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9.2.4
Fail-Safe (2.4.)
The fail-safe parameters ensure that the devices controlled by the SITRANS LUT400 default to
an appropriate state when a valid level reading is not available. The PV region on LUI will
display dashes (– – – – – – –) until the fail-safe fault has been cleared. (See General Fault
Codes (Page 273) for a list of faults that will cause failsafe.)
Note
When a Loss of Echo occurs Material Level (2.4.1.) (Page 179) determines the material level
to be reported when the Fail-safe timer expires. See Loss of Echo (LOE) (Page 302) for more
detail.
9.2.4.1
Material Level (2.4.1.)
Note
The default is a factory setting and depends whether or not your device was ordered as
NAMUR NE43-compliant for Fail-safe.
Defines the mA output to use (shown in Current Output Value (2.5.8.) (Page 183)) when the
Failsafe Timer expires and the device is still in an error condition.
Options
Default
9.2.4.2
LOE Timer (2.4.2.)
Sets the time to elapse since the last valid reading, before the Fail-safe Material Level is
reported (defined in seconds).
Values
9.2.4.3
Fail-Safe mA Value (2.4.3.)
Note
Material Level (2.4.1.) (Page 179) must be set to Value for the Material Level (2.4.1.)
(Page 179) value to be reported.
SITRANS LUT400
Operating Instructions, 04/2021, A5E33329501-AG
HI
20.0 mA (max. mA Limit)
LO
4.0 mA (min. mA Limit)
HOLD
Last valid reading
VALUE
User-selected value [defined in Fail-Safe mA Value (2.4.3.)
(Page 179): default 3.58 mA]
VALUE (if ordered with NAMUR NE43 compliant fail-safe preset)
HOLD (if ordered without NAMUR NE43 compliant fail-safe preset)
Parameter reference (LUI)
Range: 0 to 7200
Default: 100
9.2 Setup (2.)
179
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Troubleshooting
