down. After shut down, remove the input and cool it down to reset OTP. then re-
input.
6-6.
Power Failure Detection Circuit (ALM)
Power failure detection circuit is provided. ALM (Alarm
when converter stops and Fan Stop. Please take note in parallel or N+1 operation at light load condition, maybe only one
of the power supply operates and other power supply stops. When the built-in FAN motor of this power supply unit stops,
ALM
igh too. If the output voltage is decreased to less than 20% of rated voltage, or decreased
rapidly through an external adjustment mechanism when load is light, the
The ALM signal
is isolated from input and output by a photo-mosfet. It uses the open collector method shown as below.
ALM Signal circuit
6-7.
Remote Sensing (+S, -S terminal)
This function compensates voltage drop of
-
-
-
side line) shall be less than 0.3V. In case that sensing lines are too long, it is necessary to put an electrolytic capacitor in
following places.
1)
Across the load terminal,
2)
3)
B
terminal.
When the function of remote sensing is not in used, cS terminal to +Vm terminal, and S terminal to Vm
terminal by the attachment connector.
If remote sensing terminals are opened, the stability and the accuracy of the output deteriorated. Therefore, terminal +S,
-S must be connected.
6-8.
Remote ON/OFF Control
Remote ON/OFF control is provided.
Using this function, output on/off is allowed to control without input voltage on/off.
1. The maximum input voltage to CNT2 terminal is 12V, and the maximum allowable reverse voltage is -
1V; Current flow into CNT2 is 5mA typical and 12mA maximum.
2. A switch and relay or a transistor can be used as ON/OFF switch.
3. Remote ON/OFF control circuit is isolated from the input and output by a photo-coupler and can be
controlled regardless of the output potential (+ or -). Connect TOG terminal to ground of control signal.
ALM
(Drain)
G1
(Source)
Vmax=50V
Imax=10mA
