Settings; Startup - Xylem LOWARA GVA Manual De Instalación Y Operación

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5.

Settings

Disconnect the power supply before making any adjustments.
For the settings, refer to the converter operating instructions.
Operation
The starting and stopping of the pumps are determined based on the pressure settings of the controller.
Each frequency converter is connected to a pressure transmitter. The converters share all the information
and provide for cyclic changeover.
The figure shows the operating method with the curves for two pumps
- The tank supplies water upon demand by a user.
- When the pressure drops below the PS value, the first
pump is started and the speed is adjusted to maintain
a constant pressure as the demand increases
- If the demand keeps increasing and the pump reaches
maximum speed, the second pump is started and the
speed is adjusted to maintain a constant pressure. The
pumps all operate at the same speed.
- When the demand decreases the speed is reduced
until minimum speed is reached; at this point one of the
pumps is deactivated.
- If the demand decreases further the pump slows down,
fills the tank and then stops when the PS value is
reached
Converter Adjustments
If you need to modify the settings, refer to the converter operating instructions. Use the converter keypanel
to set a new pressure adjustment value, select the language, view the latest alarms or access all the
adjustment settings.
Tank Precharge
To ensure its proper operation, the membrane tank must be precharged to 0.9 x adjustment pressure
value. The precharge operation must be performed with the tank empty.
6.

Startup

To start the set, proceed as follows:
a) Connect the water supply.
b) Connect the power supply.
c) Check the tank precharge value
d) Close the pump delivery valves
e) Prime the set (see pumps' handbook) and the suction manifold
f) Operate the switch on the panel to supply power and set the converter to manual mode operation
g) Start the first pump
h) Slowly open the pump delivery valve and bleed the air.
i) Repeat the above operations for the other pumps.
j)
Set the converters to automatic mode operation
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