QT40.361 Datasheet, PDF (22/27 Pages) PULS GmbH – THREE PHASE INPUT

Q-Series
QT40.361
36V, 26.7A, THREE PHASE INPUT
24.2. PEAK CURRENT CAPABILITY
The power supply 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 BonusPower^®). 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 two examples show typical voltage dips:
Fig. 24-3 Peak load with 2x the nominal
current for 50ms, typ.
Fig. 24-4 Peak load with 5x the nominal
current for 5ms, typ.
36V
53.4A
0A
Output
Voltage
27.6V
Output
Current
36V
133.5A
0A
Output
Voltage
17.5V
Output
Current
10ms/DIV
1ms/DIV
53.4A Peak load (resistive) for 50ms
Output voltage dips from 36V to 27.6V.
133.5A Peak load (resistive) for 5ms
Output voltage dips from 36V to 17.5V.
Please note: The DC-OK relay triggers when the voltage dips more than 10% for longer than 1ms.
Peak current voltage dips
typ. from 36V to 27.6V at 53.4A for 50ms, resistive load
typ. from 36V to 17V at 133.5A for 2ms, resistive load
typ. from 36V to 17.5V at 133.5A for 5ms, resistive load
24.3. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 30A (U.S.A.) and 32A (IEC). An external protection is only
required if the supplying branch has an ampacity greater than this. Check also local codes and local requirements. In
some countries local regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 6A B- or C-Characteristic breaker should be chosen.
Dec. 2016 / Rev. 1.3 DS-QT40.361-EN
All parameters are specified at 36V, 26.7A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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