Control Techniques UNI3404VTC Unidrive Classic Inverter Unit

Module Feature

UNI3404VTC belongs to Unidrive Classic series AC drive manufactured by Control Techniques, VTC (Variable Torque) variant designed for centrifugal loads. Rated 30kW,60A continuous output current. It supports V/F,open-loop vector and closed-loop flux vector control,mainly used for induction motors. Equipped with 3 analog inputs,2 analog outputs,3 digital inputs,3 digital outputs. Expansion slots available for encoder feedback and fieldbus communication modules. Widely used in HVAC fans,water pumps and other centrifugal machinery.

Working principle

Three-phase 50/60Hz AC mains power is rectified to DC bus. IGBT power stage outputs adjustable voltage and frequency AC to regulate motor speed. Accepts analog or digital command signals. Encoder optional for closed-loop speed regulation. Built-in braking circuit absorbs regenerative energy during deceleration.

Onboard components

Input rectifier bridge,IGBT power module,main control PCB,LED status panel,dynamic braking transistor,heat sink,power terminal block,control I/O terminal block,option module connector.

LED indicators

Power LED,run status LED,fault alarm LED.

Hardware self-diagnosis

Overvoltage,undervoltage,overcurrent,overtemperature,output short circuit,earth fault,phase loss,motor overload,encoder signal loss detection.

Programming software

CTSoft software,supports motor auto-tune,real-time speed monitoring,fault log reading and parameter backup & restore.

Electrical & Process Parameters

Model:UNI3404VTC Brand:Control Techniques Device type:Unidrive Classic Variable Torque AC Inverter Power rating:30kW Output current:60A Input voltage:380 ~ 480VAC three phase Input frequency:50/60Hz Control mode:V/F,open-loop vector,closed-loop flux vector Feedback:Incremental,SinCos,SSI,resolver via option modules Cooling:Forced air cooling Protection:Over temperature,over current,over voltage,under voltage,short circuit,earth fault,phase loss,motor overload protection

Mechanical & Structure

Mounting:Panel mounting inside control cabinet Protection class:IP20 Housing:Metal frame housing

Environmental

Operating temperature:-10℃ ~ +40℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:20~80% non-condensing Certification:CE compliant Status: Control Techniques Unidrive Classic VTC inverter for fan and pump variable torque applications

Installation

Follow ESD safety procedure before handling.Mount vertically and reserve sufficient ventilation gap.Separate power cables and signal cables to reduce EMI interference.Connect three-phase mains to L1/L2/L3 terminals and motor cable to U/V/W terminals.Complete motor auto-tune and parameter commissioning before operation.

Interface

Main power terminal,motor output terminal,digital/analog I/O terminal,encoder connector,option module slots,keypad port.

Diagnostic

Over current:motor winding short circuit,cable damage or mechanical jam. Overheat:blocked heat sink or continuous overload. Encoder fault:loose wiring or encoder hardware damage. Under voltage:input mains fluctuation or phase missing. Unstable motor speed:incorrect motor parameters or poor shielding of signal wires.

Product Brief

Control Techniques UNI3404VTC Unidrive Classic VTC AC inverter,30kW,380-480V three phase input,variable torque design for fan and pump applications,supports open and closed loop vector control.