ITC WTRTEC Green, Manual

Page: 10 / 24

10
Configuration
OFF
ON
5’
0 25% 50% 75%
10’
Salida al 100%
25% 50% 75%
Salida al 25%
OFF
ON
5’
0 25% 50% 75%
10’
25% 50% 75%
The regulating output will need to be selected for each control channel:
- Out:
Choose between the two 4-20 mA channels for analogue regulation or between the relay outputs for ON/
OFF regulation.
EC CONTROL
CONTROL
PI CONTROL
PH CONTROL
CONTROL
PI CONTROL
ENT
ENT
EC PI CONTROL
PIQ (PEC): 1.5 0
Kp : 2 0
Ki : 3 0
T delay (s): 015
Q test: 00.00 m3 h
PH PI CONTROL
PIQ (PpH) 030
Kp : 20
Ki : 30
T delay: 020 s
Q test: 00.00 m3 h
Out = 4-20mA.
For in-line process control. This is more precise regulation, which requires a pump with a
4-20 mA analogue input, such as a Dositec mA, Dostec AC or Dostec with variable frequency drive.
Out = Relay.
For control in a recirculating tank. The regulating output establishes 5-minute cycles in
which the output will be ON for the proportional part of the time corresponding to PI adjustment.
- Limit out:
If a 4-20 mA output is used, this parameter allows you to limit the output value so as to limit the maximum
dosing pump flow rate.
- Pump:
Enter the rated dosing pump flow rate to record the dosed flow rate in the data logger.
4.4.2. Advanced control configuration. PI control
For adjustment of EC and pH, the control system operates using a PI algorithm. The setting parameters
for this control are in the PI CONTROL menu
- PIQ (PEC):
The PIQ control mode to adjust EC is a PI algorithm conditioned on the flow rate of water to be treated.
Initial dosing proportional to the water rate in % is set using the PEC parameter, and is subsequently
corrected by means of a PI approximation curve. This system combines the benefits of proportional
dosing and EC setpoint dosing, ensuring stability