Datasheet

CP10.121, CP10.122
CP-Series
12V, 16A, 192W, SINGLE PHASE INPUT
25. APPLICATION NOTES
25.1. 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 examples show typical voltage dips for resistive loads:
Fig. 25-1 32A peak current for 50ms , typ.
(2x the nominal current)
Fig. 25-2 80A peak current for 5ms , typ.
(5x the nominal current)
Output
Voltage
12V
Output
Voltage
12V
23/28
10ms/DIV
Output
Current
0A
32A
8.6V
Output
Current
1ms/DIV0A
80A
7.1V
Fig. 25-3 48A peak current for 12ms , typ.
(3x the nominal current)
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.
Peak current voltage dips
Typically from 12V to 8.6V at 32A for 50ms with resistive load
Typically from 12V to 7.4V at 80A for 2ms with resistive load
Typically from 12V to 7.1V at 80A for 5ms with resistive load
Aug. 2017 / Rev. 1.3 DS-CP10.121-EN
All parameters are typical values specified at 230Vac, 50Hz input voltage, 12V 16A output, 25°C ambient temperature and
after a 5 minutes run-in time unless otherwise noted.
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