Swann AMI Phosphate-II Operator's Manual page 79

AMI Phosphate-II
Program List and Explanations
5.3.2/3
Limit
upper / lower
5.3.x.2x
5.3.x.3x
5.3.x.4x
5.3.x.5x
Control
upwards /
downwards
5.3.x.2x
5.3.X.3x
Time
proportional
5.3.2.32.20
A-96.250.641 / 290312
Relay 1/2: The function of relay contacts 1 or 2 are defined by the
user
1 First select the functions as:
- limit switch, Limit upper / lower, S. 77
- controller, Control upwards / downwards, S. 77
- timer or Timer, S. 78
- fieldbus driven,
2 Then enter the necessary data depending on the selected func-
tion. The same values may also be entered in menu
64
When the relays are used as upper or lower limit switches, program
the following:
Parameter: select a process value (Phosphate, Sample Flow)
Setpoint: If the measured value rises above respectively falls below
the set-point, the relay is activated.
Range: 0.00–10.00 ppm
Hysteresis: within the hysteresis range, the relay does not switch.
This prevents damage of relay contacts when the measured value
fluctuates around the alarm value.
Range: 0.00–10.00 ppm
Delay: Duration, the activation of the alarm relay is retarded after
the messuring value has risen above/fallen below the programmed
alarm.
Range. 0–600 sec
The relays may be used to drive control units such as solenoid
valves, membrane dosing pumps or motor valves. When driving a
motor valve both relays are needed, relay 1 to open and relay 2 to
close the valve.
Parameter: select a process value (Phosphate, Sample Flow)
Settings: Choose the respective actuator:
 Time proportional,
 Frequency,
 Motor valve,
Examples of metering devices that are driven time proportional are
solenoid valves, peristaltic pumps.
Dosing is controlled by the operating time.
Cycle time: duration of one control cycle (on/off change).
Range: 0–600 sec.
Fieldbus, S. 78
Time proportional, S. 77
Frequency, S. 78
Motor valve, S. 78
Relay 1/2, S.
77