Baldor MN770 manual Section Troubleshooting, DC SCR Control

Page 38

Section 6

Troubleshooting

DC SCR Control

Roughness of car ride quality and instability of motor operation are often a result of poor

 

mounting of the feedback device. Incorrect adjustment of the ARM GAIN and/or the

 

RATE PROP GAIN can also cause speed instability and oscillation of the car. If

 

adjustment of RATE PROP GAIN does not help, check the feedback device for

 

misalignment, slippage, sensitivity to mechanical vibration. Any of these problems in the

 

coupling or the mount will affect the motor's operation. Running feedback wiring too close

 

to the AC or DC power wiring will also cause roughness. Switching parameter tables or

 

ACC/DEC tables while the speed is changing may also cause a bump in the car travel

 

due to a recalculation of the slope, required to prevent excessive jerk.

 

If wires for the feedback device are placed too close to AC or DC power wires,

 

roughness of motor operation may result. This is due to the induced noise from the

 

power wires. Other causes could be 1.) selecting a different parameter table or 2.)

 

selecting a different ACC/DEC table while motor speed is changing. Either of these

 

changes may also cause a bump in the car travel due to a recalculation of the slope.

 

Noisy motors often result from insufficient filtering of the 360 Hz AC ripple of the DC

 

output voltage. An SCR based control is not capable of producing ªgenerator qualityº DC

 

voltages, so a filter assemble (made from a DC-rated inductor and non-polarized

 

capacitors) on the DC loop is often used to reduce or eliminate noise.

 

Fuse blowing may result if the ARM GAIN setting is too high for the application. Reduce

 

the ARM GAIN by 50% and verify proper operation.

 

Other problems should result in a fault displayed as an entry in the Fault Log. Refer the

 

the Series 20H manual on how to access and interpret these faults. Additional

 

troubleshooting information is also in this manual.

MN770

Troublehsooting 6-1

Page 37 Page 39
Image 38
Page 37 Page 39
Contents Elevator Application Guide MN770Table of Contents Ii Table of Contents MN770 Drive Definition Section General InformationIntroduction ModernizationsLimited Warranty Safety Notice Underwriter Laboratory requirements VAC or 460 VAC maximum per control ratingPerform a ªMeggerº test. Failure to disconnect motor from Overview FeatureSection Technologies Drive Performance ComparisonDC SCR Control 20H 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 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-upFinal Set-up Slip Adjustment ValueRated Motor Load Slip Adjustment Value 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.
Top Page Image Contents