3 Series Operation and
Parallel Operation
3.1 Series operation
¡
Series operation is available by connecting the outputs of two or
more power supplies with the same output voltage, as shown be-
low. Output current in series connection should be lower than the
lowest rated current in each unit.
¡
Parallel operation is show in Fig.3.1.
2.4 Expectancy life and warranty
¡
Expectancy life
The expectancy life is as follows. The mean of load factor 100%
depends on installation condition, refer to SPECIFICATION.
¡
Warranty
The warranty is 5 years when average ambient temperature of
year is Ta = 40
C
or less and load factor is average 50% or less.
However, the warranty is 3 years when average ambient temper-
ature of year is Ta = 50
C
or less and load factor is series 100%.
2.5 Current monitor
¡
It is possible to monitor load current by measuring CB voltage that
is between CB terminal and -V terminal. The relation between CB
voltage and load current is shown in Figs.2.4 to 2.6.
Note : Figs.2.4 to 2.6 are references, and are not meant to be
taken as guaranteed values.
¡
Ensure that voltage measurement between CB and -V terminals
is carried out with equipment that has suffi cient input impedance
(testers, etc.). If this equipment has low input impedance, then the
relationship between CB voltage and output current will change.
Additionally, please be aware that a short between terminals may
result in damage to internal components.
¡
Please use twist pair cable or shield cable between CB terminal
and -V terminal, or the operation may be mulfunction.
¡
Please use an oscilloscope for pulse loads.
3.2 Parallel operation/master-slave operation
¡
Parallel operation is available by connecting below.
¡
As variance of output current drew from each power supply is
maximum 10%, the total output current must not exceed the value
determined by the following equation.
When the number of units in parallel operation increases, input
current increases at the same time. Adequate wiring design for
input circuitry is required, such as circuit pattern, wiring and cur-
rent capacity for equipment.
In parallel operation, the maximum operative number of units is 5.
AC-DC Power Supplies Enclosed Type
Instruction Manual
ADA-12
ADA
20
40
60
80
Voltage(V)
Load current (A)
20
40
60
80
100
Voltage(V)
Load current (A)
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10
12
14
16
Fig.2.4 Load current conversion graph (ADA600F-24)
Fig.3.1 Examples of series operation
Fig.2.5 Load current conversion graph (ADA750F-24)
Fig.2.6 Load current conversion graph (ADA1000F-24)
The rated
current per unit
=
X
(Number of unit)
X
0.9
Output current in
parallel operation
*
Refer to 2.3 Derating
Power
Supply
+
+
+
+
Power
Supply
Load
Power
Supply
Power
Supply
Load
Load
Installation
condition
Load factor
Convection
*
(Installation A)
Forced air
*
Average ambient
temperature
(year)
50%
Ta = 30
C
Ta = 40
C
Ta = 50
C
Ta = 30
C
Ta = 40
C
Ta = 50
C
100%
More than 10 years
More than 10 years
5 years
More than 10 years
More than 10 years
5 years
More than 10 years
6 years
3 years
More than 10 years
6 years
3 years
10
20
30
40
Voltage(V)
Load current (A)
0
2
4
6
8
10
12
me̲ada1.indd ADA-12
me ada1 indd ADA-12
2015/08/07 9:23:58
2015/08/07 9:23:58
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