CS20.241, CS20.241-A1
C-Series
24V,
20A,
S
INGLE
P
HASE
I
NPUT
Preliminary
24.
A
PPLICATION
N
OTES
24.1.
P
EAK
C
URRENT
C
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. 24-1
Peak load with 2x the nominal
current for 50ms, typ.
Fig. 24-2
Peak load with 5x the nominal
current for 5ms, typ.
10ms/DIV
Output
Voltage
Output
Current
24V
0A
40A
16V
15ms
1ms/DIV
Output
Voltage
Output
Current
24V
0A
100A
19.6V
Peak load 40A (resistive) for 50ms
Output voltage dips from 24V to 16V.
Peak load 100A (resistive) for 5ms
Output voltage dips from 24V to 19.6V.
Fig. 24-3
90A Peak load for 50ms, typ.
10ms/DIV
Output Voltage
Output Current
24V
0A
90A
High Overload Current (typ. 90A for
15ms) enables easy fuse tripping
Please note: The DC-OK relay triggers when the voltage dips more than 10% for longer than 1ms.
Jan. 2012 / Rev. 0.5 DS-CS20.241-EN
Preliminary
All parameters are specified at 24V, 20A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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