5 1-channel closed-loop control – Hach-Lange WTOS P-RTC User Manual
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Parameterization and operation
4.3.5
1-channel closed-loop control
1-channel closed-loop control
CONFIGURE
SELECT SENSOR
Select the sensor installed for the closed-loop control (refer to
CLOSED-LOOP
SETPOINT PO4-P
Desired orthophosphate value in effluent (refer to
)
[mg/L]
GAIN P CONTR.
Proportional gain of the closed-loop control (refer to
INTEGRALTIME
Integral time of closed-loop control (refer to
)
[min]
DERIVATIVE TIME
Derivative time of closed-loop control (refer to
)
[min]
MIN DOS RATE
Minimum flow rate of dosing pump
[L/h]
PRESELECT PROG
Programs 1 to 4 (refer to
PROFILE
Active
when a measurement signal fails
Q-PROFILE
Daily profiles (2 h average) of waste water influent according to feed measurement
signal
[m³/h]
P-PROFILE
Daily profiles of PO
4
-P concentrations, 2 h average (see
[mg/L]
WEEK PROFILE
Percentage daily averages of the phosphate load (refer to
)
[%]
IN- OUTPUTS
DOSING PUMP
MIN PUMP RANGE
Lower threshold of flow rate range
[L/h]
MAX PUMP RANGE
Upper threshold of flow rate range
[L/h]
0/4...20MA
Selection of transfer range according to pump input
CONTROL CYCLE
Control cycle comprising on- and off-time (see
)
[s]
MIN RUNTIME
Minimum on-time of pump (refer to
[s]
FLOW RATE
MIN Q-INFLUENT
Minimum flow rate in inlet according to measurement signal
[m³/h]
MAX Q-INFLUENT
Maximum flow rate in inlet according to measurement signal
[m³/h]
0/4...20MA
Transfer range of 0/4–20 mA current loop, as set in the connected flow measuring instrument.
MIN RET SLUDGE
Minimum flow rate of return activated sludge pump(s) (refer to
[m³/h]
MAX RET SLUDGE
Maximum flow rate of return activated sludge pump(s) (refer to
[m³/h]
Q RET RATIO
Ratio between measured flow rate and return activated sludge volume, for a return
activated sludge volume proportional to the measured flow rate (Refer to
)
[%]
Q INFL SMOOTH
Smoothing of influent signal (refer to
)