FAILSAFE PARAMETERS (P070 to P072)
As preset, if Failsafe Operation is activated, the display, alarm relays, and the mA
output are held at their last "known" values, and control relays de-energize, until a
valid measurement is regained.
To automatically operate alarms / controls under these conditions, alter the following
parameters as required.
FAILSAFE OPERATION
If Failsafe Operation is not required, proceed to RELAY PARAMETERS.
If a difficulty occurs, the display, relay status, and mA outputs are held at their last
"known" values and the Failsafe Timer is activated.
When a valid measurement is made before the Failsafe Timer (P070) expires, the
HYDRO+ advances to the "new" material level, per the Max Empty / Fill Rate (P700 /
P701, preset by Measurement Response, P003), and the timer resets.
If the timer expires, the HYDRO+ advances to the Failsafe Material Level (P071), per
Failsafe Advance (P072), operating relays per Relay Failsafe (P129) and the mA
output per mA Failsafe (P219).
When a valid measurement is made after the timer expires, the HYDRO+ advances to
the "new" material level, per Failsafe Advance, and the timer resets.
If Failsafe Operation is activated frequently, see TROUBLESHOOTING .
P070 FAILSAFE TIMER
Enter the time to elapse (in minutes), upon a measurement or
technical difficulty, before failsafe operation is activated.
If the timer expires due to a measurement difficulty, "LOE" flashes
in the Reading display.
Technical difficulty messages ("Short", "OPEn", and/or "Error") flash in
the Reading display before the timer expires. The offending terminal
connections are displayed in the Auxiliary Reading display.
Use a short duration Failsafe Timer value when fast
moving surfaces are monitored, however avoid entering
a value so short as to cause nuisance activation.
This value is automatically altered when Measurement Response (P003)
is altered. See TECHNICAL REFERENCE Measurement Response.
values: 0.000 to 9999
TROUBLESHOOTING
TECHNICAL REFERENCE
PARAMETERS
PL-507 69
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