Xylem hydrovar, Installation, Operation And Maintenance Manual

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7 Operation
7.1 Pre-start procedure
Electrical Hazard:
If input and output connections have been connected improperly, there is potential for
high voltage on these terminals. If power leads for multiple motors are improperly run in
same conduit, there is potential for leakage current to charge capacitors within the
frequency converter, even when disconnected from mains input. For initial start up, make
no assumptions about power components. Follow pre-start procedures. Failure to follow
pre-start procedures could result in personal injury or damage to equipment.
1. Make sure input power to unit is OFF and locked out. Do not rely on the frequency
converter disconnect switches for input power isolation.
2. In case of 1–phase AC input power, verify that there is no voltage on input terminals L
and N, phase-to-phase and phase-to-ground.
3. In case of 3–phase AC input power, verify that there is no voltage on input terminals L1,
L2 and L3, phase-to-phase and phase-to-ground.
4. Verify that there is no voltage on output terminals U, V and W, phase-to-phase and
phase-to-ground.
5. Confirm continuity of the motor by measuring ohm values on U-V, V-W and W-U.
6. Check for proper grounding of the frequency converter as well as the motor.
7. Inspect the frequency converter for loose connections on terminals.
8. Record the following motor-nameplate data: power, voltage, frequency, full load
current, and nominal speed. These values are needed to program motor nameplate
data later.
9. Confirm that the supply voltage matches voltage of frequency converter and motor.
7.2 Pre-startup inspections
Item to Inspect Description Checked
Auxiliary equipment • Look for auxiliary equipment, switches, disconnects, or input fuses/circuit breakers that may
reside on input power side of the frequency converter or output side to motor. Ensure they
are ready for full speed operation.
• Check function and installation of any sensors used for feedback to the frequency converter.
• Remove power factor correction caps on motor(s), if present.
Cable routing • Ensure that input power, motor wiring and control wiring are separated or in three separate
metallic conduits for high frequency noise isolation.
Control wiring • Check for broken or damaged wires and connections.
• Check that control wiring is isolated from power and motor wiring for noise immunity.
• Check the voltage source of the signals, if necessary.
• The use of shielded cable or twisted pair is recommended. Ensure that the shield is
terminated correctly.
Cooling clearance • Measure that top and bottom clearance is adequate to ensure proper air flow for cooling.
EMC considerations • Check for proper installation with regard to electromagnetic capability.
Environmental conditions • See equipment tech label for the maximum ambient operation temperature limits.
• Humidity levels must be 5–95% non-condensing.
Fusing and circuit breakers • Check for proper fusing or circuit breakers.
• Check that all fuses are inserted firmly and in operational condition and that all circuit
breakers are in the open position.
7 Operation
40 HVL 2.015-4.220 Installation, Operation, and Maintenance Manual