Datasheet

CT5.241
CT-Series
3-PHASE, 24V, 5A, 120W
22. APPLICATION NOTES
22.1. PEAK CURRENT CAPABILITY
The unit can deliver peak currents (up to several milliseconds) which are higher than the specified short term currents.
This helps to start current demanding loads. 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.
The peak current capability also ensures the safe operation of subsequent circuit breakers of load circuits. The load
branches are often individually protected with circuit breakers or fuses. In case of a short or an overload in one branch
circuit, the fuse or circuit breaker need a certain amount of over-current to open in a timely manner. This avoids
voltage loss in adjacent circuits.
The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of
the power supply. The capacitors get discharged during such an event, which causes a voltage dip on the output. The
following examples show typical voltage dips for resistive loads:
Fig. 22-1 10A peak current for 50ms, typ.
(2x the nominal current)
Fig. 22-2 25A peak current for 5ms, typ.
(5x the nominal current)
Output
Voltage
Output
Current
24V
22/27
10ms/DIV
10A
18.5V
Output
Voltage
Output
Current
24V
25A
7V
0A
1ms/DIV
0A
Peak current voltage dips Typ. from 24V to 18.5V At 10A for 50ms, resistive load
Typ. from 24V to 13V At 25A for 2ms, resistive load
Typ. from 24V to 7V At 25A for 5ms, resistive load
May 2018 / Rev. 2.0 DS-CT5.241-EN All values are typical figures specified at 400Vac, 50Hz input voltage, 24V, 5A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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