UNI2402 Unidrive Classic

SKU: UNI2402 Category: Drive

Description
Additional information

The Control Techniques Unidrive Classic UNI2402 is a high-performance AC variable speed drive belonging to the Unidrive Classic series manufactured by Control Techniques. The UNI2402 is designed for precise open-loop and closed-loop vector control of AC induction motors, as well as servo motor control, making it a versatile solution for demanding motion control applications. This drive occupies a mid-range power rating within the Unidrive Classic family and is built to deliver reliable, high-dynamic performance in industrial environments.

The UNI2402 supports multiple control modes including open-loop vector, closed-loop flux vector, and servo control, allowing it to be adapted to a wide range of motor types and application requirements. It features an onboard RS-485 serial communications port and is compatible with a range of optional communication modules supporting protocols such as PROFIBUS-DP, DeviceNet, and CANopen. The drive includes comprehensive programmable I/O, an internal PID controller, and supports encoder feedback for closed-loop operation. Built-in EMC filtering options and a robust power stage contribute to reliable operation in electrically noisy industrial environments.

The Unidrive Classic UNI2402 is widely deployed in industries such as material handling, packaging machinery, printing, textile manufacturing, and general industrial automation. Its multi-mode control capability makes it suitable for applications requiring precise speed and torque regulation, such as conveyor systems, winding machines, extruders, and centrifuges. The drive's flexibility and programmability make it a preferred choice for OEMs and system integrators requiring a single platform across multiple machine types.

Technical Specifications

Series/Product Family	Unidrive Classic
Control Modes	Open-loop vector, closed-loop flux vector, servo
Input Voltage	380–480 V AC, 3-phase
Output Current (Continuous)	24 A
Power Rating	11 kW (at 400 V AC)
Switching Frequency	3–18 kHz (programmable)
Communication Interface	RS-485 serial; optional PROFIBUS-DP, DeviceNet, CANopen modules
Feedback Interface	Incremental encoder (quadrature), resolver (with option module)
Operating Temperature	0 °C to +40 °C (derate above 40 °C)
Storage Temperature	-40 °C to +50 °C
Relative Humidity	95% non-condensing
IP/Protection Rating	IP20
Mounting	Panel mount, DIN rail compatible
Certifications	CE, UL, cUL

Common Fault Codes

OV: DC bus overvoltage. The DC link voltage has exceeded the maximum threshold, typically caused by regenerative energy from the motor or high supply voltage.
Check supply voltage levels, verify braking resistor connection and rating, reduce deceleration ramp time or increase deceleration time parameter.
UV: DC bus undervoltage. The DC link voltage has fallen below the minimum operating threshold, indicating a supply interruption or low supply voltage.
Check AC supply voltage and connections. Verify that the supply is stable and within the specified input voltage range. Check for blown input fuses.
OI.AC: Output overcurrent (AC side). Instantaneous overcurrent detected on the drive output, often caused by a short circuit, motor fault, or excessively fast acceleration.
Check motor and output wiring for short circuits or earth faults. Increase acceleration ramp time. Verify motor parameters are correctly programmed.
OI.DC: DC bus overcurrent. Excessive current detected in the DC link, which may indicate a faulty power stage component or an abnormal load condition.
Inspect the drive power stage for damaged components. Check for motor winding faults. If fault persists after removing motor load, the drive may require repair.
OHt: Drive overtemperature. The heatsink temperature has exceeded the safe operating limit, caused by inadequate cooling, high ambient temperature, or excessive load.
Check that cooling fans are operational and airflow is unobstructed. Verify ambient temperature is within specification. Reduce load or increase deceleration time.
OL: Motor overload. The drive has detected that the motor is operating beyond its rated current for an extended period, triggering the thermal overload protection.
Reduce the mechanical load on the motor. Verify motor rated current is correctly entered in drive parameters. Check for mechanical binding or excessive friction in the driven load.
EEF: EEPROM fault. A checksum error has been detected in the drive's non-volatile memory, indicating corrupted parameter data.
Perform a factory reset to restore default parameters, then re-enter all application parameters. If the fault recurs, the drive control board may require replacement.
PH: Input phase loss. One or more phases of the AC supply have been lost or are significantly unbalanced.
Check all three input supply phases at the drive terminals. Inspect input fuses, contactors, and supply cabling. Verify supply phase balance.

Frequently Asked Questions

What is the power rating and output current of the UNI2402?

The UNI2402 is rated at 11 kW with a continuous output current of 24 A when operated from a 380–480 V AC three-phase supply.

What control modes does the Unidrive Classic UNI2402 support?

The UNI2402 supports open-loop vector control, closed-loop flux vector control, and servo control modes, making it compatible with AC induction motors and AC servo motors.

What communication protocols are supported by the UNI2402?

The drive includes a built-in RS-485 serial port. Additional fieldbus protocols including PROFIBUS-DP, DeviceNet, and CANopen are supported via optional plug-in communication modules.

Does the UNI2402 support encoder feedback?

Yes, the UNI2402 has an onboard incremental encoder input for closed-loop vector and servo control. Resolver feedback is supported via an optional interface module.

Is the Unidrive Classic UNI2402 still in production?

The Unidrive Classic series has been superseded by later Control Techniques platforms such as the Unidrive SP and Unidrive M. The UNI2402 is available as a refurbished or repaired unit through specialist industrial electronics suppliers.

Troubleshooting

Drive displays OV fault immediately on deceleration

The DC bus voltage is rising above the overvoltage threshold during motor deceleration due to regenerative energy being returned to the drive.

Connect or verify the braking resistor is correctly sized and wired to the drive's braking resistor terminals. Increase the deceleration ramp time in the drive parameters to reduce regenerative energy. Ensure the braking resistor value meets the minimum resistance specification for the UNI2402.

Drive trips on OI.AC at start-up or during acceleration

Check motor output terminals for short circuits or earth faults using an insulation resistance tester. Verify that the motor cable length does not exceed recommended limits and that motor parameters (rated voltage, current, frequency) are correctly programmed.

Repair any wiring faults found on the motor output. Increase the acceleration ramp time. If motor parameters are incorrect, perform an autotune routine to allow the drive to identify motor characteristics automatically.

Drive overheats and trips on OHt fault during normal operation

Inspect the drive's heatsink cooling fan for correct operation and check that ventilation clearances above and below the drive are maintained. Measure the ambient temperature inside the control cabinet.

Clean or replace the cooling fan if it is not running. Ensure minimum ventilation clearances are observed as specified in the Unidrive Classic installation guide. If ambient temperature exceeds 40 °C, derate the drive output current accordingly or improve cabinet cooling.

EEF fault appears after power cycling and drive will not run

The drive's internal EEPROM has detected a parameter memory checksum error, which may have been caused by a power interruption during a parameter save operation or by component degradation.

Perform a full factory reset by entering the reset code in the appropriate parameter (refer to the Unidrive Classic parameter reference manual). Re-enter all application-specific parameters after the reset. If the EEF fault recurs repeatedly, the control board requires replacement or professional repair.

Drive runs but motor speed is unstable or oscillating in closed-loop mode

Verify encoder wiring integrity, including shielding and correct connection of A, B, and Z channels. Check that the encoder pulses-per-revolution setting in the drive parameters matches the actual encoder specification. Inspect for electrical noise on the encoder cable.

Re-terminate encoder cable shield at the drive end only. Correct the encoder PPR parameter if it is set incorrectly. Adjust the speed loop proportional and integral gain parameters to stabilise the control response. Route encoder cables away from power cables.

Condition	Repair, Used, Refurbished, New in box (sealed)