1.12 Derating for low temperature start-up
¡
Derating shown in Table 5.5 is required for low temperature start-
up.
Table 1.4 Derating for low temperature start-up
No.
Model
temperature range Load factor
1
KHEA30F, KHNA30F
-40
C
to -20
C
50%
2
KHEA60F, KHNA60F
3
KHEA90F, KHNA90F
4
KHEA120F, KHNA120F
-40
C
to -25
C
75%
5
KHEA240F, KHNA240F
6
KHEA480F, KHNA480F
2 Peak Current
¿
KHEA120F/240F/480F, KHNA120F/240F/480F
¡
The units can generate the peak current under the following con-
ditions.
-
t1
[
5sec
-
Ip
[
Rated peak current
-
Iave
[
Rated current
*
Please use a maximum of Duty following shown in Table 2.1.
-
Duty=
t1
X
100 [%]
t1+t2
[A]
Output current
Ip : Peak current
Iave : Average current
I : Load current
t1
t2
Fig.2.1 Peak current
Table 2.1 Maximum Duty by the mounting orientation
Mounting
orientation
Input
Voltage
Maximum Duty
KHEA120F
KHNA120F
KHEA240F
KHNA240F
KHEA480F-24
KHNA480F-24
KHEA480F-48
KHNA480F-48
A
AC85 - 170V
35%
35%
20%
20%
AC170 - 264V
15%
B
AC85 - 264V
20%
C
AC85 - 264V
5%
D
AC85 - 264V
20%
E
AC85 - 264V
3 Series/Parallel
Operation
3.1 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 the power sup-
plies that are serially connected. Please make sure that no current
exceeding the rated current flows into a power supply.
Load
(a)
(b)
Load
Load
Power
Supply
+
-
Power
Supply
+
-
Power
Supply
+
-
+
-
Power
Supply
Fig.3.1 Examples of connecting in series operation
3.2 Parallel Operation
¡
There is no current balance function.
When operating in parallel, such as diode-OR, please use on the
output voltage was adjusted enough to balance the current.
Exceeds the rated output current, the output is shut down.
¡
Redundancy operation is available by wiring as shown below.
I
2
I
1
I
3
-
+
+
-
Load
Power
Supply
Power
Supply
Fig.3.2 Example of connecting in redundancy operation
Even a slight difference in output voltage can affect the balance
between the values of I
1
and I
2
.
Please make sure that the value of l
3
does not exceed the rated
current of a power supply.
l
3
[
rated current value
AC-DC Power Supplies DIN Rail Type
Instruction Manual
KH-24
June 29, 2020
