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11 Appendix
96
Pulse width controller (output is active for X > W and a P control structure)
If the process value X exceeds the setpoint W, the P controller will control
proportionally to the control deviation. On going outside the proportional
band, the controller operates with an output level of 100% (100% duty cycle).
Pulse frequency controller (output is active for X > W and a P control structure)
If the process value X exceeds the setpoint W, the P controller will control
proportionally to the control deviation. On going outside the proportional
band, the controller operates with an output level of 100% (max. switching
frequency).
Special controller functions
The following functions can be activated in this menu:
- Manual mode (activate controller outputs manually), see section 6.6
"MANUAL mode / simulation mode", page 33
- Separate controllers (see below)
- I-component switch-off (see below)
Process value X
Setpoint W
Proportional band X
P
100%
50%
0%
Output level y
Switching period
10%
90%
90%
10%
t
On
50%
50%
t
Off
10%
90%
X
P
X - W
0
1
100%
50%
0%
No pulses
50% of pulse frequency
Maximum pulse frequency
Setpoint W
Proportional band X
P
X
P
X - W
0
1
Output level y
Process value X
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