Pplication, Otes – B&B Electronics NTPS-48-5 - Datasheet User Manual

Page 16

CS10.481

C–Series

48V, 5A, S

INGLE

HASE

NPUT

Nov. 2006 / Rev.1.1 DS-CS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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25. A

PPLICATION

OTES

25.1. 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. 25-1 Peak load 10A for 50ms, typ.

Fig. 25-2 Peak load 25A for 5ms, typ.

10ms/DIV

Output
Voltage

Output
Current

48V

10A

38V

1ms/DIV

Output
Voltage

Output
Current

48V

25A

28V

Peak load 10A (resistive) for 50ms

Output voltage dips from 48V to 38V.

Peak load 25A (resistive) for 5ms

Output voltage dips from 48V to 28V.

25.2. C

HARGING OF

ATTERIES

The power supply shall not be used to charge batteries. Choose Q-Series for charging batteries.