Under-Load And Ove R-Load Alarms; Relay Services Output - ETATRON D.S. eOne MF Notice D'installation, Emploi Et Entretien

If the activation of this alarm is frequent it is recommended that the operator checks the operating conditions
of the plant.

UNDER-LOAD and OVE R-LOAD alarms

The innovative HRS technology has enabled the development of a range of metering pumps that have the
ability to detect any changes in pressure inside the plant or malfunctions related to these variations. The pump is
able to provide useful information about the state of operation. Specifically, this is expressed in the availability of
two different types of signals.
a) UNDERLOAD: If during normal operation the pump has no fluid to be metered which may be caused by
problems on the suction line: clogged filter or damaged valves, the pump goes into UNDERLOAD status. This
condition is indicated by the signal on the display, the ALARM LED lights up and activates the corresponding
relay (if enabled). The pump stops after approximately 20 injections.
b) OVERLOAD: The pump during normal operation performs a check (in real time) on the pressure
conditions in the plant. If this pressure exceeds the maximum allowed (plate setting), the instrumentation of the
pump reacts reporting this state with a message on the display, the ALARM LED lights up and the relay activates.
Even in this case, the stopping of the pump occurs after 20 injections from the occurrence of the event. Under
particular conditions of pressure could occur the OVER-LOAD alarm even with air presence in the pump body. We
recommend that you take action to check the pump.
The UNDER-LOAD and OVER-LOAD functions can be enabled and disabled using the respective setup
menu. The factory settings for the UNDER LOAD and OVER LOAD functions are disabled .

Relay services output

Within each alarm sub-menu an alarm relay can be enabled, and the choice of switching mode from NO to
NC and vice versa, in the following cases:

Level alarm

Flow switch alarm

Meter impulse alarm that intervenes in the 1xN (M) function

Meter impulse alarm in PPM

Meter impulse alarm in ml x m3
Instead, in the following alarm situations the relay always switches:

UNDERLOAD alarm

OVERLOAD alarm
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