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Section 3

Maintenance & Troubleshooting

Maintenance & Troubleshooting 3-1

MN605

General Inspection

Inspect the motor at regular intervals, approximately every 500 hours of operation or every 3

months, whichever occurs first.  Keep the motor clean and the ventilation openings clear.  The following

steps should be performed at each inspection:
1. Check that the motor is clean.  Check that the interior and exterior of the motor is free of dirt, oil,

grease, water, etc.  Oily vapor, paper pulp, textile lint, etc. can accumulate and block motor

ventilation.  If the motor is not properly ventilated, overheating can occur and cause early motor

failure.

2. Periodically measure the motor winding resistance to ensure that the integrity of the winding

insulation has been maintained.  Record the motor winding resistance.  Immediately investigate any

significant drop in insulation resistance.

3. Check all electrical connectors to be sure that they are tight.
4. Check for too much vibration or looseness. It may be caused by improper alignment, an unbalanced

coupling sheave, damaged motor bearings, or loose mounting bolts. Excessive vibration will damage

the motor bearings, brushes and commutator.

5. Listen for unusual noises, especially in the area of the bearings. Also, rubbing or rumbling noises

could be signs of internal damage. Check for loose parts on the motor such as thru bolts, hold down

bolts, bad alignment of hoods, etc. An unbalanced armature or load may also cause noise.

Note: Motors applied with rectified power supplies will often make a humming noise when operating

normally. This is even more noticeable at lower operating speeds. If you can hear a growling or

erratic hum, the power supply should be checked for proper operation and phase balance.

Improper adjustment or functioning of the power supply can cause overheating of the motor and

shorten its life.

6. At start

up, check the tightness of the main and commutating pole bolts (external on the frame) as

listed in Table 3-1. Loose pole bolts could be a source of unpleasant noise when rectified power runs

the motor.

Table 3-1  Torque Specifications for Commutating and Main Pole Bolts

Frame

Bolt Size

Torque (lb-ft)

180AT

3/8 - 16

24 - 30

210AT

3/8 - 16

24 - 30

250AT

3/8 - 16

24 - 30

280AT

1/2 - 13

60 - 75

320AT

1/2 - 13

60 - 75

360AT

3/8 - 16

24 - 30

400AT

3/8 - 16

24 - 30

500AT

1/2 - 13

60 - 75

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Summary of Contents for Reliance CDX7150

Page 1: ...ss underutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos...

Page 2: ...Integral Horsepower DC Motor Installation Operating Manual 2 09 MN605 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 3: ...Any trademarks used in this manual are the property of their respective owners Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 4: ...2 Conduit Box 2 2 Power 2 2 Motor Connections 2 2 Thermostats 2 3 Initial Start Up 2 5 Coupled Start Up 2 5 Section 3 Maintenance Troubleshooting 3 1 General Inspection 3 1 Lubrication Bearings 3 2 T...

Page 5: ...ers Filters 3 8 Troubleshooting 3 8 Armature Overheating 3 8 Field Coil Overheating 3 9 Excessive Load 3 9 Jogging and Repeated Starts 3 9 Heating 3 9 Thermostat 3 9 Troubleshooting Chart 3 10 Accesso...

Page 6: ...nel should attempt the installation operation and maintenance of this equipment WARNING Disconnect all electrical power from the motor windings and accessory devices before disassembly of the motor El...

Page 7: ...are used for lifting a motor be sure they are securely tightened The lifting direction should not exceed a 20 angle from the shank of the eye bolt or lifting lug Excessive lifting angles can cause dam...

Page 8: ...ransportation Improper motor storage will result in seriously reduced reliability and failure An electric motor that does not experience regular usage while being exposed to normally humid atmospheric...

Page 9: ...on brushes should be lifted and held in place in the holders above the commutator by the brush holder fingers The commutator should be wrapped with a suitable material such as cardboard paper as a mec...

Page 10: ...o minimize vibration and maintain alignment between the motor and shaft load Failure to provide a proper mounting surface may cause vibration misalignment and bearing damage Foundation caps and sole p...

Page 11: ...ctural or decorative parts of the driven equipment 2 Providing covers for the rotating parts Covers should be sufficiently rigid to maintain adequate guarding during normal service Power Connection Mo...

Page 12: ...B C C 5V COMMON Electrically Isolated Encoder Color Codes for Optional Baldor Encoder Cable Standard Receptacle MS3112W12 10P Standard Plug MS3116J12 10S Thermostats The thermostat is a pilot circuit...

Page 13: ...drawing or rotation arrow shown on the blower housing Refer to Figure 2 1 Figure 2 1 View from Air Inlet Motor is on Opposite Side Air Inlet Housing Impeller Blades Airflow Table 2 4 Electrical Data F...

Page 14: ...otor may reach destructive high speeds If the direction of rotation needs to be corrected disconnect the input power supply and interchange the appropriate leads Refer to the motor connection diagrams...

Page 15: ...2 6 Installation Operation MN605 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 16: ...sive vibration will damage the motor bearings brushes and commutator 5 Listen for unusual noises especially in the area of the bearings Also rubbing or rumbling noises could be signs of internal damag...

Page 17: ...to 210 incl 132 5500 Hrs 12000 Hrs 18000 Hrs 22000 Hrs Over 210 to 280 incl 180 3600 Hrs 9500 Hrs 15000 Hrs 18000 Hrs Over 280 to 360 incl 225 2200 Hrs 7400 Hrs 12000 Hrs 15000 Hrs Over 360 to 500 in...

Page 18: ...Remove grease outlet plug 3 If motor is stopped add the recommended amount of grease If motor is to be greased while running a slightly greater quantity of grease will have to be added Add grease slow...

Page 19: ...ositioning of the brush box During periodic inspections check that electrical connections are tight and properly insulated Brush Springs Brush springs should be inspected for proper tension during bru...

Page 20: ...ofit motors Contact your local Baldor District Office or an Authorized Baldor Service Center for technical assistance Do not change brush grades or the number of brushes per pole Doing so may void the...

Page 21: ...he commutator surface With increased loads and increased spring pressure this condition can be avoided Grooving May result from an overly abrasive brush grade The more common cause is poor electrical...

Page 22: ...ature must be removed from the motor and the commutator machined by a qualified repair shop Rapid Commutator Wear Light electrical loads and contamination are the usual causes of rapid commutator wear...

Page 23: ...e an averaging type ammeter if the motor s power is coming from a rectifier or SCR control Jogging and Repeated Starts Repeated starts or jogs of motors may reduce the life of the brushes and winding...

Page 24: ...nded winding Perform dielectric test and repair as required Improper connections Inspect all electrical connections for proper termination clearance mechanical strength and electrical continuity Refer...

Page 25: ...hat the motor is designed for vertical mounting Fan Cover Lint Screen To prevent build up of debris on the cooling fan Nameplate Additional stainless steel nameplates are available Roller Bearings Rec...

Page 26: ...d AC 3 Drive generator at rated RPM 4 Measure the voltage across A1 and A2 Voltage should be 150 to 200 of F1 to F4 voltage When A1 to A2 voltage level reaches this level approximately 30 seconds care...

Page 27: ...3 12 Maintenance Troubleshooting MN605 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 28: ...ries Motor CW Rotation Facing Commutator End Armature A1 A2 S2 S1 Compound or Stabilized Shunt Motor CCW Rotation Facing Commutator End High Voltage Field Connection Shunt Field F1 F2 F3 F4 A1 A2 S2 S...

Page 29: ...d Interpole Series Field Comm Field Shunt Field Shunt Motor CW Rotation Facing Commutator End High Voltage Field Connection Armature Shunt Field Interpole Field Reversing Shunt Motor CCW Rotation Faci...

Page 30: ...Baldor District Offices Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Page 31: ...reserved Printed in USA 2 09 BALDOR ELECTRIC COMPANY World Headquarters P O Box 2400 Fort Smith AR 72901 2400 479 646 4711 Fax 479 648 5792 www baldor com Artisan Technology Group Quality Instrumentat...

Page 32: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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