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Siemens 580, 680 TROUBLE, Operation, CORRECTION, POSSIBLE CAUSES, Trouble Shooting

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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.

DANGER

Hazardous voltage.

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

Disconnect all power before working on this equipment.

TROUBLE	POSSIBLE CAUSES	CORRECTION
Motor will not start.	Usually line trouble. Single phasing at	Check power source. DO NOT check with
	starter.	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 sleeve 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 grease cavities and
		renew lubricant.
Vibration.	Misalignment in coupling or feet.	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 (resonance).	Alter rigidity of base structure.
Vibration following motor	Rotor out of balance; balance weights of	Balance rotor.
repair.	fans shifted on rotor.
Motor overheating.	Overload.	Measure load and compare with nameplate
(Check with thermocouple		rating. Check for excessive friction in motor or
or by resistance method,		complete drive. Reduce load or replace motor
do not depend on touch).		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.

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Contents

Page Table of Contents TABLE OF CONTENTS OPERATION SAFETY PROCEDURE INTRODUCTION Safety Procedures Qualified Person: Qualified Is trained and authorized to energize c.Is trained in rendering first aid Warranty Receiving Handling Temporary Storage Type Designations Ventilation Installation Motor Dimensions Location Select a location for the motor and driven unit that will: 2.Provide adequate space for motor removal without shifting the driven unit External Wiring Starting and overload control devices must be matched to motor rating. For safety or convenience they may need to be installed some distance from the motor Follow the control manufacturer’s instructions to make Angular Alignment Foot Plane To determine proper foot plane: V-Belts Hot Alignment Completing Mechanical Installation Doweling Doweling Inserting Dowel Pins Vibration Alarm Trip Timer Trip (Shutdown) Setting (1) Operation Initial Start Oil Circulating Systems For motors with oil circulating systems, proceed as follows before startup; 1.Fill motor reservoirs to normal level (see motor outline drawing) Trouble Shooting TROUBLE POSSIBLE CAUSES CORRECTION Page Maintenance Preventive Maintenance Maintenance Checklist Inspection Antifriction Bearing 1.Remove the parting bolts at the horizontal split Remove the bolts at the outer circumference of the upper half of the 3.Pull the upper bracket away from the face of the frame and remove bracket Sleeve Bearing - 1120 Frames 3.Air deflectors on sleeve bearing motors are horizontally split Vibration Most problems can be detected when inspected visually. Check for; 2.Accumulation of dirt on fan or rotor Associated equipment Foundation construction Insulation Resistance 2.3 + 1 = 3.3 (megohms) Drying Insulation 1.A warm air oven 2.Electric strip heaters Bearings Bearing Construction Insulated Bearings Antifriction Bearings Sleeve Bearings Oil Rings Oil Seals The primary purposes of the oil seal are: 1.To prevent the entrance of dirt into the bearing cavity 2.To retain the oil in the bearing cavity 3.To provide pressure regulation in the bearing cavity Sealing Parts Apply sealant as follows: Surfaces shall be clean of dirt, grease, and oil sealant. Use a gap when mating surfaces are together 4. Assemble parts 1.Ring out of round (should be round to 0.062 inch) 2.Fouling on a projection of the bearing bushing 5.Oil too cold or viscous, or oil level too high 6.Shaft not level – oil ring tends to bind Force Feed Lubrication Bearing Replacement For typical antifriction bearing configuration, see Figure The complete A.F.B.M.A 2.Identifying numerals and manufacturer stamped on the bearing Bearing tolerance class, i.e Sleeve Bearing Sleeve Bearing Replacement 500 and 580 Frames (See Figure 5) MAINTENANCE, SEALING PARTS 680 and 800 Frames (See Figure 6) 1120 Frame (See Figure 7) End Float – Sleeve Bearings Page Spare Parts Identification Parts Identification Siemens Industry Page Bearing Housing Bearing Bushing Oil Seal Oil Ring Air Seal Figure 11a. Types CGG & CAZ, 580 Frame Figure 11b. Types CGG & CAZ, 580 Frame Stator Core Internal Fan Stator Yoke Stator Coils Shaft Seal Page External End Cap TEAAC Heat Exchanger Motor, Auxiliary Blower Bearing Capsule Machine Seal Top Cover Bearing Liner Heat Exchanger Serial No Horsepower ______________ Type Speed Volts Amperes Vibration Analysis Sheet *Dominant Frequency Notes Siemens Industry