Bonfiglioli BN 90 LA 4 3-Phase Gearmotor 1.5kW i=14.1
The Bonfiglioli BN 90 LA 4 3-Phase Gearmotor is an integrated drive assembly intended for compatible industrial applications. The BN 90 LA 4 value identifies the motor frame, the LA variant, and the four pole configuration. The unit is associated with a 1.5 kW rating at 50 Hz, an output speed of approximately 100 RPM, and a ratio of i=14.1.
The relationship between the motor speed and the output speed is worth noting. A four pole motor at 50 Hz runs at about 1400 to 1450 RPM, and a ratio of about 14 reduces that to roughly 100 RPM. This confirms that the motor and the gearbox are matched as a pair, and the output speed should be used when the machine requirement is checked.
Motor Section
The BN 90 LA 4 motor converts electrical energy into rotary motion. The frame 90 designation defines the mechanical interface, the shaft dimensions, and the approximate power range. The LA variant and the four pole configuration are described on the nameplate, which supplies the rated voltage, frequency, current, speed, and connection method.
The 1.5 kW rating at 50 Hz places the motor in a common industrial class. The motor should be applied within its rated conditions and protected against overload. Misalignment, excessive vibration, and incorrect voltage can affect bearings, windings, and insulation.
Gearbox Section and Ratio
The gearbox reduces the motor speed and increases the output torque according to the i=14.1 ratio. The user should confirm the output speed, the output torque, and the permissible overhung loads against the machine requirement. The output speed of about 100 RPM is a useful check value during commissioning.
The gearbox should not be exposed to loads beyond its specified capacity. Shock loads, misalignment, and excessive overhung loads can affect bearings, gears, and seals. The machine design should provide adequate support for the gearmotor and for the connected shafts.
Mechanical Installation
The assembly should be mounted on a rigid structure that can support its weight and torque. The mounting surface should be clean and flat, and the fasteners should be tightened to the specified values. The assembly should not be distorted by uneven mounting surfaces or excessive bolt force.
Shaft alignment should be checked carefully. Couplings should be aligned within the limits allowed by the assembly design. Belt, chain, or gear connections should follow the machine design and the product documentation. Guards should be fitted where rotating parts are accessible.
Lubrication and Sealing
Lubrication is essential for reliable gear operation. The correct lubricant type and quantity depend on the gearbox size, the mounting position, and the operating conditions. The user should follow the product documentation for lubricant selection and service intervals.
Seals protect the lubricant and exclude contamination. During inspection, the user should check for leakage around shafts and joints. Oil stains may indicate seal wear or loose connections.
Electrical Connection
Electrical connection should be performed by qualified personnel following the site electrical code. Supply voltage, frequency, and winding connection must match the motor nameplate. Terminal connections should be correct and secure. Protective earth should be connected according to the installation requirements.
Cable sizes should be selected for current and voltage drop. Cable entries and glands should maintain the enclosure protection. The motor should be protected against short circuit and overload.
Commissioning
Commissioning should begin with a mechanical and electrical inspection. The assembly should be uncoupled from the load where practical for a direction check. The user should observe current, speed, vibration, and noise.
The direction of rotation should be confirmed. The output speed should be checked against the expected value for the i=14.1 ratio. The driven machine should be checked for smooth operation. Commissioning records should include the motor reference, the gearbox reference, the ratio, the mounting position, and the test results.
Thermal Behaviour
The assembly should be installed in an environment that matches its protection and cooling requirements. Ambient temperature, ventilation, and heat from nearby equipment affect operating temperature. The assembly should not be covered by materials that prevent heat dissipation.
If the application includes high duty cycles or low output speed operation, the thermal margin should be reviewed.
Diagnostics and Maintenance
If the assembly runs noisily, the user should check alignment, mounting, lubrication, bearings, and load conditions. If it overheats, the load, duty cycle, ambient temperature, ventilation, and electrical data should be reviewed.
Routine maintenance should include checking for leakage, noise, vibration, loose fasteners, and cable condition. The lubricant should be inspected and changed according to the service plan. Maintenance work should be performed with the machine isolated and secured.
Application Value
The BN 90 LA 4 gearmotor supports speed reduction and torque transmission in compatible machinery at the 1.5 kW class with a 100 RPM output. It can be applied in conveyor, mixing, packaging, and other industrial drive arrangements where an i=14.1 ratio fits the design.
Summary
The Bonfiglioli BN 90 LA 4 3-Phase Gearmotor is intended for compatible industrial drive applications. Correct nameplate verification, mounting, alignment, lubrication, electrical connection, commissioning, and maintenance are essential.
