Thyristor Control Logic (Switch) - JUMO 709061/8-01-032 Operating Manual

6.11 Thyristor control logic (switch)

Operating mode
Transformer
loads
α input
Time behavior
Example for
mains frequen-
cy
of 50 Hz
Formula (50 Hz)
Formula (60 Hz)
V1.04/EN/00561071 [Thyristor Power Switch TYA 201]
If the power controller is set to
controller operates as an electronic switch.
For as long as the configured digital or analog input is closed, the thyristors
are fired in zero crossing of the mains voltage and are only locked again when
the digital or analog input is opened.
In the case of transformer loads, the first mains voltage half-wave of each
pulse group must be cut. This can take place by configuring α start and enter-
ing a value.
v Chapter 5.1.2 "Power controller"
The phase control angle for each first half-wave can be selected between 0
and 90°.
The full power is switched by closing the digital input. If this is too high for the
case at hand (e.g. in the case of quick heat-up processes), the output power
can be reduced
by cutting all sine waves ("
v Chapter 5.1.4 "Setpoint value configuration"
If only short pulse packages with a defined number of sine wave cycles should
be switched, the digital input (control direction "Open inactive") must be con-
trolled via an optocoupler and the following timing must be observed:
The power controller requires an internal processing time and does not switch
until the next zero crossing occurs. This results in a delay of 25 to 60 ms (see
arrows) between the binary signal and the switching operation of the sine
wave cycle.
Binary signal length for n sine wave cycles = (n • 20 ms) ±5 ms
If the binary signal is, for example, 48 ms long and therefore calculated longer
than for two sine wave cycles, it may be the case that the power controller
switches two or even three sine wave cycles.
Binary signal length for n sine wave cycles = (n • 16.6 ms) ±5 ms
6 Special device functions
r r
Thyristor control
α
input").
Logic (switch), the power
93