CP10.481

CP-Series

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 two examples show typical voltage dips for resistive loads:

Fig. 24-1

10.8A peak current for 50ms , typ.

(2x the nominal current)

Fig. 24-2 27A peak current for 5ms , typ.

(5x the nominal current)

Output

Voltage

48V

Output

Voltage

48V

24/29

10ms/DIV

Output

Current

0A

10.8A

30.5V

Output

Current

1ms/DIV

0A

27A

25.3V

Fig. 24-3 16A peak current for 12ms , typ.

(3x the nominal current)

48V

10ms/DIV

Output Voltage

Output Current

0A

12ms

16A

19.3V

Please note: The DC-OK relay triggers when the voltage

dips more than 10% for longer than 1ms.

Peak current voltage dips

Typically from 48V to 30.5V

At 10.8A for 50ms, resistive load

Typically from 48V to 30.0V

At 27A for 2ms, resistive load

Typically from 48V to 25.3V

At 27A for 5ms, resistive load

Aug. 2017 / Rev. 1.2 DS-CP10.481-EN

All parameters are specified at 48V, 5.4A, 230Vac, 50Hz, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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