A-96.250.881 / 070622
AMI Codes-II O3
Program List and Explanations
76
Control upwards/downwards
Setpoint:
User-defined process value (Measured value or flow)
P-Band:
Range below (upwards control) or above (downwards
control) the set-point, within the dosing intensity is reduced from
100% to 0% to reach the set-point without overshooting.
5.2.1.43
Control Parameters: if Parameters = DIS
5.2.1.43.10
Setpoint
: 0.0–500.0 ppb
5.2.1.43.20
P-Band
: 0.0–500.0 ppb
5.2.1.43
Control Parameters: if Parameters = Sample Flow
5.2.1.43.13
Setpoint
: 0–600 B/s
5.2.1.43.23
P-Band
: 0 –200 B/s
Reset time:
The reset time is the time till the step response of a
single 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
suddenly reached by a D-controller.
Range: 0–9’000 sec
Control timeout:
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
5.3 Relay Contacts
5.3.1
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
following parameters:
DIS
Sample flow
