Xylem HYDROVAR (HV2.1 - 3.45) - Manual (Page 6)

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All work, carried out at opened HYDROVAR, may only be performed by
qualified and authorized staff.
Furthermore, care must be taken not to short circuit the neighbouring
components when connecting the external control wires and that open cable
ends which are not in use are isolated.
The HYDROVAR contains electronic safety devices which switch off the control
element in the event of faults, 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
disconnected 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 off itself.
Repair of faults can cause the motor to start up again!
The system may only be put into operation when it has been grounded.
In addition, equipotential bonding of all pipes must be ensured.
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.
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.