en
– Original Instructions
33
balance the work load between the two pumps.
PAr
= Parallel: both pumps operate at the same time with the
same setpoint. The Master pump determines the behaviour of
the system and is capable of optimising performance by ordering
the start and the stop of the Follower pump based on the
pressure and the flow, to ensure that the setpoint is kept, whilst
at the same time minimizing power consumption
FPA
= Forced parallel: the pumps always operate at the same
time and with the same setpoint
In all configurations, when the communication between the two
heads is lost, both start operating as if they were single pumps (P38 =
SnG
)
Default:
ALt
6.5.5 Sensor Configuration Parameters
No. Parameter
Unit of
measurement
Description
P40 Sensor selection [
NOS
,
d2
,
d1
,
ISP
,
USP
]
Analog input configuration setup:
NOS
= no configuration
d2
= two pressure sensors (discharge/suction)
d1
= 4÷20 mA differential sensor
ISP
= 4÷20 mA input as speed reference (see
paragraph 6.6.1)
ISP
= 0÷10 V input as speed reference (see
paragraph 6.6.1)
Default:
NOS
P41 Pressure Sensor Unit Of Measure
[BAR, PSI]
This parameter sets the unit of measure
(
BAr
,
PSI
)
for the pressure sensor. It affects the head view LED
parameter (see Par. 6.3.4).
Default: bar.
P42 Full scale value for pressure
Sensor 1 4÷20mA [0.0÷25.0BAR] /
[0.0÷363PSI]
bar/psi
Setting of the full scale value of the 4÷20mA pressure
sensor 1 connected to analog inputs 9 and 10 for the
single-phase version, and inputs 17 and 18 for the
three-phase version.
Default: depending on the type of pump.
P43 Pressure sensor 2 full scale value
[0.0÷25.0BAR]/[0.0÷363PSI]
bar/psi
Setting of the full scale value of pressure sensor 2
connected to analog inputs 7 and 8 for the single-phase
version, and 15 and 16 for the three-phase version.
Default: depending on the type of pump.
P44 Zero Pressure Auto-Calibration
bar/psi
This parameter lets the user perform the initial auto-
calibration of the pressure sensor.
It is used to compensate for the offset signal of the
sensor at zero pressure caused by the tolerance of the
sensor itself.
Procedure:
1.
Access P44 when the hydraulic system is at a 0
pressure, without liquid inside, or with the pressure
sensor disconnected from the piping: the actual
pressure value of 0 is displayed.
2.
Start the auto-calibration by pressing
or
(see Par. 6.2).
3.
At the end of the auto-calibration, the 0 (zero)
pressure is displayed, or the “---“ (---) message, if
