Baldor MN770 manual Section Application Considerations

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Section 3

Application Considerations

General Considerations A good understanding of elevator applications and requirements is essential for proper selection of drive components. Several classifications or categories can be identified to make selection easier. These are:

1.The speed of the car in the hoistway. Generally speaking, there are low speed, medium speed and high speed elevators.

2.The type of hoisting drive used in the elevator. These include hydraulic, mechanical and electric.

Hydraulic & Mechanical Drives Hydraulic and mechanical drive designs are typically used in low to medium speed elevators.

A rack and pinion elevator is a low speed system. The elevator is on a rack and is driven vertically by a pinion. Speed range is in the 100 to 200 FPM range. In the past, these have been powered by two AC speed motors or DC with generators. They are being modernized and converted to DC SCR controls, Inverters or Vector drives.

Hydro elevators are powered by a submerged AC motor and hydraulic pump assembly. These are generally slow speed elevators operating at 25 to 200 FPM. A hydro elevator application is limited to low rise buildings. The AC motor used in a hydro elevator is fixed speed and doesn't require an adjustable speed control.

For two-speed cable traction elevators, Baldor offers a solid-state starter that allows a soft start and stopping action with an AC induction motor. This Multipurpose control has proven itself on many elevator applications. Contact Baldor for more information on this product.

MN770

Application Considerations 3-1

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Contents Elevator Application Guide MN770Table of Contents Ii Table of Contents MN770 Section General Information IntroductionDrive Definition ModernizationsLimited Warranty Safety Notice VAC or 460 VAC maximum per control rating Perform a ªMeggerº test. Failure to disconnect motor fromUnderwriter Laboratory requirements Feature Section TechnologiesOverview Drive Performance ComparisonDC SCR Control 20H ControlInverter 15H Control21H Control Vector 17H & 18H Controls22H Control Section Application Considerations Electric Drives Common Control Features Operating ModeAvailable Operating Modes Elevator Motor Horsepower Selection US Measurement SystemMetric Measurement System Motor Sizing Dynamic Brake Hardware Selection OCW =Section Hardware Information General ConsiderationsEncoder Retrofit Cable PreparationEncoder Cables Encoder Cable Connection Differential ConnectionsEncoder End Control End Single Ended ConnectionsBuffered Encoder Output Section Set-Up Information DC SCR ControlsField Control FeedbackFinal Installation Overload = Fault Following Error = on Torque Proving = onFinal Adjustments Armature Enable Brake Release SignalSpeed Command ContactorInitial Installation and Startup Inverter ControlsPage TURN-ON Vector Controls Balanced Car Test Full Load TestFinal Wiring Connections Series 18H Control ConsiderationsProcedure Initial Set-upSlip Adjustment Value Rated Motor Load Slip Adjustment ValueFinal Set-up 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 Wiring Practices Power WiringAnalog Signal Wires Encoder CircuitsOptical Isolation Plant GroundOptical Couplers 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.
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