Siemens HydroRanger 200 HMI - Setting the Pump Start Delays; Reducing Wall Cling

Operating
7.9 Pump control
HydroRanger 200 HMI
Operating Instructions, 06/2018, A5E36281317-AC
129
7.9.4.6
Setting the pump start delays
The pump start delay ensures that all of the pumps do not start at once to avoid power
surges. There are two parameters used: Delay Between Starts (2.8.2.8.1.) (Page 207) and
Power Resumption Delay (2.8.2.8.2.) (Page 207). The default is 10 seconds, but you can
increase this if your pumps take longer to spin up.
Example:
The delay between pumps is set to 20 seconds and the delay of the first pump is set to 30
seconds.
Parameter
Index
Value
Description
Delay Between Pump Starts
(2.8.2.8.1.) (Page 207)
Global 20 Wait at least 20 seconds between pump
starts
Power Resumption Delay
(2.8.2.8.2.) (Page 207)
Global 30 Wait for 30 seconds when power is
restored
7.9.4.7
Reducing wall cling
Use the wall cling parameter to randomly alter the ON and OFF setpoints over a range. This
eliminates the ridge of material buildup at the setpoint that can give false echoes. This
setting may increase the number of days between trips to clean the wet well.
Wall cling reduction is set by Level Setpoint Variation (2.8.2.6.2.) (Page 204). The relay
setpoints ON and OFF are randomly varied inside a range so the material level does not
stop at the same point.
Example:
A range of 0.5 meters is used to vary the setpoint. The randomly-selected setpoints are
always inside the ON and OFF setpoints.
①
Random setpoint range
③
Level setpoint variation
②
Level setpoint ON
④
Level setpoint OFF