Datasheet

CP20.241, CP20.241-C1, CP20.241-S1,
CP20.241-S2, CP20.241-V1, CP20.242
CP-Series
24V, 20A, 480W, SINGLE PHASE
Sep. 2018 / Rev. 1.0 DS-CP20.241-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.
www.pulspower.com Phone [phone] Germany
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. 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)
26/32
10ms/DIV
Output
Voltage
Output
Current
24V
0A
40A
16V
Output
Voltage
Output
Current
24V
1ms/DIV0A
100A
17V
Fig. 24-3 60A peak current for 12ms, typ.
(3x the nominal current)
24V
0A
12ms
20V
60A
Output Voltage
Output Current
Please note: The DC-OK relay might trigger when the
voltage dips more than 10% 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 17V At 100A for 5ms, resistive load