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Functions
9.3 Power output control
9.3.2
Phase angle control
The control mode phase control can be parameterized for controlling the heating elements.
Compared to "zero-point switching", phase control has several advantages, such as even
heat dissipation and prevention of flickering of emitters with low setpoints.
This parameterization is performed for each POM and applies to all channels of the POM.
Operating principle of phase control
The power outputs are controlled in the parts of a half wave: The HCS specifies the switch-
on signal at the corresponding time in every half-wave depending on the setpoint for the
Triac, which is then switched on until the next zero crossing.
Figure 9-2
The setpoints for controlling the power outputs are within a value range of 0% to 100%
(reference value: U
excessively high inrush currents, the power outputs are switched on time-delayed. See
Switch on heating (Page 110).
Note
The control value is based on an ideal sine and not on the actual voltage curve.
Note
The disturbances caused on the supply cables by the phase control are filtered on the line
side. This is necessary to comply with the EU directive for EMC. For example, a
suitable 3-phase filter is:
• TDK/EPCOS B84143A0080R106
108
Phase control
). A setpoint from 1% to 4% results in a control of 5%. To avoid
2
SIPLUS HCS4300 PROFINET/PROFIBUS DP
Operating Instructions, 10/2019, A5E35452705A/005
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