Puls ML15.241 Power Supply 사양 가이드

ML15.241

MiniLine

24V,

0.63A,

INGLE

HASE

NPUT

22. A

PPLICATION

OTES

22.1. P

EAK

URRENT

APABILITY

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.

Branch circuits are often protected with circuit breakers or fuses. In case of a short or an overload in the branch circuit,
the fuse needs a certain amount of over-current to trip or to blow. The peak current capability ensures the safe
operation of subsequent circuit breakers.

Assuming the input voltage is turned on before such an event, the built-in large sized output capacitors inside the
power supply can deliver extra current. Discharging this capacitor causes a voltage dip on the output. The following
two examples show typical voltage dips:

Fig. 22-1 Peak loading with 2x the nominal

current for 50ms, typ.

Fig. 22-2 Peak loading with 5x the nominal

current for 5ms, typ.

Output
Voltage

24.5V

16/21

10ms/DIV

Output
Current

1.3A

15.5V

24.5V

Output
Voltage

Output
Current

1ms/DIV

3.15A

11.5V

Peak load 1.3A (resistive load) for 50ms
Output voltage dips from 24V to 15.5V.

Peak load 3.15A (resistive load) for 5ms
Output voltage dips from 24V to 11.5V.

22.2. B

ACK

FEEDING

OADS

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).

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.

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. However, please note that the output voltage can dip to
zero for approximately 365ms if the back-feed voltage is removed.

Oct. 2009 / Rev. 1.2 DS-ML15.241-EN
All parameters are specified at 24V, 0.63A, 230Vac input, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.