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Example: Setting a High Flowrate Alarm
To assign Relay 3 to a high flowrate alarm that activates when the flowrate rises above 10 l/s:
1. Enable the High Flowrate Alarm (set Enable (2.8.9.1.) (Page 208) = Enabled).
2. Set High Flowrate Value ON (2.8.9.2.) (Page 208) = 10
3. Set High Flowrate Value OFF (2.8.9.3.) (Page 208) = 8
4. Set Assigned Relay (2.8.9.4.) (Page 209) to Relay 3
Example: Setting a Low Flowrate
Alarm To assign Relay 3 to a low level alarm that activates when the flowrate falls below 2 l/s:
1. Enable the Low Flowrate Alarm (set Enable (2.8.10.1.) (Page 209) = Enabled)
2. Set Low Flowrate Value ON (2.8.10.2.) (Page 209) = 2
3. Set Low Flowrate Value OFF (2.8.10.3.) (Page 209) = 4
4. Set Assigned Relay (2.8.10.4.) (Page 210) to Relay 3
7.7
Pump Control
The SITRANS LUT400 has the pump control functionality to solve nearly any water/waste
water application. To set up pump control for simple applications, see Pump Control Wizard
in LUT400 Communications manual
Communications for SITRANS LUT400 (HART) Manual (7ML19985NE01)
1)
7.7.1
Pump Control options
Methods of pump control are dependent on two variables:
Pump start method indicates in what sequence pumps are started; using Fixed, Alternate, or
Service Ratio setpoints.
Pump duty indicates whether new pumps start and run with any currently running pumps
(most common) or whether new pumps start and shut off currently running pumps; using
Assist or Backup duty.
7.7.1.1
Pump Control algorithms
Algorithms are used to provide six modes of pump control. They can be used to start multiple
pumps (assist) or one pump at a time (backup). These six modes can be grouped into three
main methods of pump control used by the SITRANS LUT400: Fixed, Alternate, and Service
Ratio. The LUT420 (Level) model operates with Alternate pump control only.
SITRANS LUT400
Operating Instructions, 04/2021, A5E33329501-AG
.
1
General Operation
7.7 Pump Control
103
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Troubleshooting
