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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Baldor MN770 manual Power Up/Down Sequence for Vector Controls
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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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