Phase Angle; Soft Start With Phase Angle - CD Automation REVEX PA User Manual

REVEX
PA from 35A to 90A

14.4 Phase Angle

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
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.

14.5 Soft Start with Phase Angle

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 cycle of
magnetization or with cold resistance
that are near to the short circuit when
they are supplied.
Setpoint Ramp Up / Setpoint Ramp
Down.
of transformer
ON OFF
Voltage Supply (V)
Load Voltage (V)
ON OFF
Load Voltage RMS (V)
Ramp Up
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User's manual
Voltage Supply (V)
Setpoint Value (%)
Ramp Down
Output Voltage (V)
25%
50%
75%
100%