CP20.245-R2
CP-Series
24V,
20A,
S
INGLE
P
HASE
I
NPUT
Aug. 2022 / Rev 1.1 DS-CP20.245-R2 EN
All parameters are typ. values specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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24.6.
S
ERIES
O
PERATION
Power supplies of the same type can be connected in series for higher output voltages. It is possible to connect as
many units in series as needed, providing the sum of the output voltage does not exceed 150Vdc. Voltages with a
potential above 60Vdc are not SELV anymore and can be dangerous. Such
voltages must be installed with a protection against touching.
Avoid return voltage (e.g. from a decelerating motor or battery) which is
applied to the output terminals.
Keep an installation clearance of 15mm (left / right) between two power
supplies and avoid installing the power supplies on top of each other. Do
not use power supplies in series in mounting orientations other than the
standard mounting orientation (input terminals on bottom of the unit).
Pay attention that leakage current, EMI, inrush current, harmonics will
increase when using multiple power supplies.
24.7.
P
ARALLEL
U
SE TO
I
NCREASE
O
UTPUT
P
OWER
Power supplies can be paralleled to increase the output power. For
redundancy applications one extra power supply is always needed for
sufficient output current in case one unit fails.
The unit is permanently set to “parallel use” mode in order to achieve
load sharing between power supplies connected in parallel. The “Parallel
use” mode regulates the output voltage in such a manner that the voltage
at no load is approx. 4% higher than at nominal load. See also chapter 6.
Energize all units at the same time to avoid the overload Hiccup
PLUS
mode.
It also might be necessary to cycle the input power (turn-off for at least
five seconds), if the output was in Hiccup
PLUS
mode due to overload or
short circuits and the required output current is higher than the current of one unit.
Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the power
supplies on top of each other.
Do not use power supplies in parallel in mounting orientations other than the standard mounting orientation (input
terminals on bottom of the unit) or in any other condition where a derating of the output current is required (e.g.
altitude).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
Do not load paralleled power supplies with higher currents as shown in the following diagrams:
Fig. 24-5
Output current vs. ambient temp. for
two paralleled units
Fig. 24-6
Output current vs. ambient temp.
for three paralleled units
Allowed output current for two paralleled units
0
30
40
50
60
70°C
8A
16A
24A
32A
40A
48A
B
A
Ambient Temperature
A... continuous
B... short term (max. 5s)
36.6
28A
Allowed output current for three paralleled units
0
30
40
50
60
70°C
12A
24A
36A
48A
60A
72A
B
A
Ambient Temperature
A... continuous
B... short term (max. 5s)
36.6
42A
Unit A
Unit B
-
+
-
+
Load
+
-
Input
Output
Input
Output
Unit A
Input
Output
Unit B
-
+
-
+
Load
+
-
Input
Output