EBARA Ego Operating And Maintenance Manual page 16

a) "Proportional differential pressure" (∆pv – regulated mode): in this
mode the button pulsates and the duration of the pulse interval shortens
along with the flow decreasing.
b) "Fixed speed" (unregulated mode): in this mode the setting button does
not pulse, but remains constantly illuminated.
• Each mode enables a choice between three different preset curves at
"proportional differential pressure" and three curves at "fixed speed". The
button lights up with the colour that indicates the selected level. The sequence
is "blue-green-yellow": the blue indicates the lowest speed/differential pressure
curve, the yellow the maximum speed/differential pressure curve
GB How to set different operating curves and how to switch between the 2 modes
• If the pump is operating at proportional differential pressure (regulated mode
– recognizable by the pulsating button), a short pressing of the button will
change the operating curve according to a.m. sequence (blue-green-yellow).
• In order to switch from the "regulated mode" to the "fixed speed" (unregulated
mode) it is necessary to press the setting button for at least 5 seconds: in
this way the button will remain constantly lit (thus indicating the fixed speed
mode has been set) and the current speed curve set will be according to the
colour selected before long pressing the button. Shortly pressing the setting
button will set the pump back to "proportional differential pressure" mode.
In order to change the speed curve (in "fixed speed" operation) it is therefore
necessary to select the requested curve while in "regulated mode" and after
that to switch to the "fixed speed mode" by long pressing the setting button.
NOTE: the hydraulic response in the regulated mode is proportionate to the
flow. The set head for single chosen level has an inclination angle of 50% (see
table below).
10.2 PUMPS Ego ER-/40, 60, 80 – CONTROL BY ANALOG SIGNAL
The Ego ER -/40, 60, 80 are equipped with an additional module that allows
controlling the pump with an analogue signal 0 -10 V.
"Unregulated mode" (fixed speed)
• The curve is determined by the value of the controlling signal. This mode is
set by pressing and holding the button on the primary circuit for 5 seconds
(the light is on). If the value of the controlling signal is lower than 1 V, the pump
enters in a stand-by mode. See diagram at the end of this manual.
"Regolated mode" (proportional differential pressure)
• The pressure curve of the pump is determined by the value of the controlling
signal. If the value of the controlling signal is lower than 1 V, the pump enters
in a stand-by mode. See diagram at the end of this manual.
External control works only if the input resistance is < 10kΩ. In this case, the
input voltage must be considered. If the input resistance is > 50 kΩ, the pump
will operate as a standard version without external control.
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