B.The hi-pot tester must have an automatic ramp-up to the test voltage and an automatic ramp-down to zero voltage.

Note: If the hi-pot tester does not have automatic ramping, then the hi-pot output must be manually increased to the test voltage and then manually reduced to zero. This pro- cedure must be followed for each machine to be tested. A suggested hi-pot tester is Slaughter Model 2550.

WARNING! Instantaneously applying the hi-pot voltage will cause irreversible dam-

!age to the speed control.

C.The hi-pot test voltage should be set in accordance to the testing agency standards and the leakage current should be set as low as possible without causing nuisance trips.

D.To eliminate motor speed control damage due to auxiliary equipment hi-pot failure, it is also recommended that all signal inputs be wired together and connected to the AC input lines as shown.

FIGURE 16 – HI-POT SETUP

HIGH VOLTAGE DIELECTRIC WITHSTAND TESTER

 

 

 

 

(HI-POT TESTER)

 

 

 

 

 

 

1

2

 

 

 

LEAKAGE

0

3

 

 

 

 

 

AC KILOVOLTS

 

 

 

0mA

10mA

 

 

 

 

 

RETURN

TEST

VOLTAGE

 

 

 

H. V.

RESET

 

 

 

 

CONNECT ALL SPEED CONTROL

 

 

 

 

 

 

 

 

ZERO

MAX

 

 

TERMINALS TOGETHER

 

 

 

 

(MAIN POWER DISCONNECTED)

 

 

 

 

 

 

 

 

 

 

MOTOR SPEED CONTROL

AC LINE INPUT

 

 

 

 

 

 

 

 

 

 

L1

 

 

 

 

 

 

L2

MOTOR

MOTOR WIRES

 

 

 

 

TERMINALS

CONNECT HI-POT

 

 

 

 

 

 

 

 

 

TO BOTH

 

 

 

 

FRAME

AC LINE INPUTS

AUXILIARY EQUIPMENT

 

 

SIGNAL INPUTS

 

 

 

 

 

 

 

 

L1

 

P1

 

 

 

 

L2

 

P2

 

 

 

 

 

CHASSIS

P3

 

CHASSIS

 

 

MACHINE OR EQUIPMENT FRAME

 

 

VI. CONTROL OPERATION

 

 

 

 

A.Start-Up Procedure – After the control has been properly setup (jumpers and trimpots set to desired positions and wiring completed), the startup procedure can begin. If the AC power has been properly brought to the control, the POWER LED will be illuminated green once the Power On/Off Switch is set to the “ON” position. The STATUS LED will indicate control status as described in Section IX, on page 13. To start the control, momentarily set the Start/Stop Switch to the "START" position. The motor will begin to accelerate to the set speed.

Note: If the motor rotates in the incorrect direction, it will be necessary to disconnect the AC line, reverse any two motor leads, and repeat the startup procedure.

B.Fault Recovery – The control has four fault states – undervoltage, overvoltage, short cir- cuit at the motor (phase-to-phase) and I2t overload protection. To recover from any fault, it is necessary to momentarily set the Start/Stop Switch to the "START" position.

If the Start/Stop function has been eliminated by installing a jumper between RUN and COM terminals, then it will be necessary to either disconnect the AC line until the STA- TUS LED indicates an undervoltage fault (approximately 20 seconds) or use the Start/Stop Switch (if installed).

9

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Baldor MN781W manual HI-POT Setup, VI. Control Operation
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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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