Endress+Hauser RIA452 Mode D'emploi page 113

RIA452
Pump monitoring function
If pump monitoring should be implemented, digital inputs 1 to 4 are permanently assigned to
relays 1 to 4. This function is enabled for the corresponding digital input with the Function
parameter. Pump must be selected here.
In general, two different types of monitoring can be implemented. With fault monitoring, the
signal at the digital input is changed if there is a fault at the pump.
With operation monitoring, the correct startup and operation of the pump is reported to the
process display unit by means of a signal change at the digital input.
The Sampl. Time setting is used to choose between these operating modes.
Setting
• Sampl. Time = 0 -> fault monitoring
• Sampl. Time <> 0 -> operation monitoring
a) Fault monitoring operating mode
In the fault monitoring operating mode, the status signal signals the availability of the pump. If
a fault occurs, the status signal changes accordingly.
Fig. 14: Fault monitoring operating mode
In event 1, pump 1 is activated as a result of signal limit value violation. Pump 1 is active until
the level has dropped an appropriate amount.
In event 2, a fault occurs at pump 1 during operation. The status signal at DI1 changes. As a
result, pump 2 and the alarm relay are activated (if configured accordingly) and a message
indicating the pump malfunction is shown on the display.
In event 3, the level has dropped to the extent that the system no longer has to pump and pump
2 stops operating.
The fault at pump 1 was rectified, the status signal at DI1 changes again. The alarm relay is reset,
see event 4.
Endress+Hauser
Commissioning
G09-RIA452ZZ-16-10-xx-en-006
113