The CL trimpot is factory set for 160% of Jumper J3 range setting. For a higher current limit setting, rotate the CL trimpot clockwise. For a lower current limit setting, rotate the CL trimpot counterclockwise. The current limit also contains I2t trip function. The control will trip according to a predetermined current vs. time function. The trip curve is directly related to the CL set point and can be changed with the CL trimpot. See Figure 23 on page 11.

CAUTION! Adjusting the CL above 160% of the motor rating may cause overheating of the motor. Do not leave the motor in a locked rotor condition for more than a few sec- onds since motor damage may occur.

G.Boost (BOOST) – Sets the amount of boost voltage to the motor. Jumper J7 is factory set to the "FIX" position, which provides a predefined amount of boost voltage for 50 Hz and

60Hz motors. To adjust the amount of boost voltage to the motor, set Jumper J7 to the "ADJ" position. The amount of boost voltage may be adjusted by the BOOST trimpot as described below. See Figure 24.

1.Connect an analog AC ammeter in series with one of the motor leads.

Note: Generally, digital or clamp-on ammeters do not yield accurate readings.

FIGURE 24

BOOST TRIMPOT RANGE

 

16

9

23

5

 

0

35

Volts

(Shown Factory Set to 5 Volts)

2.Run the motor unloaded at approximately 4 Hz (or 120 RPM).

Note: An unloaded motor with excessive boost will draw more current than a partial- ly loaded motor.

3.Adjust the BOOST trimpot until the ammeter reading reaches the motor nameplate rating.

4.Using the Main Speed Potentiometer, slowly adjust the motor speed over a 0 - 15 Hz (0 - 450 RPM) range. If the motor current exceeds the nameplate rating, lower the boost setting.

WARNING! TO AVOID MOTOR WINDING OVERHEATING AND FAILURE, DO NOT OVERBOOST THE MOTOR.

TABLE 5 – CONTROL MODE AND STATUS LED INDICATION

Control Mode

 

Status LED Information

Flash Rate

Color Sequence

 

Illumination Duration Seconds

 

 

Run

Slow Flash

Green

1

Sec On - 1 Sec Off

 

 

 

 

Stop

Steady

Yellow

Constant

 

 

 

 

 

Stand-By1

Slow Flash

Yellow

1

Sec On - 1 Sec Off

 

 

 

 

 

Short Circuit

Slow Flash

Red

1

Sec On - 1 Sec Off

 

 

 

 

I2t Fault

Quick Flash

Red

0.25 Sec On - 0.25 Sec Off

 

 

 

 

Overload

Steady

Red

Constant

 

 

 

 

Undervoltage

Quick Flash

Red - Yellow

0.25 Sec Red - 0.25 Sec Yellow

 

 

 

 

 

Overvoltage

Slow Flash

Red - Yellow

1

Sec Red - 1 Sec Yellow

 

 

 

 

Recovered Undervoltage2

Quick Flash

Red - Yellow - Off - Green - Off

0.25 Sec Red - 0.25 Sec Yellow -

 

 

 

0.5 Sec Off - 1 Sec Green - 0.5 Sec Off

 

 

 

 

 

Recovered Overvoltage2

Slow Flash

Red - Yellow - Off - Green - Off

1

Sec Red - 1 Sec Yellow - 0.5 Sec Off -

 

 

 

1

Sec Green - 0.5 Sec Off

 

 

 

 

 

Notes: 1. Only if the Forward-Stop-Reverse Switch is installed

2. Only if the control is in Manual Reset Mode (Jumper J4 set to the “MAN” position).

12

Page 13 Page 15
Page 14
Image 14
Baldor MN781W manual Control Mode and Status LED Indication
Page 13 Page 15

MN781W specifications

The Baldor MN781W is a versatile and robust motor designed for various industrial applications. Known for its high performance and efficiency, this motor is an integral component in diverse sectors, including manufacturing, agriculture, and energy production. Its design emphasizes durability, reliability, and energy efficiency, making it a preferred choice for many professionals.

One of the main features of the Baldor MN781W is its premium efficiency rating, which ensures reduced energy consumption and lower operational costs. This motor meets or exceeds the efficiency standards set by the National Electrical Manufacturers Association (NEMA), contributing to substantial energy savings over its lifespan. When compared to traditional motors, the MN781W not only helps in cutting energy expenses but also supports environmentally friendly initiatives by minimizing carbon footprints.

The MN781W motor utilizes advanced insulation materials and coating technologies, providing enhanced protection against moisture, dust, and other environmental factors. This ensures optimal performance in challenging conditions while prolonging the motor’s life. The unique design of the motor housing and internal components minimizes heat generation, which is essential for extending operational longevity and preventing breakdowns.

In terms of technological features, the MN781W incorporates state-of-the-art bearing designs that reduce friction and enhance overall efficiency. This enables the motor to operate smoothly under heavy loads, which is particularly beneficial in industrial applications requiring consistent performance. Additionally, the motor is equipped with built-in thermal protection, which automatically shuts down the motor in case of overheating, thereby preventing damage and ensuring safety.

Another significant characteristic of the Baldor MN781W is its ease of installation and maintenance. The motor is designed with user-friendly access points for wiring and inspection, allowing technicians to conduct routine checks and repairs with minimal downtime. Furthermore, its modular design supports a range of mounting options, enabling seamless integration into existing systems.

In conclusion, the Baldor MN781W stands out as a reliable, energy-efficient motor that meets the demands of modern industries. With its premium efficiency rating, advanced protection features, and easy maintenance, it is an excellent choice for any business looking to enhance operational efficiency and reduce costs. Whether used in heavy machinery or process equipment, the MN781W ensures optimal performance and reliability, making it a valuable investment in industrial applications.
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