CP10.121

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:

Fig. 24-1 Peak load with 2x the nominal

current for 50ms, typ.

Fig. 24-2 Peak load with 5x the nominal

current for 5ms, typ.

10ms/DIV

Output

Voltage

Output

Current

12V

0A

32A

8.6V

1ms/DIV

Output

Voltage

Output

Current

12V

0A

80A

7.1V

32A Peak load (resistive) for 50ms

Output voltage dips from 12V to 8.6V.

80A Peak load (resistive) for 5ms

Output voltage dips from 12V to 7.1V.

Fig. 24-3 48A Peak load, typ.

10ms/DIV

Output Voltage

Output Current

0A

12ms

48A

12V

5.8V

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

dips more than 10% for longer than 1ms.

High Overload Current (typ. 48A for

12ms) enables easy fuse tripping

Peak current voltage dips

typ.

from 12V to 8.6V

at 32A for 50ms, resistive load

typ.

from 12V to 7.4V

at 80A for 2ms, resistive load

typ.

from 12V to 7.1V

at 80A for 5ms, resistive load

Feb. 2016 / Rev. 1.1 DS-CP10.121-EN

All parameters are specified at 12V, 16A, 230Vac, 50Hz, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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