Xylem HVS 1.1 - 3.4 - Manual (Page 17)

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Control terminals
3.4.1 Control Terminals
All external used cables have to be shielded. Do not connect the mass of the electronic
components to other higher potentials.
All electronic ground and GND of the RS 485-interface are connected internal.
For external off/on and low water, switch contacts suitable for <10 V are necessary.
The control cable must be at least Ø 5mm.
If unshielded control cables are used, signal interference may occur and interfere
with the function of the inverter.
control terminals
terminals of the
RS485 interface
HVS 1.1
HVS 1.15, 1.2
HVS 3.2, 3.3, 3.4
Power supply 220V