Baldor MN770 manual Appendix C, Elevator Industry Glossary

Page 50

Appendix C

Elevator Industry Glossary

Adjusters ± The elevator mechanic who does advanced maintenance or supervisory functions in conjunction with mechanics.

Approach Speed ± A fixed speed sometimes used on high speed elevators as an intermediate speed for the last few feet before switching to the leveling speed.

Balanced Car ± A condition where the elevator car is balanced by adding weights into the car equal to the counterweight. Under this condition, the car neither falls or rises in the shaft if the brake is released and the drive disabled.

Brake ± Elevators use a spring set brake consisting of a drum acted upon by brake friction shoes. Some modern elevators now have disc brakes.

Braking Resistors ± Large resistors added externally to the motor control to absorb excess energy generated during regeneration or overhauling loads.

Braking Transistor ± Usually added to the motor control which can be switched on when a high bus is detected to bleed off excess energy to external braking resistors.

Capacity ± The load of the car expressed in pounds or kilograms (does not include car or cable weight). Car ± The cab of the elevator which is raised or lowered in the hoist way.

Commissioning ± The procedure of testing the elevator at all conditions and full loads to ensure that it meets the design criteria specified by the consultant.

Consultant ± An individual who aids building owners and architects in the design and specifications of elevators by writing performance specifications. Usually a member of NAVTP (National Association of Vertical Transportation Professionals).

Contract Speed ± The maximum speed in Feet per minute (FPM) or Meters per second (M/S) an elevator runs. Usually specified in the initial contract for the job.

Contractor ± A company which performs installation and maintenance of elevators. Usually a member of NAEC (National Association of Elevator Contractors).

Controller ± This is the computer or PLC which commands the drives. It performing the logic and sequencing for each elevator. It dispatches elevators based on call requests and provides for fault safety protection.

Controller Manufacturer ± The company which engineers the complete elevator drive system including dispatcher, computer or PLC, software, motor and control. This is usually provided as a panel for local installation.

Counterweight ± Weight added to counterbalance the elevator, usually when it is loaded to 40% of its maximum capacity. Efficiency ± Usually the efficiency of gearing on geared elevators.

Elevator Room ± With traction machines, this is located above the hoist ways and contains the motors and controls for the elevators. With hydros, the elevator room may be located on the lowest floor, adjacent to the elevators and containing the hydraulic pumps and elevator controls.

Field Forcing ± On a DC motor and control, the motor field may be supplied with more than rated voltage to over±saturate the field providing quick response.

Floor to Floor Time ± A specification of the time it would take an elevator to go from one floor to the next or multiple floors.

Following Error ± The difference between the commanded speed and the actual speed of the elevator car.

MN770

Appendix C-1

Page 49 Page 51
Image 50
Page 49 Page 51
Contents Elevator Application Guide MN770Table of Contents Ii Table of Contents MN770 Drive Definition Section General InformationIntroduction ModernizationsLimited Warranty Safety Notice Underwriter Laboratory requirements VAC or 460 VAC maximum per control ratingPerform a ªMeggerº test. Failure to disconnect motor from Overview FeatureSection Technologies Drive Performance ComparisonDC SCR Control 20H Control21H Control Inverter15H Control 22H Control Vector17H & 18H Controls Section Application Considerations Electric Drives Available Operating Modes Common Control FeaturesOperating Mode Metric Measurement System Elevator Motor Horsepower SelectionUS Measurement System Motor Sizing Dynamic Brake Hardware Selection OCW =Encoder Retrofit Section Hardware InformationGeneral Considerations Cable PreparationEncoder Cables Encoder End Control End Encoder Cable ConnectionDifferential Connections Single Ended ConnectionsBuffered Encoder Output Field Control Section Set-Up InformationDC SCR Controls FeedbackFinal Installation Overload = Fault Following Error = on Torque Proving = onFinal Adjustments Speed Command Armature EnableBrake Release Signal ContactorInitial Installation and Startup Inverter ControlsPage TURN-ON Vector Controls Balanced Car Test Full Load TestFinal Wiring Connections Series 18H Control ConsiderationsProcedure Initial Set-upFinal Set-up Slip Adjustment ValueRated Motor Load Slip Adjustment Value Power Up/Down Sequence for Vector Controls Pre-Installation Tests DateVector Control Worksheet Set-Up Information MN770 Section Troubleshooting Electrical Noise Display R-C Snubber Circuit & twisted-pair Electrical Noise Considerations10HP, 460VAC Drive 30HP, 500VDC Drive, Shielded 10 Isolated Mounting Method Analog Signal Wires Wiring PracticesPower Wiring Encoder CircuitsOptical Couplers Optical IsolationPlant Ground Fiber OpticsAppendix a Load Weighing / Torque Feed ForwardTable A-1 Description of OperationAppendix B Serial CommunicationsAppendix B MN770 Appendix C Elevator Industry GlossaryPage Page Appendix C MN770 Box  Baldor Electric Company MN770 97 C&J300

MN770 specifications

The Baldor MN770 is an impressive industrial motor designed for a variety of applications, showcasing robust construction and advanced technology. Known for its reliability and efficiency, the MN770 is manufactured by Baldor Electric Company, a prominent name in the electric motor industry.

One of the main features of the MN770 is its high-efficiency design. This motor adheres to stringent efficiency standards, helping to reduce energy consumption and lower operational costs. It typically meets or exceeds NEMA Premium Efficiency ratings, making it an excellent choice for businesses looking to optimize their energy use.

The MN770 motor is built with a durable cast iron frame, ensuring longevity and resistance to harsh operating conditions. Its weatherproof design is ideal for both indoor and outdoor applications, making it suitable for various environments, including manufacturing plants, water treatment facilities, and agricultural operations.

Another significant characteristic of the MN770 is its versatility. The motor is available in a range of horsepower ratings, allowing users to select the model that best fits their specific needs. Additionally, it offers various mounting configurations and voltage options, further enhancing its adaptability for diverse applications.

The motor utilizes advanced insulation systems and cooling technologies to ensure optimal performance and a longer lifespan. The robust design helps to dissipate heat effectively, enabling the motor to operate efficiently even under heavy loads. This characteristic is essential for applications requiring continuous operation without compromising reliability.

Moreover, the Baldor MN770 incorporates advanced design features such as precision-balanced rotors and high-performance bearings. These characteristics contribute to reduced vibration and noise levels, promoting a quieter working environment and improving overall operation efficiency.

In summary, the Baldor MN770 motor stands out due to its high efficiency, robust construction, versatility, and advanced technologies. Its ability to perform reliably in various industrial applications makes it a popular choice among engineers and facility managers. Investing in the MN770 not only enhances operational efficiency but also supports sustainability efforts by reducing energy consumption in industrial environments.
Top Page Image Contents