Hach-Lange RTC103 N-Module - Manual (Page 44)

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Parameterization and operation
Q RETURN RATIO
Note: 0/4 to20 mA input can be used either for Qreci or for Qras.
If the value Q RETURN RATIO is “0” the RAS flow is calculated
bases on the mA input signal.
If the value is different from “0” the RAS flow is calculated from the
inflow:
Q RETURN = Q RETURN RATIO * INFLOW
within the limits of MIN RETURN SLUDGE and MAX RETURN
SLUDGE.
[%]
CHANNEL 2 same as CHANNEL 1
OUTPUTS
CHANNEL 1
0/4 to 20 mA
Analog outputs to control VFD blowers.
Transfer range of 0/4 to 20 mA current loop
CHANNEL 2 same as CHANNEL 1
VOLUME
CHANNEL 1
VOLUME Aerated volume [m 3 ]
CHANNEL 2
MODBUS
ADDRESS Start address of an RTC within the MODBUS network.
DATA ORDER
Specifies the register order within a double word. Presetting:
NORMAL
DATALOG INTRVAL Indicates the interval in which the data is saved in the log file. [min]
PROGNOSYS
Activate or deactivate PROGNOSYS for RTC control. "Activate"
means if Measurement Indicator from relevant sensor decrease to
50% or lower RTC control do not use this measurement and switch
to adequate fall back strategy.
SET DEFAULTS Restores the factory settings.
MAINTENANCE
RTC DATA
RTC MEASUREMEN
Specifies the value measured by the RTC, e. g. the influent
measurement.
RTC ACTUAT VAR
Specifies the variable calculated by the RTC, e. g. whether the
aeration should be switched on or off.
DIAG/TEST
EEPROM Hardware test
RTC COMM TO Communication time-out
RTC CRC Communication check sum
MODBUS ADDRESS
Here, the address is displayed where the communication actually
takes place. Presetting: 41
LOCATION
Here, a location name can be assigned for better identification of the
RTC module, e.g. activation 2.
4.5.3 2-Channel RTC103 N-Module VFD (Continued)
RTC MODULES / PROGNOSYS
RTC MODULES
RTC