FAILSAFE OPERATION GENERAL
As preset, upon a loss of echo, the HYDRO+ Reading, alarm relays, and mA output
are held at last "known" values and pump/control relays are de-energized, until a valid
measurement is regained.
If desired, program the HYDRO+ to provide alternative display, relay and/or mA
output operation under loss of echo conditions to provide failsafe operation.
PROGRAMMING
1. Enter the
Failsafe Material Level
(where alarms warn "unsafe" operation).
P071: HI = 100% bar graph level
LO = 0% bar graph level and or to access.
HOLd = last level (preset)
specific level = -50% to 150% of Span (P007) in Units or %.
2. Enter the Measurement Response for advance to the Failsafe Material Level.
P003 Response: 1 = 100 minute delay, advance at 0.1 metres/minute
2 = 10 minute delay, advance at 1 metre/minute
3 = 1 minute delay, advance at 10 metres/minute
3. To test failsafe operation (with the monitored surface still), disconnect the
transducer cable and ensure alarms/controls activate.
For more failsafe programming and operation information,
see PARAMETERS P003,P070,P071,P072,P129,P219,P700,P701.
If any of these parameters are altered, retest Failsafe Operation.
PARAMETERS
PL-507 58
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