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Principle of half-wave control
The power outputs are controlled in half-waves: For each half-wave, the controller supplies
On/Off information to the triac and this switches as specified.
Figure 9-1
The setpoints for controlling the power outputs lie within a value range of 0% to 100%
(reference value: 100 half-waves).
Depending on the specified setpoint, the power outputs are controlled with an equal number
of positive and negative half-waves (reference value: 200 half-waves).
To avoid excessively high inrush currents, the power outputs are switched on time-delayed.
See Switch on heating (Page 110).
A static table is used for control so that a too frequent change of the setpoints can result in a
significantly deviating setpoint. For this reason, the setpoints are only forwarded in time
intervals of approx. 600 ms.
Note
If it is required for an application that a changed setpoint value is applied immediately, you
can switch off this time grid (see Acyclic output data (Page 132)).
When you disable the time scale, you must ensure that the setpoints are not changed too
frequently within the reference period of 100 half-waves.
SIPLUS HCS4300 PROFINET/PROFIBUS DP
Operating Instructions, 10/2019, A5E35452705A/005
Half-wave control example: 33% and 66%
Functions
9.3 Power output control
107
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