Parameter reference
8.6 Setup (2.)
HydroRanger 200 HMI
Operating Instructions, 06/2018, A5E36281317-AC
177
The fail-safe parameters ensure that the devices controlled by the main device default to an
appropriate state when a valid level reading is not available. The Primary Reading region on
the HMI will display dashes (– – – – ) until the fail-safe fault has been cleared.
For a list of faults that will cause fail-safe, see General fault codes (Page 282).
Note
When a Loss of Echo occurs,
Material Level (2.4.5.) (Page 178) determines the material
level to be reported when the fail
-safe timer expires. For more details, see Fail-safe mode
312).
Transducer selector (2.4.1.)
Sets the transducer index for all parameters applicable to this sub-menu.
The time for invalid measurements to elapse before a fail-safe state activates.
Response rate (2.3.4.) (Page 174)
Relay fail-safe (2.8.2.3.) (Page 201)
Once activated, the fail-safe state initiates the following:
1. The material level is reported based on Material level (2.4.5.) (Page 178)
– The unit responds to the new level as programmed (control and alarm relays activate
as defined by the programming).
– Individual relays can have independent fail-safe responses. See Relay fail-safe
(2.8.2.3.) (Page 201).
2. The appropriate error is displayed:
–
for loss of echo from the transducer.
–
for a shorted transducer cable.
–
for a cut transducer cable.
–
for all other problems.
When modifying the preset value, set it short enough to protect the process, but long enough
to avoid false alarms. Only use 0.0 minutes (no delay) for testing.
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