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6.5 System Configuration Screen
The System Configuration screen is the fourth configuration screen and is accessed from the
Sequence Config Screen.
Control Functions
The System configuration screen is used to scale/range and tune the 4-20mA signal received
from the turbidity probe.
‘RAW_MIN’ is minimum raw value received by the PLC from the turbidity probe. This
corresponds to 4mA.
‘ENG_MIN’ is minimum turbidity (mg/L) scaled by the PLC. This corresponds to 4mA.
‘RAW_MAX’ is maximum raw value received by the PLC from the turbidity probe. This
corresponds to 20mA.
‘ENG_MAX’ is maximum turbidity (mg/L) scaled by the PLC. This corresponds to 20mA.
Using these 4 parameters (above) the PLC calculates the scaled turbidity value in mg/L.
‘SETTLED SETPOINT’ (mg/L) is the turbidity reading at which point the sample is deemed to
have settled. When this setpoint is reached, the settling timer is stopped and the settling
time of that sample is recorded.
The operator can select if the Turbidity signal input channel is 4-20mA (default); or 0-10V
(only to be used with Nalco Eco Probe).
The operator can configure which signals are transmitted out from the STORM analogue
output channels. AO1 default is Floc Pump Speed, AO2 default is Coag Pump Speed. Both can
be reconfigured as either Settling Time or Final Turbidity
The operator can save parameter settings in 2 storage files by pressing the ‘SAVE SETTINGS
TO FILE’ buttons. The STORM™ can then load these saved settings by pressing the ‘RETURN
TO’ buttons.
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