Firing Type; Zero Crossing; Single Cycle - CD Automation Revo C 3PH User Manual

13 Firing type

Choose an correct firing type allows to optimize the thyristor unit for the installed load.
The firing type has already configured in line with customer requirements that are defined in the Order
Code. The Order Code is written on the identification label.
However, if you wish to change the firing type you can use the software configurator or the Control
Panel.
Caution: this procedure must be performed only by qualified persons.

13.1 Zero Crossing

ZC firing mode is used with Logic Output from temperature controllers and the Thyristor operates like
a contactor.
The Cycle time is performed by temperature controller. ZC minimizes interferences because the
Thyristor unit switches ON-OFF at zero voltage.
ON OFF

13.2 Single Cycle

Single Cycle it's the faster zero crossing switching method in relationship of the power demand from a
temperature regulator or from an external signal.
With input signal at 25% the output is one cycle ON and three cycles OFF
With input signal at 50% the output is one cycle ON and one cycle OFF
With input signal at 75% the output is three cycles ON and one cycle OFF
With input signal at 76% the output is the same of 75% but for each ON cycle the microprocessor
divides 76/75, and when the sum of rests is one, the unit does one more cycle ON. For this firing is
necessary to have analog input.
The Single Cycle is used to control the loads with low inertia or for infrared lamps to short wave.
ON OFF
Neut-Eng-REVO-C-3PH-300-800A-Thyristors-Units
REVO C
VOLTAGE SUPPLY (V)
LOAD VOLTAGE (V)
SSR from controller
VOLTAGE SUPPLY (V)
LOAD VOLTAGE (V)
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User's Manual
25%
50%
75%
100%