Download Operating Instructions

Operating Instruction
6.2.3 Control
By using the HYDROVAR drive head for constant pressure control, together with a
pressure or differential pressure transmitter, or, if required, according to external
manual control by reference of 0,5-4,5VDC, this external signal has to be
connected to the terminals X2/1, X2/2 and X2/3 of the control terminals.
terminals of the
RS485 interface
control terminals
HV1.1
HV1.15, 1.2
6.2.4 Terminals
All externally 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 internally connected.
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.
When connecting together the variable speed pumps (max. 4 pumps) via the interface RS
485, the terminals X3/1 and X3/2 and X3/3 are to be connected in parallel by means of a
shielded cable to every HYDROVAR drive head and programmed accordingly
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