PIC480.241C Datasheet, PDF (18/21 Pages) PULS GmbH – 24V, 20A, SINGLE PHASE INPUT

PIANO-Series
PRELIMINARY
PIC480.241C
24V, 20A, SINGLE PHASE INPUT
23. APPLICATION NOTES
23.1. 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 two examples show typical voltage dips:
Fig. 23-1 Peak load with 2x the nominal
current for 50ms, typ.
24V
Output Voltage
40A
13.5V
Fig. 23-2 Peak load with 5x the nominal
current for 5ms, typ.
24V
100A
Output
Voltage
Output
0A
Current
10ms/DIV
40A Peak load (resistive) for 50ms
Output voltage dips from 24V to 14V.
5.5V
Output
0A
Current
1ms/DIV
100A Peak load (resistive) for 5ms
Output voltage dips from 24V to 4V.
Peak current voltage dips
typ. from 24V to 13.5V at 40A for 50ms, resistive load
typ. from 24V to 7.5V
at 100A for 2ms, resistive load
typ. from 24V to 5.5V
at 100A for 5ms, resistive load
23.2. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply.
It does not matter whether the power supply is on or off.
The maximum allowed feed-back-voltage is 35Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 6.
Jun. 2016 / Rev. 0.2 DS-PIC480.241C-EN
All parameters are specified at 24V, 20A, 230Vac, 50Hz, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone [phone] Germany
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