JUMO AQUIS 500 RS, Operating Manual, Page: 109 / 120

109
12 Appendix
12.3 Term definition
Pulse length controller (output active when x > w and control structure P)
If the actual value x exceeds the setpoint value w, the P-controller controls in
proportion to the control deviation. When the proportional band is exceeded,
the controller operates with an output level of 100 % (100 % cycle ratio).
Pulse frequency controller (output active when x > w and control structure P)
If the actual value x exceeds the setpoint value w, the P-controller controls in
proportion to the control deviation. When the proportional band is exceeded,
the controller operates with an output level of 100 % (maximum switching fre-
quency).
Calibration timers
The calibration time can (optionally) notify of the need to conduct routine cali-
bration. The calibration timer is activated by entering the number of days after
which recalibration should be scheduled (plant or operator-specified).
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