Phase Angle (Pa); Soft Start With Phase Angle (S+Pa) - CD Automation CD3200 User Manual

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10.1 Phase Angle (PA)

The Phase Angle firing allow the control of the power on the load, for this firing the thyristor can be in
conduction only for a part of the voltage cycle.
This part of the voltage cycle is adjustable in function of the input signal from 0 at 100%.
The PA firing is normally used for control the inductive loads, and is also possible control a primary of
transformer coupled with the cold resistances like: Superkanthal, Molybdenum, Platinum, Tungsten or
Quartz Lamp. The only disadvantage with phase angle is the possible generation of interferences that
however can be reduced with opportune filters.
ON OFF

10.2 Soft Start with Phase Angle (S+PA)

This is an additional function to the Phase Angle. The firing angle of the thyristor increase or decrease up
to the final setpoint value.
The Soft start ramp is an important feature to reduce the inrush current with transformers during the
during the cycle of magnetization or with cold resistance that are near to the short circuit when they are
supplied.
ON OFF
100%
0%
CD3200-1PH from 15A to 110A
VOLTAGE SUPPLY (V)
LOAD VOLTAGE (V)
VOLTAGE SUPPLY (V)
Setpoint Value (%)
Load voltage RMS (V)
Ramp Up
OUTPUT VOLTAGE (V)
25
User's Manual
25%
50%
75%
100%
Ramp Down