Datasheet

CP10.121
CP-Series
12V, 16A, SINGLE PHASE INPUT
24. APPLICATION NOTES
24.1. PEAK CURRENT CAPABILITY
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.
Output
Voltage
12V
Output
Voltage
12V
8.6V
32A
Output
Current
0A
Output
Current
21/26
10ms/DIV
1ms/DIV0A
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.
12V
10ms/DIV
Output Voltage
Output Current
0A
12ms
48A
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
Jun. 2015 / Rev. 1.0 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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