Baldor MN770 manual R-C Snubber Circuit & twisted-pair, Electrical Noise Considerations

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Electrical Noise Considerations Continued

Combining an R-C snubber and twisted-pair shielded cable keeps the voltage in a circuit to less than 2 V for a fraction of a millisecond. The waveform shown in Figure 6-3 in addition to the snubber across the coil, the adjacent wire is grounded in a twisted±pair, shielded cable. Note that the vertical scale is 1 V/div., rather than the 20 V/div. in figures 6-1 and 6-2. This shows that snubbers and twisted-pair shielded wire should be used for sensitive circuits located adjacent to coil wires.

Figure 6-3 R-C Snubber Circuit & twisted-pair

A reverse biased diode across a DC coil achieves the same result as adding an R±C snubber across an AC coil, Figure 6-4.

Figure 6-4 AC & DC Coil Noise Suppression

AC Coil

RC snubber	+
0.47 f	DC Coil	Diode
	DC Coil	Diode

33W

MN770

Troublehsooting 6-3

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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 Perform a ªMeggerº test. Failure to disconnect motor from VAC or 460 VAC maximum per control ratingUnderwriter Laboratory requirements Feature Section TechnologiesOverview 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 =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-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 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.