I2t Trip Time vs Motor Current | Baldor MN781W specs

more rapid deceleration time, rotate the DECEL trimpot coun- terclockwise. For longer deceleration time, rotate the DECEL trimpot clockwise. See Figure 20.

Note: To provide increased resolution of the ACCEL and DECEL trimpots, 50% rotation covers 0.3 - 5 seconds.

Application Note: On applications with high inertial loads, the deceleration may automatically increase in time. This will slow down the rate of speed decrease to prevent the bus volt- age from rising to the overvoltage trip point. This function is called regeneration protection. It is recommended that for very high inertial loads that both the ACCEL and DECEL trimpots should not be set to less than ten (10) seconds.

FIGURE 20

DECEL TRIMPOT RANGE

	5
2.5	12.5
1.5
0.3	20

Seconds

(Shown Factory Set to 1.5 Seconds)

FIGURE 21

COMP TRIMPOT RANGE

E. Slip Compensation (COMP) – Sets the amount of			1.5
Volts/Hz/Amp to maintain set motor speed under varying		0.8				2.3
Volts/Hz/Amp to maintain set motor speed under varying
loads. The COMP trimpot is factory set for 1.5 Volts/Hz/Amp.

The slip compensation may be adjusted by the COMP trim-
pot as described below. See Figure 21.		0				3
pot as described below. See Figure 21.		0				3
1.	Wire an ammeter in series with one motor phase.
1.	Wire an ammeter in series with one motor phase.			Volts/Hz/Amp
				Volts/Hz/Amp
2.	Run the motor and set the unloaded speed to approxi-	Shown Factory Set to 1.5 Volts/Hz/Amp
2.	Run the motor and set the unloaded speed to approxi-
	mately 50%.

3.	Load the motor to the rated motor nameplate current			FIGURE 22
3.	Load the motor to the rated motor nameplate current	CL TRIMPOT RANGE
	(Amps AC).	CL TRIMPOT RANGE
	(Amps AC).
4.	Adjust the COMP trimpot so that the loaded RPM is equal		120
4.	Adjust the COMP trimpot so that the loaded RPM is equal
	to the unloaded RPM.	80			160
	to the unloaded RPM.	80			160
5.	The motor is now compensated to provide constant
	speed under varying loads.	40			200
	speed under varying loads.	40			200
F. Current Limit with I2t Shutdown (CL) – Sets the current		Percent of Range Setting
limit (overload), which limits the maximum current to the		Percent of Range Setting
limit (overload), which limits the maximum current to the		(Shown Factory Set to 160%)
motor. The current limit set point is established by the setting
of Jumper J3 and the setting of the CL trimpot. See Figure 22.

FIGURE 23 – I2t TRIP TIME vs MOTOR CURRENT

50
10
I2t TRIP TIME
(minutes)
				FACTORY CL
1.0				SETTING (160%)
1.0
0.1
110	120	130	140	150	160
		MOTOR CURRENT (%)

NOTES: 1. The CL set point is factory set to 160% of nominal motor current. 2. I2t Will not trip below 120% of the CL setting.

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.