Adjustment in drive/assembly erection

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i) Manual

a) By use of emergency handle, operate the coupled disconnector and observe whether it is fully OPEN or CLOSE at each end of its operating cycle

b) If isolator does not CLOSE fully remove clamping bolts and turn mechanism slightly towards /OPEN and retighten bolts proceed turning isolator towards CLOSED.

c) Repeat until satisfactory operation is obtained.

ii) Electrical

a) Make electrical connections by referring to contract diagram of connections of incoming supply.

b) Do not attempt to operate the disconnector under power at this stage.

c) When selector switch is fitted set it to LOCAL

d) When AC Motor is fitted manually set mechanism to mid position.

e) Operate control Switch and at the same time observe whether the mechanism rotates towards the selected position

f) If it rotates in opposite direction to that selected stop motor immediately by switching off power supply.

g) If necessary reverse the to phases of motor supply.

iii) Open and Close Push Buttons

The Control Push Buttons determine the direction of travel of the isolator. When a cycle is initiated by switching to the appropriate position the isolator will open or close. Once the mechanism has received a signal the push button can be released. The mechanism will complete the operation and will not respond to further signals until it has completed its operation. An indicator, shows the isolator position either OPEN or CLOSE outside the cabinet at the base of the output shaft.

iv) Selector Switch

When the selector switch is set to LOCAL, operation of the mechanism will be governed by the controls in the cabinet.

Setting the selector switch to REMOTE transfers controls of the mechanism to remote control point.

v) Heater and Heater Switch

An anti-condensation heater is fitted in the bottom of the cabinet.

It should be switched on at all times, ensuring that the temperature inside the cabinet exceeds the temperature outside. The heated air leaves the cabinet by way of breather around the output shaft and cool air is sucked in. A switch is mounted on the front of the control panel for the control of the heater through a thermostat.

vi) Open and Close Contactors

These contactors are mounted side by side on the rear of the electrical control panel. They directly control the reversing operation of the motor. Further contacts are used for electrically interlocking the contactors, providing a sealing circuit across the 'OPEN' and 'CLOSE' Push Buttons.

vii) Auxiliary Switches

Silver plated contacts with a positive wiping action are used giving reliable making of low current signalling circuits under adverse climatic conditions.

viii) Fuse Links

Fuses for the control and heater circuits are mounted on the control panel. Connections to these are made in the same manner as connections to terminal blocks. The fuse wire is

routed through the top of the carrier. The current ratings of fuse-links are shown on the schematic diagram drawing.

For opening the Isolator a similar sequence of operation will be executed by pressing the push button for opening.

ix) Manual Operation

The mechanism may be operated manually in the event of a motor power failure with the help of manual operating handle.

CHECK FORMAT

8.9 Check Format

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1. Proper unloading arrangement has been made at site (Preferably with crane) to unload the packages.

Yes/No

2. All items have been checked with the packing list, MICC, Challans GR etc.

Yes/No

3. After unloading the visual inspection of the packings has been carried out along with the erection contractor and preferably with the manufacturer of the equipment.

Yes/No

4. Any type of damage to the equipments/components during transportation or any missing items has been brought to the notice of the panel supplier.

Yes/No

5. Site where isolator is to be erected is ready before the starting of erection work.

Yes/No

6. Level of the structure assembly has been checked during erection using spirit level

Yes/No

7. Site where isolator is to be erected is ready before the starting of erection work.

Yes/No

8. Level of the top surface of isolators has been checked during erection, alignment & level of equipment

Yes/No

9. Centre line of all the poles in different phases are aligned. Yes/No 10. Centre line alignment of male & female assembly has been

checked

Yes/No

11. Before fitting, the crane rings have been identified for male and female assembly

Yes/No

12. Moving parts have been operated 2-3 times for checking the free movement

Yes/No

13. The rotation of motor is in right direction Yes/No 14. In case it is in opposite direction the same has been corrected

by altering of the phase sequence of the motor terminal.

Yes/No

15. Lifting of tandem pipe assembly is with proper size rope Yes/No 16. During erection movement of earthing blade has been checked Yes/No 17. Contact fingers of earthing blade and moving towards the fixed

contact

Yes/No

18. All fixing bolts have been tightened to keep the earth switch in proper close/open position

Yes/No

CHAPTER-9