Variable speed drive 75 kW, 400 V, IP20, Modbus

Variable speed drive 75 kW, 400 V, IP20, Modbus. A variable speed drive runs a motor at the speed the process needs. On fans and pumps, power falls with the cube of speed: at 80% speed a fan needs only about half the power. Replacing a throttling damper or valve with speed control is one of the quickest paybacks in a plant.

Key features

• Power: 75 kW / 400 V 3-phase
• Control: V/f and sensorless vector
• EMC: built-in C2/C3 filter
• Comms: Modbus RTU
• Enclosure: IP20 (IP54 cabinet option)
• Soft starting: no current inrush or mechanical shock at start
• Motor protection: overload, phase loss, over- and under-voltage, motor overheating

Typical uses

• Withering, dryer and boiler fans running on dampers
• Pumps throttled with valves
• Conveyors and mixers that need adjustable speed

Connecting to Plantmargin

Connect the drive's Modbus RTU port to the RS485 line; speed can also be set by 4–20 mA from the PLC. Plantmargin reads speed, power, current and run hours every 10 seconds through the edge gateway, stores it for years as hourly figures, draws it against its normal band, and uses it in cost per unit, alarms and verified savings. The installer pack for your plant lists the exact register or channel to use.

Installation

• Size the drive for the motor's rated current, not only its kW; this 75 kW drive suits a 75 kW 4-pole motor at normal duty.
• Use screened motor cable earthed at both ends, and keep it short; long cables need an output filter.
• In IP20 form the drive goes inside a ventilated panel; ask for the IP54 cabinet option for dusty or humid rooms.
• Many drives on one supply add harmonics: consider a detuned PF correction bank.

Before you order

• Send the motor nameplate (kW, voltage, current) and what the motor drives. For fans and pumps, Plantmargin can show the expected saving from your own data first.

Warranty and support

• Manufacturer's warranty, usually 12–24 months from delivery; the exact period is stated on your quotation.
• Supplied with the datasheet and manual; calibration or test certificate where the product has one.
• Installation, commissioning and connection to Plantmargin can be quoted with the product.