CAT E-Motor Equipment Shearer EL3000 Operation & Maintenance Manual SN LSW30138 – PDF DOWNLOAD

ID-Nr. EM028352 Okt. 2017

Operation and Maintenance Manual E-Motor Equipment Shearer EL3000 Serial-N°.:

LSW30138

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Operating and Instruction Manual For AC 3 Phase Induction Motor TEFC

EL55 Motor Range

IECEx TSA08.0025X Ex d 1 Motor Serial No 160061/2

Manufactured By

ATB Morley Ltd., Bradford Road, Leeds, LS28 6QA, United Kingdom.

Telephone: (0113) 2571734. Fax: (0113) 2570751.

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 1 of 24

EC Declaration of Conformity In accordance with IECEx requirements We,

ATB Morley Limited, Bradford Road, Leeds.

LS28 6QA, United Kingdom.

declares that the product (s) :Totally Enclosed Water Jacket Cooled AC Induction Motor (Ex d 1 M2 ) Model Type Poles Output Supply Voltage Phase Frequency Serial Number

EL55 Up to 4 Up to 190kW depending upon core length duty etc 600V AC 3 Up to 127 Hz 160061/2

Has been certified to the relevant International Standard by a notified body namely:Test Safe Australia, 919 Londonderry Road, Londonderry, NSW 2753, Australia Under Test Report IECEx TSA08.0025X to relevant International standards :IEC 60079-0

Electrical Apparatus for Potentially Explosive Atmospheres - General Requirements

IEC 60079-1

Electrical Apparatus for Potentially Explosive Atmospheres - Flameproof Enclosures ‘d’.

Supplementary Information

To ensure that this equipment meets the requirements of all the relevant national and international, standards and directives, the product must be installed in accordance with the installation instructions contained within this manual.

Date - August 2008 Signed for and on behalf of ATB Morley Limited

D. Walls.

Quality Assurance Manager

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 2 of 24

TABLE OF CONTENTS SAFETY INFORMATION ................................................................................................................................... 4 1.1 EXPLANATION OF SYMBOLS AND NOTES ...................................................................................................... 4 1.1.2 Warnings .......................................................................................................................................... 4 1.2 HEALTH AND SAFETY.................................................................................................................................. 4 1.3 DISPOSAL .................................................................................................................................................. 4 2

PURPOSE AND PLANNING INFORMATION ........................................................................................... 5

2.1 2.3 2.4

INTRODUCTION ........................................................................................................................................... 5 CAPABILITIES AND PERFORMANCE .............................................................................................................. 5 OPERATING ENVIRONMENT ......................................................................................................................... 5

3

MAJOR COMPONENT DESCRIPTION ..................................................................................................... 6

3.1 3.2 3.3 3.4 3.5 3.6

STATOR FRAME ......................................................................................................................................... 6 ROTOR ...................................................................................................................................................... 6 BEARINGS.................................................................................................................................................. 6 VENTILATION / COOLING ............................................................................................................................. 6 STATOR WINDING TEMPERATURE DETECTORS ............................................................................................ 6 BEARING TEMPERATURE DETECTORS ......................................................................................................... 6

4

HANDLING, TRANSIT, STORAGE AND INSTALLATION ....................................................................... 7

4.1 4.2 4.3

HANDLING AND TRANSIT ............................................................................................................................. 7 STORAGE .................................................................................................................................................. 7 INSTALLATION ............................................................................................................................................ 8

5

COMMISSIONING AND FIRST STARTING .............................................................................................. 9

5.1 5.2 5.3

INSULATION RESISTANCE MEASUREMENT .................................................................................................... 9 DRYING OUT ............................................................................................................................................ 10 STARTING ................................................................................................................................................ 10

6

OPERATING INSTRUCTIONS ................................................................................................................. 11

6.1 OPERATION ............................................................................................................................................. 11 6.2 OPERATING ENVIRONMENT ....................................................................................................................... 11 6.2.1 Cooling ........................................................................................................................................... 11 7

MAINTENANCE SCHEDULES ................................................................................................................ 12

7.1 7.2 7.3

MAINTENANCE ......................................................................................................................................... 12 INSPECTION SCHEDULE FOR EX ‘D’ EQUIPMENT ......................................................................................... 12 INSPECTION SCHEDULE TABLE.................................................................................................................. 13

8

MAINTENANCE INSTRUCTIONS ........................................................................................................... 13

8.1 8.2 8.3 8.4

BEARING REPLACEMENT .......................................................................................................................... 14 RE-GREASING BEARINGS ......................................................................................................................... 14 TORQUE WRENCH SETTINGS FOR METRIC SCREWS .................................................................................. 15 FLAMEPROOF JOINTS ............................................................................................................................... 15

9

ASSEMBLY AND DISASSEMBLY PROCEDURE .................................................................................. 16

9.1 DISASSEMBLY .......................................................................................................................................... 16 9.2 INSPECTION AND RENEWAL ...................................................................................................................... 18 General ......................................................................................................................................................... 18 9.3 WINDINGS ............................................................................................................................................... 18 9.4 BALL AND ROLLER BEARINGS ................................................................................................................... 19 9.5 REPAIRS .................................................................................................................................................. 19 9.6 ASSEMBLY PROCEDURES ......................................................................................................................... 19 9.7 MOTOR ASSEMBLY ................................................................................................................................... 20 10 FAULT FINDING……………………………………………………………………………………………….22 11 MACHINE MAINTENANCE HISTORY………………….…………………………………………………..23 12 SPARES AND SERVISE BACKUP………………………………………………………………………… 23 13 SPECIAL FEATURES - COMMISSIONING SERVICE & MAINTENANCE… ..………………………. 24

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 3 of 24

Safety Information 1.1

Explanation of Symbols and Notes Please read and follow the instructions with special care. Always pass on instructions for safety to other users.

1.1.2 Warnings

! WARNING! This word “Warning” marks those parts of the text which must be followed in order to ensure that instructions, regulations, notes and correct sequences are adhered to, and avoid damage to, or destruction of, the machine, and/or other parts of the system.

1.2

Health and Safety During operation, this machine has dangerously exposed rotating parts. Therefore, if essential protective covers are improperly removed or if the machinery is improperly used, incorrectly operated or inadequately serviced, serious damage to health or to the machinery can result.

Electrical installations in hazardous areas possess features specially designed to render them suitable for operations in such atmospheres. It is essential for reasons of safety in those areas that, throughout the life of such installations, the integrity of those special features is preserved; they therefore require initial inspection and either: a). b).

Regular periodic inspections in line with Australian Codes thereafter; or Continuous supervision by skilled personnel and, when necessary, maintenance.

These instructions should be read thoroughly before the motor is installed and run for the first time. Afterwards they should be kept handy for reference purposes.

If any of these instructions differ from the national and site safety instructions, local regulations and specific requirements of the system, then the site safety officer must be consulted on the procedure to be adopted. Where safety regulations do not exist or are not clearly defined for the tasks to be performed, then the person performing the tasks must maintain vigilance and avoid injury to himself and/or other people. No part of these instructions may be taken as an instruction to perform tasks which even given due vigilance, could result in injury and whilst every care is taken in the preparation of these instructions, every detail cannot be covered, therefore ATB Morley Limited cannot accept liability for direct or consequential damage or injury that may arise from the non observance of good practices.

In the United Kingdom, the Health and Safety At Work Act 1974 requires designers, manufacturers and suppliers of articles and substances, which are used by persons at work, to provide information regarding their safe use. Warnings of Hazards to personnel in this manual are identified by the use of capital letters.

At all times care must be taken when carrying out the instructions contained in this manual. Only recognised potential hazards have been identified as described in the previous paragraph, it must NEVER be assumed that these are the only hazards that can be encountered.

1.3

Disposal When changing lubricating grease, used material must be properly disposed of in accordance with local and relevant environmental regulations.

Contamination of soil, sewage and water systems must be avoided.

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 4 of 24

No materials contained in the construction of this product will cause a harmful effect on the environment providing that the local environmental regulations for disposal are enforced.

! SAFETY! The inspection and maintenance of this machine shall be performed only by authorised personnel, whose training has included instruction on various types of protection and installation practices, the relevant rules and regulations, and on the general principles of area classification.

These persons MUST KEEP the operating instructions provided, and other relevant documents available when carrying out the operations to which they refer and to follow that documentation.

2

Purpose and Planning Information

2.1

Introduction This machine is an asynchronous running, cage rotor induction motor, for use on three phase, alternating current supplies, and is suitable for use in Group I explosive atmospheres (mines).

The motor is a Totally Enclosed Water Jacket Cooled (T.E.W.J.C.) squirrel cage induction type and is designed in accordance with relevant principle International Standards IEC 60079-0, IEC 60079-1.

The area classification for which the equipment is certified to be used is Ex d 1

! Important Notes!

This equipment must only be used in conjunction with a suitably certified cable adaptor / gland arrangement that has been certified by a Notified Body as meeting the requirements of International Standards If at any time there is a change in the area classification or the apparatus is moved from one classified area to another, a check must be made to ensure that the type of protection, apparatus group and temperature class are suitable for the revised conditions.

2.3

Capabilities and Performance This machine has been designed, manufactured and constructed under high standards and has been tested and certified to suit the conditions described in the introduction above. However, the voltage and performance details given on the main motor rating plate MUST NOT under any circumstances be exceeded.

2.4

Operating Environment This induction motor is designed to be robust and suitable for use in operating applications as specified. The motor is not intended for use in harsh operating environments where excessive voltages, water ingress, and mechanical abuse may be present.

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 5 of 24

3

Major Component Description

3.1

Stator Frame The stator frame is manufactured from fabricated steel that supports the stator core that is an interference fit in the frame. The stator-winding core is assembled from separately insulated sheet steel laminations.

The stator winding slots are insulated with a liner material of a composite type. The coils are manufactured from class H insulated strip conductors and laid directly into the liner material in the stator core-pack slots. After winding, the core-pack is heated and subjected to a vacuum to expel air and moisture from voids in the winding. The whole unit is then impregnated with epoxy resin and baked for several hours to fully cure. This provides a high resistance to moisture and damage from vibration.

3.2

Rotor Produced from laminated insulated, high grade, low loss silicon steel with substantial laser cut steel pressure plates fitted at each end. The core is positioned on the shaft against a shoulder at one end and keywayed along the full length of the rotor core. A tab washer secures the core and castellated nut to ensure no axial movement occurs.

The rotor is of a cage pinned bar sash type with hard drawn copper bars and short circuit rings pool brazed together. The rotor is dynamically balanced in the process of manufacture to ensure that it will run with the minimum of vibration in service. The rotor is supported at each end by greaselubricated bearings.

3.3

Bearings The rotor is supported at the drive and non-drive end by rolling element bearings as indicated on the motor rating plate. The bearings are grease lubricated, as specified on the motor rating plate, and are directly mounted into the bearing end shield housings at both ends of the motor. The bearing covers are fitted with lip seals to prevent the ingress of dirt and moisture.

3.4

Ventilation / Cooling The stator is cooled by a water jacket manifold system that ensures the circulation of cooling water around the stator frame. The internal air volume of the stator frame is self-ventilated by the rotor windings providing circulating air through the windings and rotor cage.

3.5

Stator Winding Temperature Detectors Thermostats and RTDs are fitted into the stator windings for over temperature protection. Settings are to be found in the Technical Data section. The leads to these devices are terminated in the main terminal box

3.6

Bearing Temperature Detectors Both the drive end and non-drive end bearings are fitted with an Thermostat and RTD temperature sensing devices. The detectors are mounted in each bearing end shield that isin contact with the bearing faces. Settings are to be found in the Technical Data section. The detector leads terminate in the main terminal box which forms part of the non drive end housing.

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 6 of 24

4

Handling, Transit, Storage and Installation

4.1

Handling and Transit

! WARNING! This equipment must be lifted at the appropriate lifting points attached to the stator.

The lifting gear must be suitable and have the carrying capacity of the full machine weight that is stamped on the main motor rating plate.

Immediately the machine is received on site, visually examine it for damage. If damage is apparent, immediately inform the transport company involved, and ATB Morley Limited.

It is assumed that delivery into the construction programme is such that site storage does not occur, however if circumstances are such that site storage is desired, the following procedure should be adopted.

Precautionary measures should be taken in transit to protect the machine against vibration and temperature variations exceeding 20 K per hour (not only in the event of minus temperatures), otherwise initial damage, destruction of components and condensation are to be expected.

Transit are usually fitted to prevent the motor shaft moving axially or radially, within the bearing clearances, during transit or storage to combat stationary vibration damage to the rolling element bearings and raceways.

Where motors are delivered to driven machine manufacturers for lining up, necessitating transit clamp removal, then the whole unit transported to site, the transit clamps must be refitted, or if not possible, coupling, clamping or another means must be used to produce the same affect as the transit clamp.

4.2

Storage During storage in driven machine manufacturers works, or later on site, the following instructions must be followed.

The salient features of these motors are robust design and long life. To maintain these positive features, the following measures should be taken for storage:a).

The machines should be stored in a clean, dry, dust free and warm place wherever possible.

b).

Sufficient heating should be provided to keep the atmosphere and the machines well above the dew point.

c).

There should be no perceptible vibrations in the area where the machines are stored during the standstill / storage period.

d).

Should transit clamps be fitted, they must be removed to allow the following procedure.

During a standstill / storage period, at equally spaced intervals (every 4 to 8 weeks), the motor bearings should be rotated as fast as possible by hand. Alternatively, the bearings and rotor must be locked to stop rotation and vibrations causing brinelling to the bearing element raceways.

! SAFETY! Great care must be taken when turning the rotor shaft by hand as rotating components will be exposed.

A reduction in lubricating grease quality is not expected within less than 2 years.

It is also not necessary to check the bearing elements before commissioning the motor for a storage period of less than 2 years.

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 7 of 24

Should the motor experience storage in conditions of extreme sub-zero temperatures (-400C) the atmosphere must be carefully monitored to ensure MOISTURE AND CONDENSATION DOES NOT OCCUR within the motor enclosure.

Prior to commissioning, it is advisable to rotate the shaft a couple of times to check the seals are still in good working order and there are no signs of rust or corrosion evident.

If there is corrosion evident then the parts must be checked. e).

4.3

Prior to start up after storage, the insulation resistance of the windings must be measured and if it is low steps must be taken to rectify this by thoroughly drying out the windings, as detailed in our Installation Instructions. See “5 Commissioning and First Starting”, for recommended minimum insulation resistance.

Installation

!! IMPORTANT NOTES!!

Before putting this machine into first use it is essential that checks are made to ensure that the machine is suitable for use in the operating area classification.

This equipment must only be used in conjunction with a suitably certified cable adaptor / gland arrangement that has been certified by a Notified Body as meeting

the requirements of International IECEx standards.

For EL55 motors where the rotor shaft passes through the terminal cover. After refitting the terminal cover, on completion of connecting the motor incoming cables, the FLP gap and running clearance between the shaft and the terminal cover must be checked to the following figures. The minimum gap around the diameter must be 0.05mm and the maximum gap 0.5mm. These are to be checked with feeler gauges.

Always use the lifting attachments provided.

The mating surfaces of the motor mounting should be clean, except for a protecting film of clean lubricant.

Where storage of the motor has taken place in sub-zero temperatures, the motor must be brought up to room temperature (200C) at a rate of no more than 50C per hour before operation, or for temperatures below minus -10oC a minimum period of 12 hours should be allowed for stabilisation.

Before any rotation of the shaft, including that for the alignment, any transit protection or clamps must be removed and the bearings checked for being correctly lubricated.

If the motor has been in storage for a period of more than 2 years, check the quality of grease.

Grease that is soft with oil apparent is satisfactory (although it may have discoloured to a grey colour). Bearings where the grease is soft but without oil apparent should have as much grease removed as accessible and replaced with new grease; bearings where the grease is hard, like wax, must be cleared out and repacked. For the correct grade of lubricating grease, see the motor rating plate. When repacking the bearings, fill the voids in the rolling bearing elements and three-quarter fill the end caps.

To achieve rotation, connect the phases to the terminals in the main terminal box in the sequence given on the terminal connection diagram. If this has been lost, apply to ATB Morley Limited Sales Department for information, quoting the motor serial number in all communications.

Connect any protection devices to their appropriate circuits.

The stator frame must be earthed using its earthing point.

If commissioning does not immediately follow erection the machine shafts should be rotated through two and a half revolutions at least once per day.

!! IMPORTANT NOTE!!

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 8 of 24

During the Installation process it is important that the recommended number of starts is kept to a minimum. A high number of starts can seriously damage the insulation system of the motor windings and cause harmful transient over voltages.

The motor is designed for a minimum number of starts per hour of 20, in normal operation, from an inverter supply and must not be subjected to full voltage starts. Under these conditions, inverter starting, the motor is capable of more than 20 starts per hour.

Covers, which prevent contact with 'LIVE' parts must not be opened during operation.

5

Commissioning and First Starting

5.1

Insulation Resistance Measurement Before the motor is started, it’s windings must be known to be unaffected by moisture, therefore review the history of the machine and if there is any doubt, check the value of the insulation resistance.

This is temperature dependent but because the motor has not yet been run, the temperature of the windings can be taken as being the ambient temperature.

The recommended minimum values are given below. For intermediate ambient temperature use the next above.

RECOMMENDED INSTRUMENT TERMINAL VOLTAGE

MOTOR SUPPLY VOLTS

Over

Upto & Including

660V 3.3kV 6.6kV 11.0kV

660V 3.3kV 6.6kV 11.0kV 13.8kV

500V 1000V 1000V 2500V 2500V

RECOMMENDED MINIMUM INSULATION RESISTANCE IN MEGOHMS AT WINDING TEMPERATURE OF 10oC 15oC 20oC 25oC 30oC 40oC 16 11 8 6 4 2 40 28 20 14 10 5 80 56 40 28 20 10 120 84 60 42 30 15 160 112 80 56 40 20

As a further safeguard it is strongly recommended that the polarisation index of the insulation system be measured.

To obtain the Polarisation Index a mains or battery powered D.C. insulation resistance tester (Megger) must be used.

Measure the Insulation Resistance after 1 minute and again after 10 minutes.

P.I. = 10 Minute Reading 1 Minute Reading

TEST PARAMETERS MOTOR VOLTAGE 1100 1101-3300 above 3300

INSTRUMENT TEST VOLTAGE 500 1000 2000

MINIMUM ACCEPTABLE P.I. 2.0 3.0 3.0

CHECKTHAT THE ELECTRICAL POWER SUPPLY IS DISCONNECTED AND CANNOT BE RECONNECTED WITHOUT YOUR CONSENT. ENSURE THAT THE FRAME AND THE SHAFT ARE SOLIDLY EARTHED. EARTH ANY WINDINGS NOT BEING TESTED. A WINDING CAN HOLD A CHARGE FOR A LONG PERIOD, TAKE CARE WHEN EARTHING IT AFTER TESTING.

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 9 of 24

If the measured insulation resistance is still reading lower than the recommended value, contact ATB Morley Limited, Sales Department requesting advice.

Also, before the motor is started, check the switchgear for correct operation; check the rating of the fuses, check that the overload protection device operates at the full load current on the motor nameplate; check the function of all protection devices.

5.2

Drying Out The only way that moisture can be removed from the windings is by the application of heat, it is necessary that all moisture be evaporated from the insulation before it is subjected to the stress of normal voltage.

The winding temperature should be raised to at least 75oC but MUST NOT EXCEED 100oC by the use of hot air blowers or some such method, which can be used to circulate warm air through the machine windings.

!! CAUTION!!

Irrespective of the method of drying, it is essential that the temperature of the windings be brought up slowly, as any rapid heating may result in damage to the insulation layers due to expanding air and moisture being unable to escape quickly enough.

NOTE! Grease lubricated bearings should be inspected after drying out to ensure that the grease has not melted. If so, clean out and re-charge with grease.

5.3

Starting

! WARNINGS! COVERS WHICH PREVENT CONTACT WITH LIVE PARTS MUST NOT BE OPENED DURING OPERATION LETHAL VOLTAGES WILL EXIST WITHIN THE MACHINE, IMPOSE FULL SAFETY PRECAUTIONS PARTICULARLY;ENSURE THAT THE MOTOR IS CORRECTLY CONNECTED TO THE APPROPRIATE WATER SUPPLY AND THAT THECORRECT INLET AND OUTLET WATER PORTS ARE USED. THE SUPPLY SYSTEM SHOULD BE RATED AT A MINIMUM OF 15L/MIN, AT A MAXIMUM PRESSURE OF 34.5 BAR AND AN INLET TEMPERATURE OF 30OC AND THIS SHOULD BE TURNED ON BEFORE THE MOTOR IS STARTED. The motor should be uncoupled when it is first started. During the initial start check that the direction of rotation corresponds to that required by the driven machinery. Be aware of any unusual noise and vibration. Investigate and remedy the causes. If the rotation is incorrect according to the requirements of the driven machinery, refer to ATB Morley Engineering Department.

When the motor is run for the first time it should be allowed to run for a short period to allow any surplus grease to be ejected.

If all is well the motor can be connected to the driven machinery and restarted. After approximately two hours running, re-check the alignment, and when it is known that this is acceptable, locate the motor.

After the driven machine has been commissioned check the overload protection devices. During normal operation the motor must be regularly maintained and greased in accordance with the instructions given on the machine nameplate and/or in the technical section of this manual.

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 10 of 24

6

Operating Instructions

6.1

Operation Cage rotor motors are suitable for continuous rating. See above for the starting frequency.

The motor is designed to work without constant supervision, but a periodic check on its performance is advocated.

The normal reading of the ammeter, or if load varies, it’s fluctuation limits, should be known and if it deviates from the normal, the motor should be stopped and investigated as soon as it’s operational requirements permit, and the fault investigated and remedied.

When the motor is working the carcass can get warm, even reaching a condition when prolonged contact is uncomfortable, but correctly connected, effective thermal protection devices will adequately protect any motor to which they are fitted.

When bearings are equipped with RTD’s the bearings will be seen to operate at a temperature that is normally between 30°K and 50°K above the ambient temperature.

Any bearing that attains a temperature (note that this is NOT a differential above ambient) of 90°C must be stopped as soon as possible and investigated. When the combination of high ambient temperature and working differential cause the working temperature to exceed 90°C, consult ATB Morley Limited regarding the suitability of the bearing arrangement for operation at this temperature.

6.2

Operating Environment This induction motor is designed to be robust and suitable for use in normal operating applications in the area environments previously specified.

The motor is not intended for use in harsh operating environments where excessive voltages, vibration, humidity, temperature, moisture, chemical or solvent erosion, oil or grease, likelihood of water ingress, and mechanical abuse may be present.

6.2.1

Cooling The motor must be provided with an adequate supply of cooling water and a minimum of 15l/min is required, at a max pressure of 34.5 bar and an inlet temperature not exceeding 30oC.

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 11 of 24

7

Maintenance Schedules !! Important Note!!

The inspection and maintenance of this machine shall be performed only by experienced personnel, whose training has included instruction on various types of protection and installation practices, the relevant rules and regulations, and on the general principles of area classification.

7.1

Maintenance The ‘X’ indicates the recommended service period for average conditions. If operating experience shows that these require to be modified, delete the ‘X’ and insert a replacement at the desired intersection.

These revisions should occur within the length of the leader lines, these lines must NOT be extended.

The lubricant change period is based upon contamination from normal industrial atmospheres and an operating temperature of 80°C, but if atmospheric conditions are unusually polluted this period should be revised; also the life of the lubricant should be halved for each increment of 10° rise above 80°C but it must not be extended when the running temperature is less than 80°C. THE FOLLOWING TO BE CARRIED OUT WHEN FITTED / APPLICABLE

Period Task

1 Day

Read Instruments Verify Coolant Flow (Water) Examine Cables Replenish Lubricant Clean Exterior Check Winding Insulation Check Thermistor Circuits Check Security of Terminals

X

Motor Condition MOTOR RUNNING MOTOR STOPPED

7.2

1 Week

2 Week

1 Month

3 Month

6 Month

1 Year

2 Years

X X SEE MOTOR RATING PLATE / BEARING LIFE X X X X

Inspection Schedule for Ex ‘d’ Equipment Definitions of Inspection Schedule Visual Inspection :-

Weekly Close Inspection :-

Monthly

Detailed Inspection :-

6 Monthly

An inspection which identifies, without the use of accessing equipment or tools, those defects, such as missing bolts or components, which are apparent to the eye.

An inspection which encompasses those aspects covered by visual inspection and, in addition, identifies those defects, such as loose bolts, which will be apparent only by the use of equipment or tools. Close inspections do not normally require the equipment to be opened or de-energised.

An inspection which encompasses those aspects covered by close inspection and, in addition, identifies those defects, such as loose terminations, which will only be apparent by opening the enclosure.

IEC Ex TSA08.0025X EL55 TEWJC Generic O&M Aug 2008 Issue O Page 12 of 24

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