Baldor MN770 Contactor, Armature Enable, Field, ªDrive ONº Opto Output, Brake Release Signal

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Recommended Power Up/Down Sequence for Elevators Using DC SCR Controls

The following is a recommended sequence for turning on and off the elevator drive and external OEM control. Figure 5-4 shows this sequence.

Figure 5-4 Typical Power Up/Down Sequence for DC SCR Controls.

TURN-ON

RUN TIME

TURN-OFF

M Contactor

Closed

 

 

 

 

Open

 

 

 

 

 

 

 

 

 

 

 

 

20msec

 

 

 

 

 

Armature Enable

On

 

Off

 

 

 

 

 

 

 

 

 

 

Forcing

Field

 

 

 

 

Running

 

 

 

 

 

 

Economy

ªDrive ONº

On

 

Opto Output

Off

 

 

 

 

 

 

 

 

 

Brake Set Time

Engaged

Brake Release Signal

(from elevator controller) Disengaged

50msec

Contract Speed

Speed Command

Zero FPM

Closed

Open

20msec

On

Off

Forcing or ªLevelingº

Running

Standing or Economy

Engaged or ªSetº

Disengaged or ªPicked Upº

50msec

Sequence:

1.Close the M Contactor. Approximately 20msec is required for the contacts to close and connect the Control to the Motor and complete the armature loop.

2.The filed is controlled independently of the armature. The field can be at running voltage (or at forcing voltage) prior to actual commanding speed.

3.Armature enable (pin J1-8 of the DC SCR Control) allows the SCR's to begin firing.

4.The ªDrive ONº Opto output from the DC SCR Control provides an indication (for the elevator control) that the drive is ready to act on Speed or Torque commands.

5.Zero speed command should be held until the brake has actually disengaged, allowing the car to move.

5-4 Set-Up Information

MN770

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Contents MN770 Elevator Application GuideTable of Contents Ii Table of Contents MN770 Introduction Section General InformationDrive Definition ModernizationsLimited Warranty Safety Notice Perform a ªMeggerº test. Failure to disconnect motor from VAC or 460 VAC maximum per control ratingUnderwriter Laboratory requirements Section Technologies FeatureOverview Drive Performance Comparison20H Control DC SCR Control15H Control Inverter21H Control 17H & 18H Controls Vector22H Control Section Application Considerations Electric Drives Operating Mode Common Control FeaturesAvailable Operating Modes US Measurement System Elevator Motor Horsepower SelectionMetric Measurement System Motor Sizing OCW = Dynamic Brake Hardware SelectionGeneral Considerations Section Hardware InformationEncoder Retrofit Cable PreparationEncoder Cables Differential Connections Encoder Cable ConnectionEncoder End Control End Single Ended ConnectionsBuffered Encoder Output DC SCR Controls Section Set-Up InformationField Control FeedbackOverload = Fault Following Error = on Torque Proving = on Final InstallationFinal Adjustments Brake Release Signal Armature EnableSpeed Command ContactorInverter Controls Initial Installation and StartupPage TURN-ON Vector Controls Full Load Test Balanced Car TestSeries 18H Control Considerations Final Wiring ConnectionsInitial Set-up ProcedureRated Motor Load Slip Adjustment Value Slip Adjustment ValueFinal Set-up Power Up/Down Sequence for Vector Controls Date Pre-Installation TestsVector Control Worksheet Set-Up Information MN770 Section Troubleshooting Electrical Noise Display Electrical Noise Considerations R-C Snubber Circuit & twisted-pair10HP, 460VAC Drive 30HP, 500VDC Drive, Shielded 10 Isolated Mounting Method Power Wiring Wiring PracticesAnalog Signal Wires Encoder CircuitsPlant Ground Optical IsolationOptical Couplers Fiber OpticsLoad Weighing / Torque Feed Forward Appendix aDescription of Operation Table A-1Serial Communications Appendix BAppendix B MN770 Elevator Industry Glossary Appendix CPage Page Appendix C MN770  Baldor Electric Company MN770 97 C&J300 Box

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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