P071 failsafe material level – Siemens sitrans LU01 User Manual
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SITRANS LU01 – INSTRUCTION MANUAL
7ML19985BE02
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If the timer expires (before a valid measurement is made), the SITRANS LU01 advances to
the Failsafe Material Level (P071) as restricted by Failsafe Advance (P072).
When a valid measurement is made after the timer expires, the SITRANS LU01 advances
to the new material level (if changed), as restricted by Failsafe Advance (P072) and the
timer resets.
If the timer expires due to a measurement difficulty, LOE flashes in the Reading display.
Once activated, the Failsafe State initiates the following:
1.
The material level is reported based on P071 Failsafe Material Level.
• The unit responds to the new level as programmed (control and alarm relays
activate as defined by the programming).
• Individual relays can have independent failsafe responses. See
P129 Relay
Failsafe.
2.
The appropriate error is displayed:
• LOE for loss of echo from the transducer
• Short for a shorted transducer cable
• Open for a cut transducer cable or a defective transducer
• Error for all other problems including reversed Ultrasonic/Temperature
transducer terminal connections or wrong Transducer (P004) entered.
When modifying the preset value, set it short enough to protect the process but long
enough to avoid false alarms. Only use No Delay (0.0 Minutes) for testing.
P071 Failsafe Material Level
The material level reported when a Failsafe State is initiated.
Select the Failsafe Material Level based upon the relay operation required during failsafe
operation.
Selecting HI, LO, or HOLd
1.
Press FUNCTION
to display the Auxiliary Function symbol.
2.
Press ARROWS
to scroll to the desired option.
3.
Press ENTER
to set the value.
Values
Range: -999 to
9999
Value in units or % (-50% to 150% of span)
HI
Level goes to maximum span
LO
Level goes to 0 span (Empty)
HOLd
*
Level remains at last reading
Related
•
P001 Operation
•
P006 Empty
•
P007 Span
•
P111 Relay Control Function
•
P112 Relay ON Setpoint
•
P113 relay OFF Setpoint
•
P129 Relay Failsafe