Specifications

2.9 Alarms
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PBA300F, PBA600F, PBA1000F, PBA1500F
and PBA1500T
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Alarms (PG signal) are generated from CN3. Please see Table
2.2 for the functions of the alarms. The objective of the PG sig-
nals is to detect whether or not a certain function of a power sup-
ply is working. It takes several seconds to generate the alarm
signals and the timing when the alarm signals are generated is in-
consistent. Please check if the objective of the alarm is achieved.
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Please note the followings when you use the alarms (PG signal).
1
The time it takes until the PG signals turn ”High” vary depending
on models and conditions.
PBA300F and PBA600F
…..
less than 1 second
PBA1000F, PBA1500F and PBA1500T
…..
less than 10 second
2
If the output voltage is turned off through a remote ON/OFF cir-
cuit, the PG signals turn ”High”.
3
The PG signal may turn ”High”, if the output current of one unit
becomes 10% or below of the rated current in parallel operation
(in this case, the fan also stops).
4
If the output voltage is decreased to almost 0V or decreased
rapidly through an external adjustment mechanism when load is
light, The PG signal may turn ”High”.
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PBA100F and PBA150F
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Option -K is available (for -3R3 and -5) to support a remote sens-
ing function. Please see ”7. Options” for details.
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PBA300F, PBA600F, PBA1000F, PBA1500F
and PBA1500T
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These models have a built-in remote sensing function.
If you do not use the remote sensing function, you can short out
between +S 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.
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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.
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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 fl ows to
the sensing line and internal circuits of the power supply may be
damaged.
2
Use a suffi ciently 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 fl uctuate 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.
AC-DC Power Supplies Enclosed type
Instruction Manual
PBA/PBW-38
PBA/PBW
Table 2.2 Description of the alarms (PG signal)
Alarm Output of Alarm
PG
The PG signals are ”Low” when
the power supply operates
normally.
The signals turn ”High” when the
fan stops or the power supply
stops as a result of output voltage
decrease/stop, activation of
thermal protection, overvoltage
protection or overcurrent
protection functions.
One of three phase is open
(PBA1500T)
Open collector method
Good: Low
(0.5V max at 10mA)
Bad : High or Open
50V 10mA max
100kW0.1 F
PG
PGG
Fig.2.6 Internal circuit of PG
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
C1
+
M
Wire the se lines as close
as possible
+
S
-
S
CN1
-
M
+
V
-
V
Load
C1R2
R1
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