Un D E R- L O A D An D O V E R- L Oa D F U N Ct Io N S; L Evel Al A Rm A N D 1: 1 S Ig N Al In P U T - ETATRON D.S. eOne MA Notice D'installation, Emploi Et Entretien

f) UNDER-LOAD (see section), the pump stop dosing and the red LED lights up;
g) OVER-LOAD (see section), the pump stop dosing and the red LED lights up;
UNDER-LOAD and OVER-LO AD functions
The innovative HRS technology has allowed to create a range of metering pumps capable of detecting pressure
changes within the plant or malfunctions associated with these changes. The pump is able to provide you with useful
information about the status operation. This is possible through two types of signals.
a) UNDER-LOAD: where, in normal operation, the pump is missing the fluid, in addition to the normal lack of additive in
the tank, could be caused by problems on the suction line: filter clogged or damaged valves, the pump is placed in a state of
UNDER LOAD . This condition is indicated by the LED red lights up (7) and the pump stops after about 10 injections.
b) OVER-LOAD: The pump, during normal operation, performs a real-time control on the pressure conditions inside the
plant to be treated. If this pressure exceeds the maximum allowed (factory default), the pc-board of the pump reacts lighting
up the red LED (7) and stop the dosing after about 10 injections. 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 OVER-LOAD and UNDER-LOAD functions can be enabled and disabled by pressing and holding (for about 5
seconds) the 20/100% button (3). A triple blink of the red LED (7) indicates that the function has been enable, while a triple
blink of the same LED with green color (7) indicates that the function has been disabled. During this steps the pump stop
dosing and start after the function has been enbled/disabled.OVERLOAD and UNDERLOAD functions are disable by
factory default.
Level alarm and 1:1 signal input
The pump is supplied with a connector for a level switch (supplied on request). When the height of the liquid in the
product tank is lower than a predetermined minimum level, the level sensor alerts the user and stops the dosage after five
seconds. The delay in stopping the metering pump is used to prevent any disturbance of the liquid level
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Fig. 9 – Level probe and water meter connections