Xylem HV 1.1 - 1.2 - Manual (Page 6)

6
The HYDROVAR drive head 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 frequency
converter 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 earthened. 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.
Please
note: High voltage tests of the inverter or the motor may damage the
electronic components! Hence bridge before the in- and outgoing
terminals L -N -- U- V-W.
To avoid incorrect metering by capacitors incorporated in the
electronic part isolate the motor from the Hydrovar Drive head.