Schneider Electric 58 TRX manual Optional Isolation/Bypass Contactors, Harmonic Analysis, 229

Class 8998 Motor Control Centers

Sample Specifications

2.14 Optional Isolation/Bypass Contactors

a.The AC drive controller unit shall include a UL Listed option [NEMA rated isolation and bypass contactors packaged as a separate MCC unit with steel barriers segregating the AC inverter from the bypass starter] [IEC rated isolation and bypass contactors integrated with the AC inverter as one MCC unit to reduce space] complete with thermal overload relay, disconnect interlocked with the door, control circuit transformer, motor flux decay timer, and an AFC/OFF/BYPASS switch. The operator shall have full control of the bypass starter by operation of the door-mounted selector switch.

2.15 Harmonic Analysis

NOTE: The amount of harmonic distortion at the point of common coupling (PCC) is due to the distribution system characteristics (impedance of the source) and the power source size relative to the AC drive load. The harmonic current magnitude and voltage distortion values can be predicted through computer modeling. If the resulting calculations determine that the harmonic distortion will be above the IEEE-519 specification of 5%, a line reactor can be supplied to lower the harmonic levels. The line reactor is mounted at the AC drive input to reduce the current harmonics that are fed back into the supply.

a.A harmonic analysis shall be performed and priced as a separate line item by the AC drive controller unit manufacturer based upon system documentation consisting of, but not limited to, one-line diagrams and specific distribution transformer information consisting of kVA, %Z, and X/R data. The data shall consist of but not be limited to total harmonic voltage distortion and total rms current.

b.The line reactor, if required, shall be provided as a separate, ventilated [NEMA Type 1 Gasketed] [NEMA Type 1] MCC unit completely factory wired and tested with the AC drive controller unit.

PART 3: EXECUTION

3.01 Inspection

a.Verify that the location is ready to receive work and the dimensions are as indicated.

b.Do not install the AC drive controller unit until the building environment can be maintained within the service conditions required by the manufacturer.

3.02 Protection

a.Before and during the installation, the AC drive controller unit shall be protected from site contaminants.

3.03 Installation

a.Installation shall be in compliance with the manufacturer’s instructions, drawings, and recommendations.

b.The AC drive controller unit manufacturer shall provide a factory-certified technical representative to supervise the contractor’s installation, testing, and start-up of the AC drive controller unit(s) furnished under this specification for a maximum total of [_____] days.

3.04 Training

a.An on-site training course of [_____] training days shall be provided by a representative of the AC drive controller unit manufacturer to plant and/or maintenance personnel, and quoted as a separate line item.

09/2003

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