Lowara e-SVE - Page 33

en – Original instructions
33
supplies to the unit the pressure feedback signal: HCS will always try
to minimize the difference between the pressure setpoint and the
pressure feedback signal.
MSE : Hydrovar® Controller mode for multiple pumps in Serial Cascade.
Pumps are managed in series: only the last activated pump modulates
the speed to maintain the set pressure, while all the others in
operation rotate at the maximum speed.
The set of pumps, connected to each other through the multi-pump
protocol, maintains a constant pressure at any flow rate: the
Hydrovar® algorithm, based on the set of parameters from P26 to P37
(see Par. 6.5.3), is implemented.
MSE mode must be set in conjunction with the use of absolute reading
pressure sensors, one for each pump, which supply to the set the
pressure feedback signal: MSE will always try to minimize the
difference between the pressure setpoint and the pressure feedback
signal.
Using the multi-pump protocol, it is possible to connect up to 3
pumps, all of the same type and with the same power.
MSY : Hydrovar® Controller mode for Multiple pumps in Synchronous
Cascade.
The pumps are synchronised: they all keep the set pressure and
operate at the same speed.
Other characteristics: as for MSE mode.
P26
Max RPM set
[ACT set-Max
*
]
rpmx10
Maximum pump speed setup.
P27
Min RPM set
[Min
*
-ACT set]
rpmx10
Minimum pump speed setup.
P28
Ramp 1 [1-250]
s
This parameter adjusts the fast acceleration time.
It affects the control of the pump for HCS, MSE and MSY control
modes (also see Par. 6.6.2).
Default: 3 s.
P29
Ramp 2 [1-250]
s
This parameter adjusts the fast deceleration time
It affects the control of the pump for HCS, MSE and MSY control
modes (also see Par. 6.6.2).
Default: 3 s.
P30
Ramp 3 [1-999]
s
This parameter adjusts the slow acceleration.
It determines:
 The Hydrovar®adjustment speed, in case of small flow rate
variations
 The constant outgoing pressure.
The ramp depends on the system being controlled, and affects the
control of the pump in HCS, MSE and MSY modes (also see Par. 6.6.2).
Default: 35 s.
P31
Ramp 4 [1-999]
s
Adjustment of the slow deceleration time (also see Par. 6.6.2).
Other characteristics: as for Ramp 3.
P32
Ramp Speed Min
Acceleration [2.0-
25.0]
s
This parameter sets the fast acceleration time.
It represents the acceleration ramp used by the Hydrovar
®
controller
until the minimum speed of the pump is reached (P27).
It affects the control of the pump for HCS, MSE and MSY control
modes (also see Par. 6.6.2).
Default: 2.0 s.
*
Depending on the type of pump used