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Operation

Trouble Shooting

Between regular maintenance inspections, be
alert for signs of motor trouble. Common
symptoms are listed in the following table.

Correct any trouble immediately and AVOID
COSTLY REPAIR AND SHUT DOWN.

TROUBLE

POSSIBLE CAUSES

CORRECTION

Motor will not start.

Usually line trouble. Single phasing at starter.

Check power source. DO NOT check with motor
energized! Check overloads, controls and fuses.
Check voltage and compare with nameplate rating.

Under Voltage.

Check voltage at motor terminals. Compare to
nameplate.

Excessive Load.

Disconnect motor from load to see if it starts without
load. Reduce load or replace motor with unit of
greater capacity.

Excessive hum.

High Voltage.

Check input voltage. Check for proper connections.

Unbalanced rotor.

Balance rotor.

Excessive wear of bearings.

Replace bearings. Check to determine cause of
wear and replace as necessary. Check alignment.

Regular clicking.

Foreign matter in air gap.

Remove foreign matter.

Rapid knocking.

Bad anti-friction bearing or dirt in lubricant.

Replace bearing, clean wells and renew lubricant.

Vibration.

Misalignment in coupling or flange.

Realign motor and driven equipment.

Accumulation of dirt on fan.

Clean motor.

Vibration in driven machine.

Run motor disconnected from driven load and check
for vibration. Eliminate source in driven equipment.

System natural frequency (Reed critical).

Twisted base or flange

Excessive end play.

Shaft bent or flange face runout.

Alter rigidity of base structure.

Check flange alignment and shims.

Adjust end play.

Straighten or replace shaft. Reface or replace
housing.

Vibration following motor
repair.

Rotor out of balance; balance weights of fans
shifted on rotor.

Balance rotor.

Motor overheating. (Check
with thermocouple or by
resistance method, do not
depend on touch).

Overload.

Measure load and compare with nameplate rating.
Check for excessive friction in motor or complete
drive. Reduce load or replace motor with unit of
greater capacity.

Single phase.

Check current, all phases.

Dirt in motor.

Check flow of air. Check
filters, if so equipped. Clean motor.

Unbalanced voltage.

Check voltage, all phases.

Rotor rubbing on stator.

Check air gap. Repair motor as necessary.

DANGER

Hazardous

voltage.

Will cause death, serious injury,
electrocution or property damage.

Disconnect all power before working on
this equipment.

Содержание CAZBHS

Страница 1: ...ous issues of ANIM 03535 2014 Siemens Industry Inc All rights reserved Installation Operation Maintenance Large Frame Vertical 680 800 1120 Frames Types CGV CGHS CGIIV CGIIHS CGGV CGGHS CAZV CAZHS CAZBV CAZBHS Induction Motors Generators ...

Страница 2: ...ical Support Communication Center Inside the U S 1 800 333 7421 Outside the U S 1 423 262 5710 Online www industry usa siemens com industry and click on Industry Services The contents of this instruction manual shall not become part of or modify any prior or existing agreement commitment or relationship The sales contract contains the entire obligation of Siemens The warranty contained in the cont...

Страница 3: ...ash clothing etc in accordance with established safety practices c Is trained in rendering first aid Danger For the purpose of this manual and product labels Danger indicates an imminently hazardous situation which if not avoided will result in death or serious injury Warning For the purpose of this manual and product labels Warning indicates a potentially hazardous situation which if not avoided ...

Страница 4: ...emove only the shipping invoice Do not remove tags pertaining to lubrication operation and storage instructions Read and follow all instructions to insure that no damage to motor bearings due to condensation and motor windings occurs during storage Use care in handling Dropping the motor or otherwise imposing shock loads can cause unseen and undetected damage to bearings This damage such as false ...

Страница 5: ...oved periodically to drain any water accumulation from the motor Consider a unit in storage when 1 It has been delivered to the job site and is awaiting installation 2 It has been installed but operation is delayed over 30 days pending completion of plant construction 3 There are long 30 day periods between operating cycles 4 The plant or department is shut down for 30 days 5 Energize space heater...

Страница 6: ...ifferent types of soil For rough calculation the foundation should be approximately 2 1 2 times total unit weight NOTE If normal vibration or noise will be objectionable as in office buildings it may be advisable to use vibration dampeners between the machine or driven drive unit and the foundation Mounting Mount the machine securely and align accurately with the driven equipment 1 Direct mounted ...

Страница 7: ...ree rotation 9 Replace coupling cover CAUTION Continuous upthrust may damage motors Eliminate upthrust before operating CAUTION Improper lubrication can cause damage to bearings Check oil reservoir for proper oil grade and level before stating or storing motor External Wiring DANGER Hazardous voltage Will cause death serious injury electrocution or property damage Disconnect all power before worki...

Страница 8: ...comes a costly reality The effect of most pump heads because of the access openings for coupling bearing and pump adjustments will lower the system reed frequency Generally the reed frequency of the unit alone mounted on an infinite mass is at least 15 above or below the unit operating speed If the system reed frequency is at or near operating speed a decision must be made to raise or lower the sy...

Страница 9: ...n indicator readings do not exceed 0 0005 inches 5 Shim flange faces if necessary Figure 3 When alignment and vibration of unit are within limits engage drive Run unit at minimum load and check for vibration continue to increase load and checking vibration until full load is obtained CAUTION Excessive vibration may cause damage to bearings or other motor components Determine and correct cause s of...

Страница 10: ...e measurements must be made carefully with instruments known to be accurate and preferably with the same instruments for both hot and cold measurements NOTE If normal vibration or noise will be objectionable as in Instruments that operate on the principle of the Kelvin Bridge are preferred See Temperature Measuring Devices IEEE Publication No 119 The cold resistance or the resistance at normal roo...

Страница 11: ...0 sec Minimum Voltage the minimum voltage also applies to starting unless otherwise specified 90 of Rated Voltage 10 sec Maximum Frequency Deviation 5 10 sec Maximum of Voltage Plus Frequency Deviation 10 10 sec Maximum Voltage Unbalance 3 1 15 sec Maximum Current Unbalance 3 8 15 sec Suggested Vibration Limits RPM 3600 1800 1200 900 and Slower Shaft mils pk to pk Alarm 4 2 8 3 2 3 8 4 5 Shaft mil...

Страница 12: ...6 If drive is disconnected run motor at no load long enough to be certain that no unusual condition exists Listen and monitor for excessive noise vibration clicking or pounding and that oil rings are turning if so equipped If present stop motor immediately Investigate the cause and correct before putting motor in service 7 If drive cannot be disconnected interrupt the starting cycle after motor ha...

Страница 13: ...articularly for reduced voltage starting and or high inertia connected loads Voltage Frequency Variation Motors will operate successfully under the following conditions of voltage and frequency variation but not necessarily in accordance with the standards established for operating under rated conditions 1 If the variation in voltage does not exceed 10 above or below rated voltage with all phases ...

Страница 14: ...and renew lubricant Vibration Misalignment in coupling or flange Realign motor and driven equipment Accumulation of dirt on fan Clean motor Vibration in driven machine Run motor disconnected from driven load and check for vibration Eliminate source in driven equipment System natural frequency Reed critical Twisted base or flange Excessive end play Shaft bent or flange face runout Alter rigidity of...

Страница 15: ...ignment Realign motor and driven equipment Excessive end thrust Reduce thrust Recheck mounting and alignment Too much grease ball or roller bearing Relieve supply to point set by manufacturer Oil leakage or excessive oil usage Excessive pressure or vacuum in bearing cavity 1 Heat exchanger tubes blocked 2 Oil stand pipe eccentric or out of round 3 Parts not properly sealed Clean tubes Straighten o...

Страница 16: ...rication A definite schedule of preventive maintenance inspections should be established to avoid breakdown serious damage and extensive downtime The schedule will depend on operating conditions and experience with similar equipment To assure adequate maintenance and warranty consideration it is essential that complete records be kept for each motor including description and rating maintenance sch...

Страница 17: ...lude a 40 C ambient temperature Operation above these temperatures will result in reduced insulation life Vibration Most problems can be detected when inspected visually Check for 1 Loose or missing parts such as fan blades nuts bolts screws couplings etc 2 Accumulation of dirt on fan or rotor 3 Associated equipment Disconnect equipment to determine where the vibration is being generated 4 Foundat...

Страница 18: ...s voltage regulators and other devices Disconnect from circuit before testing insulation resistance Insulation Resistance Check insulation resistance periodically Use a hand cranked or solid state insulation resistance tester and test with at least 500 volts but not greater than motor rated voltage For motors with newer insulation systems such as MICLAD VPI the insulation resistance after one minu...

Страница 19: ... series or in parallel to suit the available power supply if both ends of all phases are accessible If only three leads are brought out of the motor the current may be circulated between one terminal and the other two connected together If this is done the temperature of the single lead connection must be checked frequently and it is desirable to shift the leads occasionally Usually 50 to 100 of f...

Страница 20: ...let 3 Remove the drain plug and overflow plug if so equipped and clean out any hardened grease 4 Slowly pump the correct amount of grease into the grease inlet per the lubrication plate mounted on the motor Replace inlet plug and overflow plug if so equipped 5 Start motor and allow to run at least one 1 hour to expel any excess grease from the drain opening before re installing the drain plug 6 St...

Страница 21: ...and replace lost lubricant promptly CAUTION Improper oil level reading may cause improper lubrication of machine Avoid adding oil while unit is running Bearing Replacement Replacement bearings may be of a different manufacturer but must be equal to the originals used on the motor See nameplate on unit or outline drawing for bearing numbers When ordering bearings specify as follows 1 Identify numer...

Страница 22: ...ndicator body to the bearing bracket allow the button to bear on the top edge of the inner race and then rotate the shaft slowly by hand 12 Reinstall bearing shims if used reassemble end caps and end housings CAUTION Striking outer race exposes the race to brinelling Do not subject bearing to impact Protect the shaft end with a cap If bearing is reusable make certain the puller applies pressure ag...

Страница 23: ...of 0 012 0 017 inches is preset at the factory by shims between the thrust plate and the upper guide upthrust bearing Upper Guide Upthrust Bearing The upper guide upthrust bearing with a Kingsbury type bearing is located just above the rotating thrust runner and is mounted in the stationary thrust plate This bearing is babbitted on the inside diameter surface which bears on a ground and polished s...

Страница 24: ...nsion with jack or block 2 Unbolt and lift off upper bearing housing cover 3 Unbolt thrust plate from bearing housing and lift off thrust plate and upper guide bearing 4 Remove lock nut from shaft and pull thrust block from shaft 5 Lift off the Kingsbury type thrust bearing from bearing housing or adapter ring Cleaning All parts of the bearing and housings must be thoroughly cleaned before assembl...

Страница 25: ... 24 Maintenance UPPER BEARING ARRANGEMENTS Figure 7 Figure 8 ...

Страница 26: ... 25 Maintenance LOWER BEARING ARRANGEMENTS Figure 9 Figure 10 Figure 11 ...

Страница 27: ... 26 Maintenance Self Release Coupling Arrangement At Top Of Motor Figure 12 ...

Страница 28: ...e of the shaft See Figure 13 for typical fixture Read the maximum and minimum values on the indicator as the shaft is rotated slowly through 360 degrees The difference between the readings shall not exceed 0 003 inches Eccentricity and Face Runout of Mounting Surfaces The eccentricity and face runout of the mounting surfaces is measured with indicators mounted on the shaft extension The point of t...

Страница 29: ...uding 1 Serial Number 2 Type and Frame Size 3 Horsepower and Speed 4 Bearing Designations It is important when ordering spare parts or discussing service to have as much data from this plate as possible Parts Identification Figures 16 through 20 are of a standard design Your motor may differ slightly A recommended list of spare parts is available upon request Figure 15 Identification Plate ...

Страница 30: ... 29 Spare Parts Figure 16 ...

Страница 31: ... 30 Spare Parts Figure 17 ...

Страница 32: ... 31 Spare Parts Figure 18 ...

Страница 33: ... 32 Spare Parts Figure 19 ...

Страница 34: ... 33 Spare Parts Figure 20 ...

Страница 35: ...ection It is used mostly in conjunction with Rigid Couplings to prevent turbine pump backspin caused by the water column receding when the motor is de energized Applicable to Hollow Shaft Only Rigid Coupling or Bolted Coupling The member to which the pump shaft is keyed Coupling is bolted to the Thrust Block so that during startup the Guide Bearing will carry the momentary upthrust Self Release Co...

Страница 36: ...all Roller Sleeve Size Drive End DE _____________________ Opposite Drive End ODE ____________ Lubrication ___________________________ Length ___________________ Diameter _________________ Internal Thread ____________ External Thread ____________ Keyway __________________ Date Installed Location Application Date Repaired or Replaced Repairs or Parts Replaced 1 Fault Repaired by Total Cost 1 Name of...

Страница 37: ...____________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________...

Страница 38: ...ANIM 03535 0814 Supercedes all previous issues of ANIM 03535 2014 Siemens Industry Inc All rights reserved Siemens Industry Inc Norwood Motor Plant 4620 Forest Avenue Norwood OH 45212 3396 513 841 3100 ...

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