Xylem hydrovar, Installation, Operation And Maintenance Manual

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Item to Inspect Description Checked
Grounding (earthing) • Check for good earth connections (ground connections) that are tight and free of oxidation.
• Grounding (earthing) to conduit is not a suitable ground (earth) .
Input and output power
wiring
• Check for loose connections.
• Check that motor and mains are in separate conduit or separated screened cables.
Switches • Ensure that all switch and disconnect settings are in the proper positions.
Vibration • Check that the unit is mounted solidly.
• Check for an unusual amount of vibration.
Checked by:
Date:
7.3 Apply power
NOTICE:
• HIGH VOLTAGE. Frequency converters contain high voltage when connected to AC
mains. Installation, start-up and maintenance should be performed by qualified
personnel only. Failure to comply could result in death or serious injury.
• UNINTENDED START. When the frequency converter is connected to AC mains, the
motor may start at any time. The frequency converter, motor, and any driven
equipment must be in operational readiness. Failure to comply could result in death,
serious injury, equipment, or property damage.
• POTENTIAL HAZARD IN THE EVENT OF INTERNAL FAILURE! Risk of personal injury
when the frequency converter is not properly closed. Before applying power, ensure
all safety covers are in place and securely fastened.
1. Confirm that the input voltage is balanced with 3%. If not, correct voltage imbalance
before proceeding. Repeat this procedure after the voltage correction.
2. Ensure that optional equipment wiring, if present, matches the installation application.
3. Ensure that all operator and start enable devices are in the OFF position. Panel doors
should be closed or cover mounted.
4. Apply power to the unit. DO NOT start the frequency converter at this time. For units
with a disconnect switch, turn to the ON position to apply power to the frequency
converter.
7.4 Discharge time
WARNING:
Disconnect and lock out electrical power and wait for the minimum waiting time specified
below. Failure to wait the specified time after power has been removed before
performing service or repair could result in death or serious injury.
Frequency converters contain DC-link capacitors that can remain charged even when the
frequency converter is not powered. To avoid electrical hazards, disconnect:
• AC mains
• Any permanent magnet type motors
• Any remote DC-link power supplies, including battery backups, ups and DC-link
connections to other frequency converters.
Wait for the capacitors to discharge completely before performing any service or repair
work. Refer to the following table for wait times:
HVL Minimum waiting times (min)
2.015 ÷ 2.040 15
3.015 ÷ 3.055 4
7 Operation
HVL 2.015-4.220 Installation, Operation, and Maintenance Manual 41