Lovato VLB30007A480 0.75 kW VLB3 Variable Speed Drive

0.75 kW VLB3 variable speed drive for three-phase supply

VLB30007A480 is a VLB3 variable speed drive: 0.75 kW (1 (heavy load) HP), 2.4 A continuous output, three-phase input at 400-480VAC 50/60Hz. The output frequency range is 0-599 Hz, which covers standard 50 and 60 Hz motors and higher-speed spindles.

Radio-frequency interference is handled by the built-in EMC suppressor cat. C1/C2 inside the housing, and the serial port is RS485, Modbus-RTU.

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

Technical specifications

Sizing and selection

For a motor whose nameplate current is at or below 2.4 A, this rating is the right size. The supply must be 400-480VAC 50/60Hz; the datasheet lists 3.3 A input current without a choke for protective-device sizing.

Control modes listed: V/f linear, quadratic torque, sensorless vector control, ECO mode, servo control with encoder feedback, multipoint V/f curve, V/f closed loop control with encoder feedback, torque setpoint, sensorless.

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

Applications and installation

Common applications include booster and circulation pumps, ventilation fans, conveyors and small process machines. On long motor cables an output filter or a different EMC category may be needed; the datasheet table of maximum cable length by category is the reference.

Dimensions of 60 x 214 x 130 mm and a mass of 1.1 Kg make this a panel-friendly size. Protection is IP20, so place it in an enclosure suited to the environment and keep motor and control cables separated.

Key features that set the VLB3 apart

• Wide choice of control modes: from simple linear or quadratic V/f to sensorless vector and encoder-based closed loop, so the same drive model can serve a fan today and a positioning conveyor tomorrow.
• Built-in brake chopper: with an external braking resistor, the drive can dissipate regenerative energy from high-inertia or overhauling loads instead of tripping on overvoltage.
• Integrated C1/C2 EMC suppressor: reduces conducted emissions without a separate filter box in most panel layouts.
• RS485 Modbus-RTU as standard: start, stop, speed reference and diagnostics can be handled over two wires from a PLC or SCADA system.
• Tolerant input range: operation from 340 to 528 VAC and 45 to 65 Hz accommodates weak networks and generator supplies.

Mains choke: when it is worth adding

The data shows input current falling from 3.3 A without a mains choke to 2.6 A with one. That reduction reflects lower harmonic current drawn from the supply. A choke is worth considering where many drives share one transformer, where the supply is a generator, or where the network is known to carry voltage spikes; it also tends to extend the life of the drive’s DC-link capacitors. On a small single installation with a stiff supply it is often optional.

Commissioning tips

Enter the motor nameplate data first, then choose the control mode that suits the load: quadratic torque or ECO mode for pumps and fans, sensorless vector where good torque is needed at low speed. Set acceleration and deceleration ramps to match the mechanics; if short stopping times are required, size and connect a braking resistor to the chopper terminals. Configure the speed reference source, whether a 0-10 V signal, 4-20 mA loop, keypad or Modbus, and test the stop function before handing over the machine.

Switching frequency and motor noise

A higher carrier frequency within the 2-16 kHz range makes the motor quieter, but increases losses in the drive and can increase leakage current through long motor cables. The 32 W loss value is quoted at 4 kHz; if a higher setting is used, check the derating curves in the Lovato manual, especially in a warm cabinet.

Considerations for GCC installations

Water treatment plants, HVAC systems and small industrial lines in Oman and the wider Gulf often place drives in enclosures that see high summer temperatures. Allow for ventilation or panel cooling, keep the heat sink clean of dust, and confirm the cabinet temperature stays within the drive’s rated range. Where long motor cables run to submersible or remote pumps, an output filter may be needed to protect motor insulation.

Details to include in a quotation request

• Order code VLB30007A480 and the quantity required.
• Optional items: mains choke, braking resistor, remote keypad or communication modules.
• Motor data and type of load, if you want the size confirmed.
• Delivery location and required date.

Documents and quotation

A copy of the manufacturer’s datasheet for VLB30007A480, exported from the Lovato Electric catalogue in English, is attached to this page; every figure in the table comes from it. Ordering checklist: 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. Data in the datasheet is subject to change by the manufacturer. For related parts browse ac drives. Send the order code VLB30007A480, the quantity and the delivery location through the quotation form and Seven Star LLC, an independent supplier in Muscat, will reply with availability.