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8.2 COMBO function
In the “Control parameters” menu it is possible to enable the COMBO function that allows serial communication between up
to 8 units, each one connected to a pump. The operating principle (switch on/off) of pumps is similar to as stated in chapter
8.1.
To achieve the COMBO function in a system consisting of several interconnected inverters, use a pressure sensor
connected to each one. The value of the set pressure is communicated to the slaves via the serial port.
As a further help, you can connect another two DOL pumps to the Master to cover additional water demand; they will be
operated only when all the COMBO pumps are already in operation.
RS485 serial connection
Communication is made through a private protocol using the RS485 port. Each unit must be connected to each other by using
a tripolar cable (0,5 mm
2
) wired on S+,S-,G pins on control board.
Max 240 VAC, 5 A
Max 30 VDC, 5A
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