
118
・All specifications are subject to change without notice.
Instruction Manual
HWS
HWS HD
HWS ME
HWS-P
TOG
Relay
Transistor
TTL,
and etc.
Sink current : 3.5mA
CNT
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 termi-
nal 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 out-
put voltage shut down.
When the low output voltage detector protection circuit is trig-
gered, 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.
Output Ripple & Noise
Maximum ripple & noise value in specifi cations is measured according
to measurement circuit specifi ed by JEITA-RC9131A. When Load lines
are longer, ripple & noise becomes larger. In this case, electrolytic ca-
pacitor, fi lm capacitor, etc. might be necessary to use across the load
terminal. The output ripple & noise cannot be measured accurately if
the probe ground lead of oscilloscope is too long.
C3
1.5m
R
C1
+S
+
+
ー
C2
Co-axial cable
Power
Supply
Unit
Bandwidth
Oscillo-
Scope
Load
R : 50Ω
C1 : 4700pF
C2 : 100uF,
C3 : 0.47uF
150mm
ー
S
50Ω
100MHz
Series Operation
For series operation, either method (A) or (B) is possible.
There might be a step in the rise waveform during series operation.
Method
(B)
(Note1)
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
+
ー
Power supply
Power supply
Power supply
Power supply
Load
Load
Load
Method
(A)
(Note1) Please connect a diode for by-pass when using method
(A) of the series operation. Please use the diode with
rated forward current is equal or more than load current
and that the rated maximum reverse voltage is higher
than output voltage for each power supply.
Parallel Operation
Current balancing function is provided. Either of operations mode (A)
or (B) is possible.
(A)To Increase the Output Current
Current balancing function activates by connecting PC-to-
PC terminal and COM-to-COM terminal, and output current of
each power supply is equivalently supplied to load. Wires to PC
terminals shall be as short as possible, same length and twisted.
There is a possibility that output could be unstable caused by
external noise. For this case, disconnect COM terminal and
connect -S terminal from parallel power supply to a single point
on the load. Please refer connection Method (A)-2.
1)Adjust the output voltage of each power supply to be same
value within 1% or 100mV, whichever is smaller.
2) Use same length and type of wires for all load lines.
3) M a x i m u m v a l u e o f o u t p u t c u r r e n t i n p a r a l l e l i s u p
to 80% of all paralleled models.The purpose of the
current balancing function is the static power-up. Therefore
the output voltage might decrease according to the condition
of dynamic load. There might be a step in the rise waveform
during parallel operation.
4) Up to 5 units can be connected in parallel.
(B)To Use as a Backup Power Supply
1) Set power supply output voltage higher by the forward volt-
age drop of diode.
2) Adjust the output voltage of each power supply to be same value.
3) Use within the specifi cations for output voltage and output power.
Method(A)-1
PC
+S
- S
- S
PC
L oad
Power Supply
COM
COM
Method (B)
Power Supply
Load
Io
Vf
Vf
Vo
Vo+Vf
Vo+Vf
Output Power(W)=(Vo+Vf)× Io
PC
+S
+S
-S
-S
PC
Load
Power Supply
COM
COM
Method (A)-2
+S
-S
+S
-S
+S
Isolation Test
Isolation resistance between output and FG (chassis) shall be more
than 100Ω at 500VDC and between output and CNT・PF shall be
more than 10MΩ at 100VDC. For safety operation, voltage setting of
DC isolation tester must be done before the test. Ensure that it is fully
discharged after the test.
CNT TOG PF
PC
L1
FG
L2
L3
CNT TOG PF
Output−FG
(chassis)
500VDC 100MΩ
or more
Output−CNT-PF
100VDC 10MΩ
or more
Isolation
tester
Isolation
tester
+S
+
ー
ーS
PC
L1
FG
L2
L3
+S
+
ー
ーS
HWS
1800T
P79-132.indd 118
09.10.26 10:29:40 AM
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