Alarms; Level Alarm; Flow Switch Alarm; Meter Impulses Alarm (Only Proportional Versions) - ETATRON D.S. eOne PLUS Notice D'installation, Mode D'emploi, Notice D'entretien

ALARMS

The PLUS Metering pump has the ability to monitor the proper functioning of the system and signal some alarm
situations that may occur. It can specifically detect the following alarms:
All alarm conditions are indicated by the lighting of the LED on the control panel and on the display. The switching
of the alarm relay also occurs (contacts 19, 20 and 21 fig.9) if enabled, where applicable, by the different configuration
menus. Relay switching occurs in all situations where enabling doesn't occur.

Level alarm

The floating level sensor signals when the liquid to be dosed into the tank is finished. The pump will stop, indicating
the alarm status. Connect the level sensor to the pump terminal box (see fig. 9), in correspondence to terminals 5 and 6,
and introduce it into the tank containing the additive to be dosed. In order to prevent false alarms due to fluctuations in
the liquid level itself the alarm occurs with a delay of at least 3 sec.

Flow switch alarm

The electronic circuit of the pump, registers every blow given by the electromagnet, which is matched by an injection
of product from the pump body. In some cases the injection may not occur as a result of wear of pump body parts, the
valves, the O-rings, the presence of air, etc.
In the pumps equipped with a flow switch (hydraulic device which shows the actual passage of fluid) if the missed
injections occur within the sampling interval exceed the set parameters, the flow switch alarm triggers and the injections
stop. The parameters to set are the following:
REFERENCE IMPULSES
MAX DIFFERENCE
To better explain this function, consider for example, a sampling interval set to 100 impulses and a maximum
allowable difference of 10 pulses. The circuit memorises the impulses of the electromagnet and in correspondence to
each of these it expects a corresponding closing of the contact of the flow switch connected to the hydraulic delivery of
the pump. If the closures recorded are greater than or equal to 90 (100-10 = 90), the pump is operating normally and
repeats the next sampling cycle. If, however, the closures recorded are less than 90 the pump goes into alarm mode
signalling the situation in the manner indicated above.
Within the programming menu you can choose whether or NOT to STOP the metering in the case of an alarm.

Meter impulses alarm (only proportional versions)

The impulse meter alarm activates in the multiplicative operation modes, namely: 1 x N (m), PPM e ml x m
This alarm is activated when the number of pulses generated by the meter is such as to require the pump to run at a
higher frequency than the maximum. This event may be generated by an incorrect programming or an incorrect choice of
the meter or by the metering pump in relation to the plant to be treated. The user in the programming menu can choose
whether to enable this type of alarm. It is recommended however to enable it to provide a greater guarantee of correct
metering and sizing check. It is also possible to choose, always within the programming menu, whether or NOT to STOP
the metering in the case of an alarm.
The alarm activates when the number of injections memorised and not dispensed exceeds the value 4 * N where N
is the number of injections to be given for each meter impulse. On the pump display the number of injections to be yet
delivered is shown in dynamic mode. The choice of factor 4 is an easy way to prevent any transient phenomena
generating false alarms.
If the activation of this alarm is frequent it is recommended that the operator checks the operating
conditions of the plant.
Level alarm
•
Flow switch alarm
•
Meter impulse alarm that intervenes in the 1xN (M) function - only proportional versions
•
Meter impulse alarm in PPM - only proportional versions
•
Meter impulse alarm in ml X m
•
Maximum value alarm - only control versions
•
Minimum value alarm - only control versions
•
Overdose alarm - only control alarms
•
OVERLOAD alarm
•
UNDERLOAD alarm
•
- only proportional versions
3
Number of impulses that the circuit samples
Maximum number of pulses permissible within the sampling
interval, that cannot be effectively provided
.
3
ENGLISH
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