Phase-Angle Firing (VAR)
Depending on the prescribed setpoint, the sine oscillation of the mains voltage is
gated using a larger or smaller control angle α. This operating mode is characterized
by high control dynamics.
Figure 5‑42. VAR waveform
STARTING MODES
The Thyro-PX power controller has enhanced starting modes that are used with
special loads. These modes are used when the unit is started or restarted, and the
restart behavior can be configured.
RAMP Starting Mode
This starting mode begins with a specially configured, one-time block, normally in
the form of a ramp (default). It is used to symmetrize transformers during restart. It
can be configured in the same manner as the standard TAKT. See also “Operating
Modes” on page 5‑42.
MOSI Starting Mode
The MOSI starting mode is used for sensitive heating materials with a high R
warm
/
R
cold
ratio, such as molybdenum disilicide. The power controller limits the maximum
current to the load during the low-resistance heating-up phase, and then automatically
switches to the set operating mode.
SETPOINT CONTROL
The setpoint control characteristic of the Thyro-PX power controller is easily adapted
for the control output signal of the upstream process controller or automation system.
All typical control voltage and control current signals can be used. Inverted operation
(ending value is smaller than the starting value in voltage or current) is also
supported.
The effective setpoint is the total setpoint. It is formed by adding the three setpoints
as shown in Figure 5‑43.
Advanced Energy
®
Thyro-PX
®
Power Controller
57010148-00G Installation, Setup, and Operation 5‑43
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