Baldor MN770 manual Power Up/Down Sequence for Vector Controls

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Recommended Power Up/Down Sequence for Elevators Using Vector Controls

The following is a recommended sequence for turning on and off the elevator drive and external OEM control. Figure 5-2 shows this sequence.

1.Close the M-Contactor.

2.After a 20mSec minimum delay (to ensure the M Contactor is closed), close the drive ENABLE input. This will allow current to flow and the IGBT's to begin switching.

3.The ªDrive ONº Opto output will be active when the Motor MAG AMPS have reached the programmed value. Use the Drive ON opto output to energize an external coil for a relay to perform the following:

A.Signal the OEM elevator controller, computer or PLC to engage or disengage the holding brake and feed the speed command reference (pattern generator) signal into the drive. There should be a 50 milli-seconds delay between the brake release signal and the speed command signal. This allows time to release the brake mechanically.

B.The time between DRIVE ON and the ENABLE signal allows flux build-up in the AC motor. This delay should be no less than 20 mS. The TORQUE PROVING fault will prevent a DRIVE ON output if the Vector drive is not applying current to the motor due to an open contactor, broken motor lead or open motor winding. If during operations a fault occurs, then the DRIVE ON and READY both go inactive, engage the brake and open the motor contactor.

4.Once the elevator reaches the floor, a zero speed command should be held until the brakes are set.

5.Disable the Vector drive after the brake is set, and then open the M-Contactor.

Figure 5-2 Power Up/Down Sequence for Vector Controls.

TURN-ON

RUN TIME

TURN-OFF

Close M

Enable

Motor Flux

ªDrive ONº

Opto Output

Brake Release Signal (from controller)

Open M

20mSec20mSec

Enable

Motor Flux

ªDrive ONº

Opto Output

Brake Set Time

Brake Release Signal (from controller)

50mSec

50mSec

Speed Command

Speed Command

MN770

Set-Up Information 5-13

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Contents Elevator Application Guide MN770Table of Contents Ii Table of Contents MN770 Drive Definition Section General InformationIntroduction ModernizationsLimited Warranty Safety Notice Perform a ªMeggerº test. Failure to disconnect motor from VAC or 460 VAC maximum per control ratingUnderwriter Laboratory requirements Overview FeatureSection Technologies Drive Performance ComparisonDC SCR Control 20H 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 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-upRated Motor Load Slip Adjustment Value 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 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.
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