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GE Energy Motors GEEP-427-I Copyright 2009, The General Electric Company, USA

43

GEEP-427-I Pegasus, Horizontal Induction Motor

TEWAC, Sleeve Bearing

Air-to-Water Heat Exchanger

General

Totally-enclosed water-air cooled machines

contain an air-to-water heat exchanger in the top cover.
Shut-off water values should be installed in both the
water inlet and outlet pipes leading to and from the heat
exchanger. When installing the piping to the heat
exchanger, care must be taken to avoid pipe strains
which put a twisting force on the water box. If this
precaution in not followed, leaks at the gasket joints
between the water box and covers, or between the water
box and tube sheets, may occur. A flow meter should
always be provided in the water supply line with high
and low flow alarm contacts. In the event of an internal
leak in the heat exchanger, the top cover has drip baffles
connected to an external fitting for ducting water. A leak
detector switch (if originally ordered) with alarm
contacts is connected to the external fitting to operate an
alarm. Provisions are available for adding a switch, if not
originally ordered.

The water-flow rate, maximum inlet temperature,

and maximum water pressure drop are indicated on the
machine nameplate. Confirm that these values are met.
The flow of water through the heat exchanger should be
regulated by the outlet value to insure that the heat
exchanger operates full of water at all times.

Efficient operation of the heat exchanger requires

that no air be collected in the cooler tubes. To prevent
collection of air, a small pipe should be connected from
the air-vent-pipe coupling to the discharge piping of the
cooler, as well as any other point to vented. It is
recommended that a small flow of water be allowed to
pass continuously to vent of any entrained air from the
water supply.

Unless otherwise specified on the purchase order,

the heat exchanger supplied with this machine must use
clean water. If the cooling water contamination is
questionable, adequate filters should be provided to keep
maximum particle size less than 3/16 inch diameter.
Water quality considerations include salinity, acidity or
alkalinity, minerals in solution and presence of particles.
All of these must not be in concentrations which would
erode, crack, or corrode the tubes. If the machine is
located in an environment subject to freezing
temperatures -- less than or equal to 0 C (32 F), provision
must be made to drain the cooler when the unit is shut
down.

After the heat exchanger has been filled with

water, and before the machine is energized, all cooler
gaskets and cooler joints should be developed during
shipment or installation of the unit.

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Содержание Pegasus MHV GEEP-427-I

Страница 1: ... information be desired or should particular problems arise which are not covered sufficiently for the purchaser s purposes the matter should be referred to GE Energy Motors Pegasus MHV is a registered trademark of General Electric Company GE Energy Motors GEEP 427 I Copyright 2009 The General Electric Company USA 1 Instructions Pegasus MHV Horizontal Induction Motor Totally Enclosed Water to Air ...

Страница 2: ...llation 7 Alignment and Coupling 9 Wiring and Grounding 12 Operation 14 Maintenance General 20 Maintenance Lube Oil Recommendation 24 Maintenance Drive End Bearing 26 Maintenance Opposite Drive End Bearing 27 Operational Difficulties 28 Spare Parts 33 Belt and Chain Drives 35 Machine Description 36 Machine Assembly 37 Maintenance Top Cover and Heat Exchanger 39 Air to Water Heat Exchanger 41 Parts...

Страница 3: ...in close proximity to machinery with high noise levels use proper care and procedures in handling lifting installing operating and maintaining the equipment before operating replace any covers that have been removed for inspection Safe maintenance practices with qualified personnel are imperative Before starting maintenance procedures be positive that equipment connected to the shaft will not caus...

Страница 4: ...by writing to the following National Electrical Manufacturers Association 2101 Street N W Washington DC 20037 American National Standards Institute 1430 Broadway New York NY 10018 Attention Sales Department The Institute of Electrical and Electronics Engineers Inc 445 Hoes Lane Piscataway NJ 08854 Attention Publication Sales Warranty considerations The warranty coverage applicable to the equipment...

Страница 5: ... there are 4 lifting lugs positioned on the frame see Fig 2 If couplings or other attachments unbalance the load an additional sling should be used to prevent tipping or rotation In all cases spreaders should be used For the 6 Pole the spreaders are important to prevent damage to the top cover while lifting the machine For the 2 and 4 Pole if the spreaders cannot be used the slings should not make...

Страница 6: ...intervals so as to thoroughly coat journals with a fresh oil film or change the rolling element under load Machines equipped with brushes should have the brushes lifted in the brush holders so they are not in contact with the collectors Outdoor storage is not recommended Aside from all the possibilities of external weather conditions erection conditions environmental conditions etc which can affec...

Страница 7: ...4 Integrity of protective coatings 5 Condition of paint discoloration 6 Signs of vermin or insect activity 7 Satisfactory space heater operation It is recommended that an alarm system be in place to operate on interruption of power to the space heaters Alarms should be responded to immediately 8 Record the ambient temperature and relative humidity adjacent to the machine the winding temperature ut...

Страница 8: ...CENT OF THE IGNITION TEMPERATURE REFER TO FACTORY FOR INFORMATION ON SURFACE TEMPERATURE DUST AND OR LINT SHOULD NOT BE ALLOWED TO BUILD UP AROUND THE SURFACE OF THE SPACE HEATERS FAILURE TO OBSERVE THESE PRECAUTIONS MAY RESULT IN DAMAGE TO EQUIPMENT INJURY TO PERSONNEL OR BOTH Foundation The mounting dimensions of the machine and the minimum foundation stiffness required to adequately support the...

Страница 9: ...ion to withstand the applied torques and normal vibration forces It is also imperative that they be supported evenly on the foundation and be located in a level plane Place the machine on the foundation sole plates if used with its shaft approximately in line with and at proper distance from the shaft of the machine to be coupled Use shims under the feet to adjust for the correct shaft height Refe...

Страница 10: ...gs A limited end float coupling permits relative but controlled axial movement between the adjacent ends of two shafts This movement should be limited value of 2xC in the table and Fig 1 below to be less than the axial clearance of the AC Machine bearing value of A B in Fig 1 below so that the limited end float coupling performs its function When the correct alignment is implemented the coupling p...

Страница 11: ...rks on the drive end Axially position the motor with respect to the machine as discussed in the section entitled GENERAL in the publication Attach a dial indicator on one coupling hub with the indicating button on the machined circumferential surface of the other coupling hub See Fig 2 Set the dial indicator zero Mark the location of the indicating button with a visible mark Rotate each of the two...

Страница 12: ...ial indicator setups 180 degrees apart are used to correct for possible axial shift of one shaft with respect to the other Use the difference in readings between the two indicators to determine the angular misalignment between the two coupling halves Add or remove shims under the feet as appropriate to correct for misalignment in the vertical plane A lateral angular movement of the unit is require...

Страница 13: ...dry for safe operation See the section entitled Insulation Resistance on page 14 This check may prevent having to break the electrical connections later The stator winding leads are terminated with connectors for bolting to corresponding connectors on the cable from the owner s power supply The bolted connections should be adequately insulated phase to phase and to ground Accessory connections Dep...

Страница 14: ...ied on the frame One at each end near the foot A pair of drilled and tapped holes with NEMA spacing and size 1 2 13 are provided in each grounding pad One additional stainless steel grounding pads are supplied inside the power terminal box in the region of the throat connection between the power terminal box and the frame These pads are used for connection of ground leads cable shield etc as may b...

Страница 15: ...will result The resulting unbalance in currents will in general be significant For example the locked rotor current will be unbalanced by the same percentage as the voltage but at operating speed the percentage unbalance of the current will be 6 to 10 times the percent unbalance of the voltage Percent Voltage Unbalance is defined as follows Percent Voltage x 100 Unbalance Where Average Voltage is ...

Страница 16: ...SE PRECAUTIONS MAY RESULT IN INJURY TO PERSONNEL Insulation resistance is determined by applying a dc voltage typically 500 or 1000 Volts across insulation measuring the current flow after the voltage has been applied for a specific length of time and then determining the ratio of voltage to current Because the current flow is low the value of insulation resistance will be great in terms of ohms A...

Страница 17: ...nt It is based on doubling the insulation resistance for each 10C reduction in temperature for conditions above the dew point It has been found to be reasonable for new windings The polarization index is frequently helpful in evaluating the cleanliness and freedom from moisture of a winding The polarization index is a measure of the change is insulation resistance with the time duration for which ...

Страница 18: ...ld be properly secured Initial test run The starting current of a motor is several times the rated current This starting current causes the windings to heat at a much higher rate than normal and causes the windings to heat at a much higher rate than normal and causes magnetic forces on the end turns to be many times normal The section of this publication entitled Frequency of Starts and Load Inert...

Страница 19: ... taken in the vertical horizontal and axial directions Table 2 Limits for the unfiltered maximum relative shaft displacement Speed rpm Maximum Relative Shaft Displacement inches peak to peak 1801 3600 0 0028 1800 0 0035 If the owner s half coupling was sent to the factory to be mounted onto the machine shaft extension the rotor is balanced with the half coupling installed Otherwise the rotor is ba...

Страница 20: ...truction Book unless otherwise stated in the sales contract are suitable for accelerating the rotational inertia of the driven equipment in accordance with Standard MG 1 21 42 The motors are suitable for the following frequency of starts 1 With the motor initially at ambient temperature two starts in succession coasting to rest between starts 2 With the motor initially at a temperature not exceedi...

Страница 21: ...re significant repairs in the course of its life it is recommended that they be done in a General Electric Service Shop WARNING BEFORE INITIATING MAINTENANCE PROCEDURES DISCONNECT ALL POWER SOURCES TO MACHINES AND ACCESSORIES FOR MACHINES EQUIPPED WITH SURGE CAPACITORS DO NOT HANDLE CAPACITOR UNTIL DISCHARGED BY A CONDUCTOR SIMULTANEOUSLY TOUCHING ALL TERMINAL AND LEADS INCLUDING GROUND THIS DISCH...

Страница 22: ...e bearing temperature and vibration amplitude should be monitored on a conditions basis If local provision has been made for readout or printout of these parameters and if contacts and relays are provided to shut down the unit in case of above normal temperatures then all that is required for inspection is to assure that the protective equipment is operational and set to detect abnormal operation ...

Страница 23: ...e rotor is removed on a less frequent schedule more of the winding is accessible For a routine inspection clean the accessible portions of the winding with a vacuum hose equipped with an appropriate non metallic wand or nozzle Refer to the Importance of Cleanliness section of this publication Note that if this is an emergency inspection instead of a routine one the first step is to look for the fa...

Страница 24: ...e below rated during the drying out process Six to eight hours depending upon the size of the unit are required for drying a winding with circulating current The winding should be thoroughly cleaned in order to remove dirt and contamination as an important part of the program to increase the insulation resistance value A thorough cleaning and drying program will usually restore the winding insulat...

Страница 25: ...bearing after 20000 operating hours The time between oil changes depends upon the severity of operating conditions Special conditions such as high ambient temperature may require more frequent changes Avoid operating motor with oxidized oil Should unusual changes in the oil color smell be apparent the cause must be investigated Cleaning The bearings housings of the motor have settling chambers int...

Страница 26: ...maker 15 Sun Oil Survis 916 Conoco Dectol 15R Texaco Regal 32R TABLE 3 STANDARD OIL FOR HORIZONTAL MOTORS GENERATORS Bearing Function Bearing Oil Viscosity at 100 F SSU and Location Type Above 1500 RPM Up to 1499 RPM All Sleeve Bearing 150 300 TABLE 4 STANDARD OIL FOR VERTICAL MOTORS Bearing Function Bearing Oil Viscosity at 100 F SSU and Location Type Above 1500 RPM Up to 1499 RPM Angular contact...

Страница 27: ...us Horizontal Induction Motor TEWAC Sleeve Bearing Maintenance Drive End Bearing Fig 1 Drive End Bearing 1 End shield bolt 2 Upper half end shield 3 Upper half end shield bolt 4 Upper bearing cap 5 Upper half bearing 6 Bearing bolt 7 Shaft 8 Lower half end shield 9 Lower half bearing 10 Oil ring ...

Страница 28: ...s holding the upper half of the end shield to the bottom half and bolts 4 holding the upper half of the end shield to the bearing housing 2 Remove two bolts holding bearing cap 5 to the lower half of the end shield and remove bearing cap 3 Remove four bolts 7 holding the upper half of bearing 6 to the lower half of bearing 10 4 Remove the upper half of the bearing 5 Jack up shaft 8 a few mils to r...

Страница 29: ...r TEWAC Sleeve Bearing Maintenance Opposite Drive End Bearing Fig 1 Opposite Drive End Bearing 1 End shield bolt 2 Upper half end shield 3 Upper half end shield bolt 4 Upper bearing cap 5 Upper half bearing 6 Cover 7 Anti rotation pin 8 Shaft 9 Lower half bearing 10 Lower half end shield 11 2 Oil rings 12 Bearing Insulation ...

Страница 30: ...he upper half of the end shield to the bottom half and bolts 3 holding the upper half of the end shield to the bearing housing 2 Remove four bolts holding cover 6 remove two bolts holding bearing cap 4 to the lower half of the end shield and remove bearing cap 3 Remove the four bolts holding the upper half of bearing 5 to the lower half of bearing 9 4 Remove the upper half of the bearing 5 Jack up...

Страница 31: ...CTICES IS RECOMMENDED TROUBLE SHOOTING CHART Trouble Possible Cause Action Motor will not start Power not connected Connect power to control and control to motor Check contacts Low Voltage Check motor nameplate value with bus voltage Wrong control connections Check connections with control wiring diagram Driven machine locked Disconnect motor from load If motor starts satisfactorily check driven m...

Страница 32: ...g Overloaded Measure loading with ammeter and compare with full load current on nameplate Reduce load Electrical load unbalance Check for voltage unbalance or single phasing Restricted ventilation Clean filters air passages and windings Check water cooling if applicable Incorrect voltage and frequency Check nameplate values with power supply Also check voltage at terminals with machine under full ...

Страница 33: ...als bound up or damaged Replace seals Bearings Noisy or Vibrating Defective bearings or rough journal Replace bearings or resurface shaft antifriction type Wrong grade of grease Remove old grease and relubricate using grease recommended by this Instruction Book Insufficient grease Remove relief plug and regrease bearing Replace plug after hour running Too much grease Remove relief plugs and let mo...

Страница 34: ...ilure Mechanical damage to insulation Obtain expert help for repair cont d Voltage surges have damaged insulation Obtain expert help for repair Excessive temperatures Obtain expert help for repair BOLT TIGHTENING REFERENCE Bolt size Torque in LB FT Dry Lubricated 1 4 20 8 7 5 16 18 17 14 3 8 16 30 23 7 16 14 50 38 1 2 13 75 56 5 8 11 150 112 3 4 10 260 188 7 8 9 400 284 1 8 580 438 1 1 4 7 1120 82...

Страница 35: ...deteriorate at an unpredictable rate over a period of time for which the mode of failure is more subtle Air filters used to remove dirt should be inspected and cleaned periodically over a period of time corrosive and other types of chemical contaminants as well as certain types of physical contaminants will cause air filters to deteriorate This may cause throttling of cooling air and an undesired ...

Страница 36: ...s originally supplied First thee Items in 1 as applicable Rotor Stator Ordering Parts A general view of the machine is given in the instruction section entitled Parts Identification When ordering parts or seeking additional information from your General Electric Company contact include the serial number and model number of the machine as well as the rating and the part number reference from the Pa...

Страница 37: ...iven equipment The relative location of the drive motor and driven equipment should permit belt or chain tightening or loosening The belt sheave gear sprocket should be mounted as close to the motor end shield as reasonably possible For V belt drives align the sheave or pulley with considerable care to avoid axial thrust on the bearings The belt tension should be such as to just prevent slippage a...

Страница 38: ...o water heat exchanger The top cover provides the supporting structure for the heat exchanger and forms the air flow passages for the internal recirculating cooling air The finned tube heat exchanger is supported along its entire length within the top cover Flanged piping connections and water box cover plates permit easy access for tube cleaning without removing the heat exchanger from this top h...

Страница 39: ... the periphery of the stator core where it is directed upward into the top cover In a dripproof machine cooling air enters the frame through openings in the end shields The air is then directed by the air deflectors into the two fans on each end of the rotor where the pressure is increased This causes the air to flow through the air passages in the rotor and stator The cool air removes the heat fr...

Страница 40: ...e is made from segmental laminations punched from magnetic silicon steel The punchings are accurately positioned and stacked to maintain a true stator bore The core is build up axially with packets of punchings separated by radial air ducts Stator flanges are located at each end of the stator core to hold the punchings together in compression The interlaminar pressure is maintained by steel straps...

Страница 41: ...ncy of inspection may be adjusted accordingly When maintaining the top cover and heat exchanger first make certain that the machine has been stopped and that voltage has been removed from all circuits Close water valves to the cooler Drain water from cooler using the drains and vents provided This can be pre plumbed at installation to prevent spillage on machine Make certain that all water has dra...

Страница 42: ...427 I Copyright 2009 The General Electric Company USA 42 GEEP 427 I Pegasus Horizontal Induction Motor TEWAC Sleeve Bearing manufacturer or by a qualified shop The heat exchanger nameplate lists the name of the manufacturer ...

Страница 43: ...nameplate Confirm that these values are met The flow of water through the heat exchanger should be regulated by the outlet value to insure that the heat exchanger operates full of water at all times Efficient operation of the heat exchanger requires that no air be collected in the cooler tubes To prevent collection of air a small pipe should be connected from the air vent pipe coupling to the disc...

Страница 44: ...minations 4 Stator Windings 5 Air Deflector 6 Fan 7 Upper Half End Shield 8 Upper Bearing Cap 9 Bearing 10 Shaft 11 Oil Ring 12 Lower Half End Shield 13 Heater 14 Conduit Box 15 Lower Half End Shield 16 Oil Sight Glass 17 Cover 18 Bearing 19 Upper Bearing Cap 20 Bearing Insulation 21 Upper Half End Shield 22 Air Deflector 23 Fan 24 Water to Air Heat Exchanger 25 Top Cover Assembly 26 Dowel Pin Fig...

Страница 45: ... assist in identifying the machine parts a general view of Fig 1 is presented in page 1 Each part is marked by a reference number for identification Use of this general view permits easy identification of each machine part When ordering spare or renewal parts include this publication and part number in addition to the model and serial number of the machine ...

Страница 46: ...GE Energy Motors 46 ...

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