Siemens LU01 Manuel D’Utilisation

7ML19985BE02

SITRANS LU01 – INSTRUCTION MANUAL

Page 43

To reset the Relay Function to use Standard Alarms, enter the desired Relay Set Up 
(P100).

Relay ON and OFF Setpoint values set the critical points (based on the Relay Function) 
where, in RUN mode: 

•

Relay status indicators are switched ON and OFF 

•

Alarm Indicators (if programmed) are switched ON or OFF 

•

Relays  are 

energized

 and 

de-energized

 

For most Relay Functions, setpoint values represent material levels, entered in Units 
(P005) or percent of Span (P007) as referenced to Empty (P006). Temperature alarm 
values are entered in degrees Celsius (°C). 

Rate alarms are entered in Units / minute or percent of Span per minute. A positive value 
is entered for a filling rate alarm; negative for emptying.

1.

When reading and setting this parameter through Modbus or SmartLinx 
communications the parameter values are mapped to different numbers. 
See the relevant SmartLinx manual for Modbus information.

Off

0 Relay set off, no action (preset)

Level

1* Based on level setpoints ON and OFF

In Bounds

2

When level enters the range between ON and OFF 
setpoints

Out of Bounds

3

When level exits the range between ON and OFF set-
points 

Rate of Change

4 Based on rate setpoints ON and OFF

Temperature

5 Based on temperature setpoints ON and OFF 

Loss of Echo (LOE)

6 When echo is lost

Cable Fault

7 When the circuit to a transducer is opened

Fixed Duty Assist

50

At fixed ON and OFF setpoints and allows multiple 
pumps to run or for rake control