Failsafe Parameters (P070 To P072) - Siemens interranger DPS300 Instructional Manual

Failsafe Parameters (P070 to P072)

As preset, in the event of a measurement or technical difficulty, the DPS300 holds
the Reading, Bar Graph, mA outputs, and relays at their last "known" values.
To operate process control equipment under these conditions, alter the following
parameters as required.
Note:
If alternate Failsafe Operation is not required, proceed to RELAY PARAMETERS.
P070 Failsafe Timer
Enter the time to elapse (in minutes), upon a difficulty, before failsafe operation is
activated.
In the RUN mode, when a difficulty first occurs, the Reading, Bar Graph, relay
status, and mA outputs are held at "last known" values and the Failsafe Timer is
activated.
When a valid measurement is made before the timer expires, the DPS300
advances to the "new" material level (if changed) and the timer resets.
If the timer expires (before a valid measurement is made), the DPS300 advances
to the Failsafe Material Level (P071) as restricted by Failsafe Advance (P072).
When a valid measurement is made after the timer expires, the DPS300 advances
to the "new" sludge 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.
Technical difficulty messages flash in the Reading display before the timer
expires. The offending terminal connections are displayed in the Auxiliary Reading
display.
DISPLAY
"LOE"
"Short"
"OPEn"
"Error"
Note:
While a short duration Failsafe Timer value may be required (when process
control equipment is used) avoid entering a value so short as to cause nuisance
activation.
Values:
InterRanger DPS300
CAUSE
weak echo (see TROUBLESHOOTING GUIDE).
short circuited transducer cable, or defective transducer
open circuited transducer cable, or Point Number is scanned but
a transducer is not connected, or defective transducer
reversed Ultrasonic/Temperature transducer terminal connections
or wrong Transducer (P004) entered.
0.000 to 9999
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