Method Statement Title: Testing and Commissioning of VFD’s.

Method Statement Title: Testing and Commissioning of VFD’s.

1.0       Scope

1.1       This method statement details the Testing and Commissioning of VFD’s according to the specification section 15725.

Note:   A separate method statement is submitted for installation of MCC’s and     VFD’s. (Ref. ETA /MS/E-012)

2.0       Material

• All the materials shall be as per approved material submittals.

• Size and number of VFD’s shall be as per approved shop drawing and load schedule.

• Identifications and labels.

3.0       Applicable Location

3.1       VFD’s at East & West Podium Heat Exchanger Room.

4.0       Instruments.

4.1       Insulation Resistance tester (Megger) with Variable Voltage selections.

• Phase Sequence meter.

4.3       Multimeter.

Note : The calibration certificates of testing instruments shall be verified prior to usage and copies shall be included in the test reports.

• Test Procedure:

• Power Connection :

• Megger the incoming and outgoing power cable & connections for

Insulation check & short circuit. Please note that the power cables in the VFD’s terminals must be disconnected during this test or it may damage the VFD’s.

• Reconnect the cables and all power terminals shall be checked for tightness.

• All the power cables shall be supported well so that the stress is not on the terminals.

• All fuses and overloads shall be checked for correct sizes.

5.2       Control Connection :

• All control connection terminals shall be checked for tightness and continuity.

• The screens of the screened cables shall be checked for proper earthing.

• All terminations shall be cross checked with the drawing.

• Insulation Resistance Test using 500V Megger:

• Check the tightness of connections.

• Clean all the supporting insulators.

• Isolate the cables on incoming and outgoing side.

• Apply a megger voltage of 500Volts DC between Phases ‘R’ to earth for 1 min with Phase ‘Y’,’B’ & ‘N’ shorted and earthed and record the values.

• Similarly continue the test and record the values for the other phases.

• Pre-commissioning Test:

• Check the incoming voltage & phase sequence before switching ‘ON’ the incomer.

• Check control supply and stop lock provision and operation.

• Check bypass starter operation with the motor disconnected.

• Check VFD’s operation with the motor disconnected, from the control keypad.

• Set parameters as required and record the parameters.

• Check VFD’s operations from keypad after connecting the motor, also check motor’s direction or rotation.

• Check bypass starter operation with the motor connected, also check motor’s direction or rotation.

• Check external (remote) control of the VFD’s.

• Safety:

• Only experienced and skilled personnel shall be engaged for testing.

• Safety guards shall be in place and secured prior to start-up.

• Warning signs and tapes shall be placed during start-up and commissioning as required.

• All safety procedures shall be followed in accordance with the project health and safety plan.

• Safety officer shall check and ensure all safety precautions as followed.

• Records:

• Site Test Reports.

• Calibration certificates of testing instruments.

9.0       Reference:

• Specification Section 15725.

• Approved Drawings.

10.0     Enclosures:

10.1     Site Commissioning Report for VFD’s.