FAQ No. FAQ01857
Question
What is soft start?
Answer
Soft start is a function that enables smoother starting by suppressing the
inrush current when the load power supply is turned ON. Soft starts are
particularly useful for loads with large inrush currents, such as halogen
lamps.
The G3PX Power Controller has soft start, soft up, and soft down functions
that adjust the soft start time and the up/down times using hardware
adjustments. This prevents sudden changes to outputs, which shorten heat
life.
A halogen lamp has three to five times more inrush current if it does not
have a soft start function. (The inrush current time is short.)
Such a large inrush current has a huge impact on the G3PX itself and the
system.
If the halogen lamp is used with a soft-start function it gradually turns
ON, starting with the smallest phase angle, as shown in Fig. 2. This is
how the inrush current is suppressed.
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