CT5.121

C-Series

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. 23-1 Peak load 16A for 50ms, typ.

Fig. 23-2 Peak load 40A for 5ms, typ.

10ms/DIV

Output

Voltage

Output

Current

12V

0A

16A

7V

1ms/DIV

Output

Voltage

Output

Current

12V

0A

40A

3.7V

Peak load 16A (resistive load) for 50ms

Output voltage dips from 12V to 7V.

Peak load 40A (resistive load) for 5ms

Output voltage dips from 12V to 3.7V.

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 25Vdc. The absorbing energy can be calculated according to the built-in

large sized output capacitance which is specified in chapter 6.

Jan. 2010 / Rev. 1.0 DS-CT5.121-EN

All parameters are specified at 12V, 8A, 400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

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