Siemens sitrans LU01 - Manual (Page 52)

Page 46 SITRANS LU01 – INSTRUCTION MANUAL 7ML19985BE02
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For IN-BOUNDS and OUT-OF-BOUNDS Relay Functions (P111 = 2 and 3 respectively), a
dead band prevents relay chatter due to material level fluctuations at both the upper and
lower setpoints.
Independent Relay Failsafe (P129)
P129 Relay Failsafe
Sets the failsafe operation per relay to allow for more flexible programming.
Use this for operations independent of the Failsafe Material Level (P070).
Relay Failsafe is only available for the following relay functions (P111) and is not used for
any other relay control function.
To select an independent Relay Failsafe value:
1. Press FUNCTION to display the Auxiliary Function symbol.
2. Press ARROWS to scroll through the failsafe options.
3. Select option and press ENTER .
Enter the dead band in either percent of
span or units of measure (P005). The
deadband value is applied both above
and below the upper and lower bound
setpoints as shown in the figure.
Primary Index Relay
Values
OFF * Response governed by P071 Failsafe Material Level
HOLd For LAST KNOWN relay state retention
dE To have the relay de-energize immediately on failsafe
En To have the relay energize immediately on failsafe
Altered by • P071 Failsafe Material Level
Related
• P070 Failsafe Timer
• P111 Relay Control Function
Relay Function (P111) Preset (P129)
1 – level alarm
OFF
2 – in bounds alarm
3 – out of bounds alarm
4 – rate of change alarm
5 – temperature alarm
50 – all pump controls
dE
Actual ON or OFF setpoint
Actual OFF or ON setpoint
P116, deadband
P116, deadband
Setpoint set in P112 or P113