CP20.241-R1, CP20.241-R2, CP20.241-R3,

CP20.242-R2, CP20.242-R2-C1

CP-Series

Jan. 2018 / Rev. 0.2 DS-CP20.241-R2-EN - All parameters are typical values specified at 230Vac, 50Hz input voltage, 24V, 20A output

load, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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P R E L I M I N A R Y

The unit can deliver peak currents (up to several milliseconds) which are higher than the specified short term currents.

This helps to start current demanding loads. Solenoids, contactors and pneumatic modules often have a steady state

coil and a pick-up coil. The inrush current demand of the pick-up coil is several times higher than the steady-state

current and usually exceeds the nominal output current (including the PowerBoost). The same situation applies when

starting a capacitive load.

The peak current capability also ensures the safe operation of subsequent circuit breakers of load circuits. The load

branches are often individually protected with circuit breakers or fuses. In case of a short or an overload in one branch

circuit, the fuse or circuit breaker need a certain amount of over-current to open in a timely manner. This avoids

voltage loss in adjacent circuits.

The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of

the power supply. The capacitors get discharged during such an event, which causes a voltage dip on the output. The

following three examples show typical voltage dips for resistive loads:

Fig. 24-1 40A peak current for 50ms, typ.

(2x the nominal current)

Fig. 24-2 100A peak current for 5ms, typ.

(5x the nominal current)

10ms/DIV

Output

Voltage

Output

Current

24V

0A

40A

16V

24V

Output

Voltage

Output

Current

1ms/DIV

0A

100A

16.5V

Fig. 24-3

60A peak current for 12ms, typ.

(3x the nominal current)

24V

20V

0A

12ms

60A

Output Voltage

Output Current

Please note:

The DC-OK relay might triggers when the

voltage dips below 22Vdc for longer than 1ms.

Peak current voltage dips

typ.

from 24V to 16V

At 40A for 50ms, resistive load

typ.

from 24V to 21V

At 100A for 2ms, resistive load

typ.

from 24V to 16.5V

At 100A for 5ms, resistive load