Baldor MN770 manual Table A-1, Description of Operation

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The parameters and inputs used for torque feed forward are indicated in the Table A-1. For a Vector control, the OPERATING MODE selected will be BIPOLAR or 15 SPEED. For a Series 20H DC SCR control, BIPOLAR HOIST or 7 SPEED HOIST should be selected.

Table A-1

Analog Command

Input Terminal

Input Range and

Description

Select Parameter

Location

Type

 

 

 

 

 

10V W/TORQ FF

J1-4, 5

±10 to +10VDC

This input is bipolar. The polarity of the signal selects

 

(J4-4, 5 for Inverter)

Differential

the direction and speed of travel.

 

J1-2

±10 to +10VDC

This input is bipolar and controls the Torque Feed

 

(J4-2 for inverter)

 

Forward value. Torque is proportional to current. The

 

 

 

input voltage is scaled to the PK Current Limit value of

 

 

 

the control. +10VDC = PK Current Limit parameter

 

 

 

value for positive torque, +5VDC= 1/2 the PK Current

 

 

 

Limit parameter value and 0VDC= zero current.

 

 

 

Negative input voltages represent negative torque.

 

J1-1

common

Input reference (J1-2 or J4-2).

 

(J4-1 for inverter)

 

 

 

Note: It may be necessary to connect J1-4 or J1-5 to J1-1 (ground). This will

 

 

provide a single ended input range of 0 to 10VDC or 0 to ±10VDC.

 

Description of Operation

 

 

This input signal should be applied to the control prior to the control ENABLE signal and

 

the release of the holding brake. The control will then generate the commanded torque

 

when the control is enabled and the holding brake is released. This occurs because the

 

initial current will be greater than the MAG AMPS value. This will generate torque and

 

because it is directly proportional to the measured load, it will prevent roll back. It is not

 

necessary to remove this input during normal operation.

A-2 Appendix A

MN770

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Contents MN770 Elevator Application GuideTable of Contents Ii Table of Contents MN770 Modernizations Section General InformationIntroduction Drive DefinitionLimited Warranty Safety Notice Underwriter Laboratory requirements VAC or 460 VAC maximum per control ratingPerform a ªMeggerº test. Failure to disconnect motor from Drive Performance Comparison FeatureSection Technologies Overview20H Control DC SCR 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 OCW = Dynamic Brake Hardware SelectionCable Preparation Section Hardware InformationGeneral Considerations Encoder RetrofitEncoder Cables Single Ended Connections Encoder Cable ConnectionDifferential Connections Encoder End Control EndBuffered Encoder Output Feedback Section Set-Up InformationDC SCR Controls Field ControlOverload = Fault Following Error = on Torque Proving = on Final InstallationFinal Adjustments Contactor Armature EnableBrake Release Signal Speed CommandInverter Controls Initial Installation and StartupPage TURN-ON Vector Controls Full Load Test Balanced Car TestSeries 18H Control Considerations Final Wiring ConnectionsInitial Set-up ProcedureFinal Set-up Slip Adjustment ValueRated Motor Load Slip Adjustment Value 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 Encoder Circuits Wiring PracticesPower Wiring Analog Signal WiresFiber Optics Optical IsolationPlant Ground Optical CouplersLoad 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.

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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.

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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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