Page 38 SITRANS LU10 – INSTRUCTION MANUAL 7ML19985AN02
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Application Parameters
P129 RELAY FAILSAFE
Use this feature for relay failsafe operation independent from the Failsafe
Material Level (P070).
When accessed, the Relay Symbol is displayed in the Point Type field and the
Relay Number (corresponding to the LU SAM terminals) is displayed in the Point
Number field.
Select: "OFF" (preset) to have the relay respond to the Failsafe
Material Level (P701).
"HOLd" to hold the relay at the "last known" state until
normal operation resumes,
"dE" to have the relay de-energize immediately, or
"En" to have the relay energize immediately,
To select an independent Relay Failsafe option value:
1. Press
to display to the Auxiliary Function symbol,
2. Press or
to scroll access the failsafe options.
3. Press
with the desired option displayed.
values: "OFF"
"HOLd"
"dE"
"En"
P 116 BOUND ALARM HYSTERISIS
For ‘in bounds’ and ‘out of bounds’ Relay
Functions (P111 = 2 and 3 respectively), a
hysterisis or dead band prevents relay
chatter due to material level fluctuations
at the upper or lower setpoint.
Enter hysterisis in % of span or units of
P005. (Factory set at 2%).
The hysterisis value is applied above
and below the upper and lower bound
setpoints.
actual ’on’
P116, hysteresis
setpoint
P116, hysteresis
actual ’off’
e.g. in bounds, lower setpoint
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