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5 ACOUSTIC PROTECTION
For
maximum isolation effect, water lines and electrical conduit should also be isolated. Wall sleeves and rubber
isolated piping hangers can be used to reduce the sound transmitted through water piping. To reduce the sound
transmitted through electrical conduit, use flexible electrical conduit. EU and Local codes on sound emissions should
always be considered. Since the environment in which a sound source is located affects sound pressure, unit
placement must be carefully evaluated. Consult an acoustical engineer for critical
connections.
6 ELECTRICAL POWER SUPPLY
The mains power supply characteristics have to match the unit’s absorption. All power supply wiring must be sized and
selected accordingly by the project engineer in accordance with standard IEC 60364. All wiring must comply with local
code.
Impose the verification of the maximum short-circuit current at the point of installation: that it is lower than the lowest
breaking capacity among all those of the protections in the switchboard. Furthermore:
• Wiring should not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or other adverse
environmental effects.
• Check the contactors for wear - Replace if necessary.
• Check that all electrical terminals are tight - Tighten if necessary.
6.1
POWER CONNECTIONS
Protect the unit electric box power supply circuit with protection devices (not included in the supplied equipment).
Connect the line terminals with a three-core cable of a section which is appropriate to the unit absorption. The
switch and the fuses like all the power connections must comply with the regulations in force.
6.2
IMBALANCE BETWEEN THE SUPPLY TENSION PHASES
Protect the power supply circuit of the electrical panel on the machine by means of protection devices (not included in the supply).
Connect the line terminals with a four-pole cable with a section suitable for the absorption of the machine.
Everything must be carried out in compliance with the regulations in force.
• Voltage: in steady state from 0.9 to 1.1 of the rated voltage.
• Frequency: from 0.99 to 1.01 of the continuous nominal frequency and from 0.98 to 1.02 for a short time.
• Harmonics: harmonic distortion not exceeding 10% of the r.m.s. voltage between active conductors for the sum from the 2nd
to the 5th harmonic.
• A further 2% of the total r.m.s. a voltage is allowed between the active conductors for the sum of the 6th to the 3rd harmonic.
• Voltage imbalance: Neither the voltage of the reverse sequence component nor the voltage of the zero sequence
component in the supplies exceeds 2% of the positive sequence component.
• Power Failure: Power cut or zero voltage for no more than 3 milliseconds at any time in the power cycle with more than 1
sec. between successive interruptions.
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