Nastec ANDO VASCO - Connectivity Parameters; Constant Pressure Operation; Introduction; The Pressure Vessel

Parameter Default Description
Dig.In.2/3 delay
t = XX [s]
1 Delay of digital inputs 2 and 3.
Digital inputs 1 and 4 have a fixed delay of 1 second.
Change PASSWORD1
Press ENT
By pressing the ENT key it is possible to change the installer level password (level 1) (default 001).
9.10. Connectivity parameters
Parameter Default Description
Language
XXXXXXX
English Language of communication with the user
BTLE connection
ON / OFF
ON Enable BTLE communication
MODBUS address
XXX
1 MODBUS address from 1 to 247
MODBUS baudrate
XXXXX
9600 MODBUS baudrate from 1200 bps to 57600 bps
MB data format
XXXXX
RTU
N81
MODBUS data format: RTU N81, RTU N82, RTU E81, RTU O81
EEPROM writing
ON/OFF
OFF Setting the writing mode of the parameters transmitted via MODBUS:
ON: the datum is saved in EEPROM
OFF: the datum is not saved in EEPROM
Change PASSWORD1
Press ENT
By pressing the ENT key it is possible to change the installer level password (level 1) (default 001).
10. Constant pressure operation
10.1. Introduction
TheVASCO - VAriable Speed COntroller can manage the running speed of the pump in such a way as to keep the
pressure constant as the water demand changes. A pressure sensor placed as close as possible to the pump is
used for this purpose.
1
2
3
4
5
6
7
1: Inverter; 2: Pump; 3: Check valve; 4: Pressure vessel; 5: Gate valve; 6: Gate valve; 7: Pressure sensor
10.2. The pressure vessel
In water systems equipped with inverters, the function of the pressure vessel is to compensate for losses (or
minimum water consumption) and maintain pressure when the pump is stopped, thus avoiding excessively frequent
start/stop cycles. It is of fundamental importance to correctly choose the volume and the pre-charge pressure of the
pressure vessel. Too small volumes do not allow effectively compensating the minimum water consumption or the
losses when the pump is stopped, while too high volumes make it difficult for the inverter to control the pressure.
It is generally sufficient to place a pressure vessel with a volume of about 10% of the maximum flow rate required,
considered in liters/minute.
Example
VASCO - VAriable Speed COntroller
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