EBARA 1GP Manuel D'utilisation Et D'entretien page 27

System Isolating valves or
design stop valves partially
pressure not closed or obstructed
reached
Excessive
and/or
pressure loss
Presence of air in
the intake
The
pumps rotate in the
inverse direction
Pressure
not
correctly (if present)
Triggering
minimum
switch (if
due to a low level or
lack of liquid in the
intake manifold
Triggering
float switches.
11.4. CALIBRATING THE PRESSURE SWITCHES
The pressure switches are only present in sets with an EP, SP-
EFC or SP-MFC control panel.
The pressure switches are calibrated (at ambient temperature)
according to the following standard table:
Pressure switch calibration table:
Pump Type of
sequence operation
Pump no. 1
Stop
(or pilot pump)
Pressure switch
Start
no. 1
Pump no. 2
Stop
Pressure switch
no. 2
Start
Pump no. 3
Stop
Pressure switch
no. 3
Start
Pump no. 4
Stop
Pressure switch
no. 4
Start
With:
P0 = max pressure in bar of pump no. 1 (or pilot pump) with
the opening closed
P1 - P8 = calibrating pressures in bar (see the following table)
ΔP = minimum differential in bar (see the following table)
Open or check the
valves
intake Reduce the pressure
delivery losses
Check for clogging in
the pipes
Check the flanged or
threaded
connections and the
gaskets for any liquid
leaks
infiltrations, install air
bleed valves on the
delivery
necessary
three-phase Invert
phases on the panel
switches Recalibrate
calibrated pressure switches or
replace them
of the Check the
pressure upstream
present) intake manifold
check for
Restore
level
of the Check or restore the
level in the tanks and
correctly adjust the
floats
Calibrating
pressures
[bar]
P1=P0-10%
P2=P1-Pmin
P3=P1-0.5
P4=P3-Pmin
P5=P3-0.5
P6=P5-Pmin
P7=P5-0.5
P8=P7-Pmin
NB: depending on the characteristics of certain types of pumps
(with flat curve), the pressure switch for pump no.1 (or pilot)
may be calibrated at a stopping pressure P1= P0 – 0.3 bar Any
diaphragm tanks must be calibrated by the user at a pressure
0.3-0.5 bar lower than the starting pressure of the pressure
switch of the last pump (minimum pressure).
Regulating range:
PRESSURE
SWITCH TYPE
or air
PY06
line if
PY12
XMP A06
the two
XMP A12
XMX A25
FSG 2NE – 9NE
the
FYG 22NE
Note: check directly on the installed pressure switches for the
valves
identification code of the assembled model.
of the
or
Adjustment procedure (see image fig. H):
leaks.
the liquid
 completely loosen the regulating nut or screw "B" of
pressure switch 1 of pump no. 1 (in this you have the
minimum differential ∆P)
 start pump no. 1 by means of the manual control (or the
pilot pump when the set is provided with one);
 slowly close the isolating valve downstream of the set
until obtaining the desired stop pressure (reading on the
pressure gauge), adjust pressure switch no. 1 by rotating
the nut or screw "A" until the contact clicks open, this
operation will stop the pump;
 slowly open the isolating valve downstream of the set,
which causes a loss of system pressure until the contact
clicks shut for pressure switch no. 1(which is already set
with minimum  P), this operation will start the pump.
Check the adjustment by increasing and decreasing the
Sets
pressure downstream of the system, always using the
isolating valve;
 perform the same operations for the set's remaining
Sets with 1
pressure switches. To adjust the start and stop of the
pump
pumps, use the information provided above in the
"Pressure switch calibration table". Pay particular
attention to set the starting values for the pumps following
Sets with 2
the first one, with decreasing pressure values to prevent
pumps
the simultaneous start of the pumps;
 discharge the downstream pressure, set automatic
operation on the control panel, slowly open the isolating
Sets with 3
valve downstream of the set, check the sequential
pumps
intervention calibration of the pumps at least twice to
further check the inversion of the starting order of the
Sets with 4
pumps.
pumps
ENGLISH
MINIMUM
PUMP P DIFFERENTI
STOP AL
P
PRESSURE
[bar]
[bar]
1.5 - 4.5 0.8 - 1.2
4.5 - 10.3 1.2 - 2.1
1 - 6 0.8 - 1.2
1.3 - 12 1 - 1.7
3.5 - 25 3.4 - 4.5
1.4 - 4.6 1 - 1.2
2.8 - 7 1.2 - 1.6
MAXIMUM
DIFFERENTI
AL P
2
[bar]
-
-
0.8 - 4.2
1 - 8.4
3.4 - 20
1.2 - 2.3
2.3 - 2.7
8