Endress+Hauser RIA452 Betriebsanleitung Seite 114

Commissioning
In event 5, the alarm relay and the error message on the display are acknowledged by pressing
the jog shuttle.
In event 6 and 7, the unproblematic operation of the system is indicated.
b) Operation monitoring
In the operation monitoring mode, a change in the status signal is expected at the related digital
input once a pump has been triggered. A waiting time (Sampl. Time, T) is defined for this. The
alternating system is activated. If no signal change is experienced during the specified time, the
pump is regarded as faulty.
In event 1, the unproblematic operation of pump 1 is illustrated. Pump 1 is activated following
triggering due to limit value violation. The status signal changing within T at DI1 signals an
unproblematic pump. The pumping sequence continues with pump 1.
In event 2, no checkback signal follows at DI1 once pump 1 has been activated. Thus, this pump
is regarded as faulty. The alarm relay is activated and an error message is output on the display.
The pumping action is assumed by pump 2, event 3. This pump reports back to DI2 within the
defined waiting time. Pumping continues until the limit value violation is undershot.
In event 4, a new limit value violation occurs. Due to the alternating system, another attempt is
made to start pump 1. Since again no checkback signal is returned by the time the waiting time
has elapsed, pump 2 (event 5) takes over operation. If the alarm relay and error message were
not already active on the display, they would be now.
In event 6, the level is exceeded again and a pump is activated. Following the alternating system,
pump 1 is tried again. This time, pump 1 returns a checkback signal. The alarm relay is reset.
In event 7, the error message on the display is acknowledged. The status signal at the DI does
not have any effect on error message acknowledgment on the display.
114
RIA452
G09-RIA452ZZ-16-10-xx-en-007
Endress+Hauser