Swann AMI Phosphate-II Operator's Manual page 75

AMI Phosphate-II
Program List and Explanations
5.2.1.43
5.2.1.43.10
5.2.1.43.20
5.2.1.43.3
5.2.1.43.3
5.2.1.43.3
5.3 Relay Contacts
5.3.1
A-96.250.641 / 290121
Control upwards or downwards
Setpoint: User defined precess value for the selected parameter.
P-Band: Range below (upwards control) or above (downwards con-
trol) the set-point, within which the dosing intensity is reduced from
100% to 0% to reach the set-point without overshooting.
Control Parameters: Process value Phosphate 1
Setpoint:
Range: 0.00 –10.00 ppm
P-Band:
Range: 0.00 –10.00 ppm
Reset time: The reset time is the time till the step response of a sin-
gle I-controller will reach the same value as it will be suddenly
reached by a P-controller.
Range: 0–9'000 sec
Derivative time: The derivative time is the time till the ramp response
of a single P-controller will reach the same value as it will be sudden-
ly reached by a D-controller.
Range: 0–9'000 sec
Control time out: If a controller action (dosing intensity) is constantly
over 90% during a defined period of time and the process value does
not come closer to the setpoint, the dosing process will be stopped
for safety reasons.
Range: 0–720 min
Alarm Relay: The alarm relay is used as cumulative error indicator.
Under normal operating conditions the contact is active.
The contact is inactive at:
 Power loss
 Detection of system faults like defective sensors or electronic
parts
 High case temperature
 Lack of reagents
 Process values out of programmed ranges.
Program alarm levels, hysteresis values and delay times for the fol-
lowing parameters:
Phosphate, Sample Flow or Case Temperature
The alarm values of Phosphate, Sample Flow and Case Tempera-
ture can be programmed in menu as well (5.3.1.3, p. 76).
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