3 Peak Current
4.1 Series Operation
¡
You can use a power supply in series operation. The output cur-
rent in series operation should be lower than the rated current of a
power supply with the lowest rated current among power supplies
that are serially connected. Please make sure that no current ex-
ceeding the rated current flows into a power supply.
4 Series/Parallel
Operation
¿
PBA300F-24, PBA600F-24, PBA1000F-24
and PBA1500F-24/36
¡
The units can generate the peak current under the following con-
ditions.
-
AC170 - 264V
-
t1
[
10 [sec]
-
Ip
[
Rated peak current
-
Iave
[
Rated current
-
Duty=
t1
X
100 [%]
[
35%
t1+t2
2.9 Alarms
¿
PBA300F, PBA600F, PBA1000F and PBA1500F
¡
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.
¡
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 and PBA1500F ….. 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 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”.
¡
The PG signal (Alarm) circuit is isolated from input, output, FG,
RC and AUX.
Unit type
Instruction Manual
A-38
PB
Unit type
Instruction Manual
A-39
PB
Fig.4.1 Examples of connecting in series operation
Fig.3.1 Peak current
Load
(a)
(b)
Load
Load
Power
Supply
+
-
Power
Supply
+
-
Power
Supply
+
-
+
-
Power
Supply
[A]
Output current
Ip:Peak current
Iave:Average current
t1
t2
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
p r o t e c t i o n o r o v e r c u r r e n t
protection functions.
Open collector method
Good: Low
(0.5V max at 10mA)
Bad : High or Open
50V 10mA max
100k
W
0.1 F
PG
PGG
Fig.2.6 Internal circuit of PG
