Xylem LOWARA e-SVE Installation, Operation And Maintenance Manual page 37

For the characteristics of MSE:
 It is necessary the adoption (on the hydraulic plant) of an absolute pressure sensor for each
 Maximum 3 pumps, all of the same type and power, can be connected by mean of the Multi-
 The pumps are managed serially, meaning that only the last activated pump modulates its
 (MSY) Hydrovar
For the characteristics of MSY:
 It is necessary the adoption (on the hydraulic plant) of an absolute pressure sensor for each
 Maximum 3 pumps, all of the same type and power, can be connected by mean of the Multi-
 All the pumps are synchronized, meaning that all pumps in the system maintain the set
P26. Max RPM set [ACt set÷Max
This parameter (default value depends on the hydraulic) sets the maximum speed of the pump,
expressed in [RPM x 10]. Maximum speed is model dependant.
P27. Min RPM set [Min÷ACt set
This parameter (default value depends on the hydraulic) sets the minimum speed of the pump,
expressed in [RPM x 10]. Minimum speed is model dependant.
P28. Ramp 1 [1÷250]
This parameter (default value 3) adjusts the fast acceleration time expressed in [seconds], and it
affects the control of the pump for HCS, MSE and MSY control modes.
P29. Ramp 2 [1÷250]
This parameter (default value 3) adjusts the fast deceleration time expressed in [seconds], and it
affects the control of the pump for HCS, MSE and MSY control modes.
P30. Ramp 3 [1÷999]
This parameter (default value 35) adjusts the slow acceleration time expressed in [seconds], thus
determining:
 the regulation speed of the internal Hydrovar
 the constant outgoing pressure.
The ramp depends on the system which has to be controlled, and affects the control of the pump
for HCS, MSE and MSY control modes.
*
It depends on the hydraulic
demand: typical is the use of the Hydrovar
P26 to P37 (see par. 7.5.3).
pump, which gives to the set of drives the feedback pressure signal (by mean of External
Pressure Sensor input [9,10] par. 5.5, configured by P40): MSE will always try to minimize the
error between the pressure set-point and the feedback pressure signal.
pump Protocol.
speed for maintaining the set pressure, while all the other running pumps in the system run at
maximum speed.
®
Controller mode for Multiple pumps in Synchronous Cascade
It is the control mode, provided for open hydraulic circuits, with which a set of pumps,
connected by mean of the Multi-pump Protocol, maintains a constant pressure at any flow
demand: typical is the use of the Hydrovar
P26 to P37 (see par. 7.5.3).
pump, which gives to the set of drives the feedback pressure signal (by mean of External
Pressure Sensor input [9,10] par. 5.5, configured by P40): MSY will always try to minimize the
error between the pressure set-point and the feedback pressure signal.
pump Protocol.
pressure by running at the same frequency.
*
]
*
]
®
algorithm, based on the set of parameters from
®
algorithm, based on the set of parameters from
®
controller for small changes in demand.
en – Original instructions
37