Xylem HYDROVAR HV 4.150 / 4.185 / 4.220 - Manual (Page 6)

6
All work, carried out on the HYDROVAR, may only be performed by
qualified and authorized staff.
Furthermore, take care not to short circuit the neighbouring
components when connecting the external control wires. All cable ends which
are not in use have to be isolated.
The HYDROVAR contains electronic safety devices which switch off the control
element in the event of a fault, whereby the motor has zero current but
remains energised and comes to a halt. The motor can also be halted by
mechanical blocking. If it is switched off electronically the motor is current
less from the mains voltage through the electronics of the HYDROVAR but is
not potential-free in the circuit.
In addition voltage fluctuations, especially power failures can cause the
system to switch itself off.
Repair of faults can cause the motor to start up again automatically!
The system may only be put into operation when it has been grounded.
In addition to that, equipotential bonding of all conductive pipes must be
ensured.
Please consider local installation standards!
High voltage tests of the HYDROVAR or the motor may damage the
electronic components! Hence bridge the in- and outgoing
terminals L1 - L2 - L3 / U-V-W before.
To avoid incorrect metering by capacitors incorporated in the electronic
part isolate the motor from the HYDROVAR.
The operating instructions must be read, understood and
followed by the operating personnel. We point out that we
accept no liability for damage and operating disorders
which are the result of non-compliance with the operating
instructions.