KROHNE BM 90 EN - Manual (Page 20)

20
Pr. 29 Failsafe Time Delay (D=120)
Enter value (in seconds) before unit goes to selected fail-
safe positions.Minimum value is 30 seconds.
Pr. 23 Relay 1 Failsafe)
Pr. 24 Relay 2 Failsafe )
Pr. 25 Relay 3 Failsafe )
Pr. 26 Relay 4 Failsafe )
Pr. 27 Relay 5 Failsafe )
Note : Relay designated LOSS-OF-ECHO will always
de-energise.
Relay 5 Failsafe is not applicable in differential or OCM
mode.
Enter 1 Energise
2 De-energise
3 Hold-state
one option for each relay
Pr. 28 Analogue and Display Failsafe (D=3)
Enter 1 Low
2 High
3 Hold Value
Level/Differential Enter values in display unit as
selected Pr. 2.
Flow Enter values in unit selected at
Pr.46
Temperature Enter values in C
(only valid if probe fitted)
Sampler Enter value in hours
(no reset needed)
Totalizer Refer to Pr.49
Loss of Echo No set/Reset entries are required
or run/prog
Pr. 20 Relay 5 Designation - Basic Application - Relay Function
Pr. 21 Relay 5 Set
Pr. 22 Relay 5 Reset
Pr.23 to 27 Failsafe (D=3 for all)
On loss of power all relays will de-energise.
For other fault conditions e.g. damaged transducer, the
failsafe relay state (after time delay selected at Pr. 29) is
selectable.
(e) normally energised (d) normally de-energised
de-energised to alarm energise to start (motor)
Relay 5 Pr. 1 = 1 / Pr.1 = 2 Pr. 1 = 3 Pr. 1 = 4
Designation Level / Distance Differential Open Channel Flow
Enter 0 Off N / A Off
1 Level Alarm (e) N / A Level Alarm (e)
2 Level Control (d) N / A Level Control (d)
3 Off N / A Flow Alarm (e)
4 Off N / A Off
5 Off N /A Totalizer Drive (d)
6 Temperature Alarm (e) N / A Temp. Alarm (e)
7 Loss of Echo (e) N / A Loss of Echo (e)
8 Run / Prog (e) N / A Run / Prog (e)