Lovato VLB107A240XX 0.75 kW VLB1 Drive Power Unit

0.75 kW VLB1 power unit without keypad for single-phase supply

Variable speed from a single-phase supply is what the VLB107A240XX (VLB1 series, 0.75 kW, 4.2 A) provides; input 200-240VAC 50/60Hz, output 0-599 Hz. It lets a squirrel-cage motor accelerate and run at controlled speed.

Overload capacity is 150% for 60s; 200% for 3s, with a switching frequency of 2-16kHz.

This code is the power-unit version: it has no integrated keypad, so a keypad or configuration tool is selected separately to commission it. Confirm the control interface you need before ordering.

Technical specifications

Sizing and selection

With 4.2 A available at the output, motors up to about 0.75 kW fit, but always confirm by nameplate current and duty (the overload figure is 150% for 60s; 200% for 3s). A mains choke reduces the input current figure of 10 A and is a common choice on weak supplies.

Control modes listed: V/f linear, V/f quadratic, V/f multipoint, sensorless vector control, ECO mode, servo control with encoder feedback, torque setpoint, sensorless control for synchronous motors.

A brake chopper is built in and the safe-torque-off function is optional.

Applications and installation

Use cases range from single booster pumps to packaging-line conveyors and fan walls. Check the motor control modes listed below and the maximum motor cable length table, because both depend on the type of motor and cable installed.

Installation data: 60 x 214 x 130 mm, 1 Kg, IP20. Vertical mounting is required; allow airflow above and below the unit and observe the altitude derating stated in the table.

Commissioning the VLB1 power unit on a single-phase supply

Since the VLB107A240XX arrives without an integrated keypad, plan the commissioning method before the drive reaches site, so that the technician has the configuration tool or keypad ready on the day. Start by checking that the incoming single-phase supply sits within the stated operating range and that the earth connection is sound. Enter the motor nameplate data, run the autotuning routine where the chosen control mode benefits from it, and set acceleration and deceleration ramps that suit the driven machine rather than leaving factory values in place.

Test the digital inputs, the relay output and any analog signals against the control system before handing over. If the multi-pump PID function is used on a booster set, confirm the staging logic with the actual pumps and pressure transmitter, and save the final parameter set so it can be restored if the unit is ever replaced.

Panel layout and wiring practice

Keep the motor cable as short as the layout allows and run it apart from signal and control cables. Use a screened motor cable where the EMC category matters, and terminate the screen correctly at both ends according to the manufacturer’s guidance. If a braking resistor is connected to the built-in brake chopper, mount it where its heat cannot affect the drive or other panel components.

Heat, dust and humidity in Omani installations

The current derating above 45 °C becomes relevant quickly in GCC summers, particularly in small enclosures on rooftops or pump stations without air conditioning. Estimate the internal panel temperature, consider a lower switching frequency where motor noise is acceptable, and provide filtered ventilation or cooling as needed. An IP20 drive must be protected by its enclosure against fine sand and dust, which can block airflow paths, and against condensation in humid coastal areas.

Maintenance routine

With the supply isolated and after the waiting time stated in the documentation, inspect for dust build-up, clean or replace enclosure filters, check terminal tightness and review the fault history for recurring trips. Recurrent overcurrent or overvoltage events usually point to ramp settings, the load or the supply rather than the drive itself.

Documents and quotation

The Lovato Electric datasheet for VLB107A240XX (English, exported from the manufacturer’s online catalogue) is attached and is the source of the figures above. Please confirm the motor nameplate current, the supply type and voltage, the EMC category needed for your cable lengths and whether a keypad or safe-torque-off option is required before you order, and note that the manufacturer may revise datasheet values. Related items are listed under ac drives. To request VLB107A240XX, send the quantity and delivery location with the quotation form; Seven Star LLC is an independent supplier based in Muscat.