Datasheet

CT10.241
C-Series
24V, 10A, THREE PHASE INPUT
23. APPLICATION NOTES
23.1. PEAK CURRENT CAPABILITY
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 20A for 50ms, typ. Fig. 23-2 Peak load 50A for 5ms, typ.
10ms/DIV
Output
Voltage
Output
Current
24V
0A
20A
6V
1ms/DIV
Output
Voltage
Output
Current
24V
0A
50A
3V
Peak load 20A (resistive) for 50ms
Output voltage dips from 24V to 6V.
Peak load 50A (resistive) for 5ms
Output voltage dips from 24V to 3V.
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. (E
lectro 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.
Jan. 2010 / Rev. 1.3 DS-CT10.241-EN
All parameters are specified at 24V, 10A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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