Installation, operation, and maintenance instructions nema. Factors which affect the life span of the motor due to lack of maintenance. There are many types of ac motors, but this course focuses on threephase induction motors, the most common type of motor used in industrial applications. There are few simple rules for the maintenance for the motors.
It is therefore used in starter motors of cars and elevator motors p. Ac motors ac motors are used worldwide in many applications to transform electrical energy into mechanical energy. Safety instructions this is the safety alert symbol. Direct drive fan motors hvac motors nema low voltage ac.
Troubleshooting problems on your ac motor is relatively straightforward, and providing you. Polyphase ac induction motor troubleshooting guide. The stator is a permanent magnet, so the motor is smaller in size. From the relationships shown above among s, p, q, e, i, and.
Installation instructions extreme duck ultra q car. Be sure to read and understand all of the safety notice statements in mn408 or product specific manual. Nameplates, declaration of conformity and other collateral material may contain the. The branch circuit represents the last step in the transfer of power from the service or source of energy to utilization devices. Like most motors, an ac induction motor has a fixed outer portion, called the stator and a rotor that spins inside with a carefully engineered air gap between the two.
Unit 16 electric motors washington state university. English pdf technical description preventive maintenance for acs550 and ach550 english pdf technical description preventive maintenance for acs800 english pdf technical description preventive maintenance for sami megastar english pdf technical description. Low voltage motors installation, operation, maintenance. Electric motor predictive and preventive maintenance guide abstract electric motor performance is vital to the reliable and efficient operation of power plants. This ensures electrical equipment is kept in good working condition at all times. However, existing maintenance recommendations proposed by.
Some motors, such as a grinder, have a shaft extending from both ends. Horizontal ac small industrial motors motor installation and maintenance instructions gei 56128h. Therefore, motor troubleshooting involves the entire system, not just the. In modern plant operations, unscheduled stoppage of production or long repair shutdowns are intolerable. Installation, operation, and maintenance instructions nema 182t 286t, iec 112 180 permanent magnet motors operated on variable frequency drives vfd. This chapter will describe the most common types found on army watercraft. This remains true for most duties but may not be so where environmental conditions are aggressive, the starting duty is onerous, or high structural vibration is present.
The rotor shaft extends from one end of the motor for connection to the driven device or machine. Integral horsepower ac induction motors english pdf manual rpm ac direct drive type ctm motor cooling tower inverter duty pm motors fl250, fl280, fl320, fl360, fl400, fl440 and fl580 english pdf manual rpm ac inverter duty motors english pdf manual rpm ac inverter duty motors english pdf manual rpm xe integral. An ac motor of this type may be part of a pump or fan or. Preventive maintenance maintenance for drives abb drive. Generally speaking, motors and motor parts should be maintained and tested at least every 6 months. Free download induction motor seminar ppt, pdf report. Leeson and other major manufacturers use laminated stator, rotor and armature cores to reduce energy losses and heat in the motor. Noise for specific sound power or pressure level information, contact your local baldor representative. Maintenance and troubleshooting of electric motors reliance electric posted 11005 motor maintenance scheduled routine care introduction the key to minimizing motor problems is scheduled routine inspection and service. Installation maintenance instructions ac induction motors. The owner of the motor is responsible for ensuring all required maintenance is performed and properly documented. The only userserviceable parts on an ac motor are the brushes and the bearings. Almost all electrical equipment requires planned inspection and maintenance being carrying out.
Before starting maintenance procedures, be positive that. Safe maintenance practices performed by qualified personnel are imperative. On motors having drain plugs, remove drain plug and operate motor for 20 minutes before replacing drain plug. Spare parts, installation and maintenance of ac motors. Maintain high insulation resistance at all time and measure the insulation resistance by megger regularly. An induction motor can be defined as the ac electric motor device in which a power source fed by the alternating current with the help of a primary winding. Having these permanent magnets instead of electromagnets reduces energy losses in the motor. By convention, q is shown as positive above the horizontal, when the circuit is inductive, and vice versa when capacitive see. Installation maintenance instructions permanent magnet ac motors. Motors need maintenance regularly in order to avoid failure and prolong their lifespan. Joliet equipment corporation bringing you the best in electric motors general product information reconditioned dc drilling motors jec75zb jec75ze jec75yzf top. Only then is it possible to maintain a motors life and its efficiency. Maintenance interval for motors with baldor shaft grounding brush baldor shaft grounding motors are designed for. This course was designed to provide training for electricians, mechanics, and others, wanting to know more about ac and dc motor maintenance.
The frequency of routine service varies widely between applications. Motors are inherently highly reliable, requiring little routine maintenance. Singlephase motors introduction singlephase ac motors are the most common motors built. Improper motor storage will result in seriously reduced reliability and failure. Maintenance safe maintenance practices performed by qualified personnel are imperative.
The high cost of the resultant downtime eats deeply into profits. They have a number of other benefits when properly maintained. Insert 2 to 3 inch length of grease string into each hole on motors in nema 215t frame and smaller. A wellplanned electric motor preventive maintenance programme is the key to dependable, longlife operation of electric motors. The manufacturer of these products, baldor electric company, became abb motors and mechanical inc. Since dc machines require more attention than their ac counterparts, dc maintenance can help achieve both goals. On motors equipped with slotted head grease screw, remove screw and apply grease tube to hole. Both ac and dc motors must be manufactured with a great deal of precision in order to operate properly. Recommended maintenance practice for electric motors and.
Long term motor storage procedure mn417 storage information 11 storage storage requirements for motors and generators that will not be placed in service for at least six months from date of shipment. Generally, it is known as the asynchronous motor because its running speed is less than its synchronous speed. Rotors for ac motors are heat treated to separate the aluminum bars from the rotors magnetic laminations. Since there is such a wide variety of these motors, it is impossible to describe all of them. Virtually all electrical motors use magnetic field rotation to spin their rotors. This course consists of 12 interactive, online lessons that address ac and dc motor maintenance. Large dc motors are used in machine tools, printing presses, fans, pumps, cranes, paper mill, traction, textile m ills and so forth. Maintenance and troubleshooting three phase induction motor. Induction motor seminar ppt, pdf report study mafia.
The failure of one or more critical motors could cause lost capacity and excessive repair and maintenance cost. This is the seventh lesson in the acdc motor maintenance course. Simple steps to electric motor maintenance r baker. Ac motors are generally reliable and last a long time before needing to be replaced. Electric motor predictive and preventive maintenance guide. This standard specification describes the requirements for the contractor to overhaul ashore in a suitable repair facility an alternating current ac induction or synchronous motor removed from a coast guard vessel. Its operation is based on the principle that when a current carrying conductor is placed in a.
It is used to alert you to potential personal injury hazards. Permanent magnet ac motors pmac are just like standard induction ac motors except they have permanent, rareearth magnets attached to their rotors the center part of the motor that spins. Updated to the 2011 national electrical code, electricity 4. The very first thing that you should do before starting any type of maintenance on a motor is a visual inspection, a lot of times the trouble can be found just by looking, because if the problem is that bad then it should be very obvious by observation. Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the driven machinery. The synchronous speed of an ac motor is the speed of the rotating magnetic field set up by the stator winding synchronous speed rpm 120 x frequency divided by the number of poles. Proper maintenance and upkeep in dc motor units when cared for correctly, direct current dc drives, motors, and their controls can offer excellent reliability over a long service life.
In this article the care, repair, service and maintenance of electric squirrel cage motors has been discussed. A wellplanned preventive maintenance program is the key to dependable, longlife operation of motors and generators. X2 condenser in parallel to the ac power, as per en2400. Acdc motors installation, principle of operation, troubleshooting and repair. Preventive maintenance service for low voltage ac drives. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor.
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