KROHNE BM 90 EN - Manual (Page 29)

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4.3. Pump control (Pr.1 = 1)
The application :
l 2 pump control, pump down in a wet-well, duty-assist operation
l Alternate pump duty to reduce wear
l 4-20 mA to remote indicator
l Loss-of-Echo indication to telemetry
l Display actual level in meters
Pr. 1 = 1 Defines level measurement.
Pr. 2 = 2 Programme in meters, display in meters.
Pr. 3 = 5.4 Transducer to zero level = 5.4 m.
Pr. 4 = 4.5 The span over which measurement is required.
Pr. 5 = 0.5 Blanking into which the material will not rise.
Pr. 6 = 1.5 Max. rate of level change 1.5 m/min.
Pr. 8 = 2 Relay 1 control on level (normally de-energised).
Pr. 9 = 3.75 Relay 1 energises at 3.75 m to turn pump 1 on.
Pr.10 = 0.5 Relay 1 de-energises at 0.5 m to turn pump 1 off.
Pr.11 = 2 Relay 2 to control on level (normally de-energised).
Pr.12 = 4.0 Relay 2 energises at 4.00 m to turn pump 2 on.
Pr.13 = 0.75 Relay 2 de-energises at 0.75 m to turn pump 2 off.
Pr.17 = 7 Relay 4 assigned to indicate loss-of-echo to the telemetry system.
Pr.23 = 2 Switch pump 1 off on failsafe.
Pr.24 = 2 Switch pump 2 off on failsafe.
Pr.28 = 1 Analogue output to 4 mA on failsafe.
Pr.29 = 30 Failsafe delay 30 secs.
Pr.30 = 2 Analogue output to be 4-20 mA fixed to Pr.4.
Pr.51 = 2 Alternate pump duty.
Pr.78 = Simulate the program.
0.5 (Pr.10)
5.4m
(Pr.3)
0.5m (Pr.5)
4.5m
(Pr.4)
Stop 1
Start 1
3.75 (Pr.9)
4.00 (Pr.12)
Start 2
Stop 2
0.75 (Pr.13)