2.8 Remote Sensing
¿
PBA10F, PBA15F, PBW15F, PBA30F,
PBW30F, PBA50F, PBW50F and PBA75F
¡
These models do not have a remote sensing function.
¿
PBA100F and PBA150F
¡
Option -K is available (for -3R3 and -5) to support a remote sens-
ing function. Please see ”7. Options” for details.
¿
PBA300F, PBA600F, PBA1000F and PBA1500F
¡
These models have a built-in remote sensing function.
If you do not use the remote sensing function, you can short out
bS and +M and between -S and -M on CN1.
When the power supplies are shipped from a factory, they come
with a dedicated harness (H-SN-19) being mounted on CN1. If
you do not use the remote sensing function, you can use the
power supplies as they are.
¡
Please see Fig.2.4 if you do not use the remote sensing function.
Please see Fig.2.5 if you use the remote sensing function.
¡
When you use the remote sensing function, please wire from
+S and -S on CN1. Harnesses are available for your purchase.
Please contact us for details.
When you use the remote sensing, please note the followings.
1
Wire carefully. When a connection of a load line becomes loose
(due to such factors as loose screw), the load current flows to
the sensing line and internal circuits of the power supply may be
damaged.
2
Use a sufficiently thick wire to connect between the power sup-
ply and the load and keep the line drop at 0.3V or below.
3
If the sensing line is long, connect C1 and R1.
4
Use a twisted pair wire or a shielded wire as the sensing line.
5
Do not draw the output current from +M, -M, +S or -S.
6
When the remote sensing function is used, the output voltage
of the power supply may show an oscillating waveform or the
output voltage may dramatically fluctuate because of an imped-
ance of wiring and load conditions.
Please check and evaluate carefully before using the remote
sensing function.
If the output voltage becomes unstable, we suggest you to try
the followings.
-
Remove the remote sensing line on the minus side and short
out between -S and -M.
-
Connect C1, R1 and R2.
Please contact us for details.
3
If the output voltage is turned off through the remote ON/OFF
circuit, the built-in fan stops.
In the case of PBA300F, the fan slows down when the output
voltage is turned off through the remote ON/OFF circuit.
4
If the output voltage is turned off through the remote ON/OFF
circuit, PG signals turn to ”High.”
5
Description in this section is based on the assumption that you
will use one unit alone. If you are planning to use the units
in parallel operation or use multiple units for a single system,
please check necessary voltage and current values.
6
If voltage or current of a value not listed in Table 2.1 is applied
between RC2 and RCG, the output voltage may not be gener-
ated normally.
Unit type
Instruction Manual
A-36
PB
Unit type
Instruction Manual
A-37
PB
(a)
(b)
(c)
Fig.2.3 Examples of connecting
remote ON/OFF circuit
(Example V1:5V R1:620
W
)
Please use Optional harness
(H-SN-24)
(
)
Fig.2.4 When not using remote sensing function
Fig.2.5 When using remote sensing function
+M
Short at CN1
(H-SN-19)
+S
-S
CN1
-M
+V
-V
Load
C
1
+M
Wire the se lines as close
as possible
+S
-S
CN1
-M
+V
-V
Load
C
1
R
2
R
1
Table 2.1 Specifications of remote ON/OFF
SW close
(0.5V min)
SW open
(0.1mA max)
SW open
(0.1mA max)
SW close
(3mA min)
Output on
Output off
SW open
(0.1mA max)
SW close
(3mA min)
SW Logic
pin
Connection method
Fig.2.3 (a)
Fig.2.3 (b)
Fig.2.3 (c)
RCG
AUXG
RCG, AUXG
SW
RC1
RC2
R1
V1
2.2k
W
AUX
AUXG
RCG
150
W
typ
12V
SW
RC1
RC2
2.2k
W
AUX
AUXG
RCG
150
W
typ
12V
SW
RC1
RC2
2.2k
W
AUX
AUXG
RCG
150
W
typ
12V