UNIFREM 230 M is the 230 V single-phase variant of the compact UNIFREM 400 M family. It is designed for drives with single-phase 1 × 230 V supply and three-phase output for both induction and synchronous motors rated up to 2.2 kW. The drive offers simple setup via the UNIPANEL graphic panel, efficiency above 98 % and the same compact mechanics as the UNIFREM 400 M range.

Typical applications: auxiliary drives in mining locomotives (powered from a 300 V DC trolley line - compressors, pumps, fans), small machines, OEM equipment and any application where a three-phase 3 × 400 V supply is not available and only single-phase 1 × 230 V mains or a DC link is at hand.

All drives are also available in VF version - for high-speed or special motors up to 3000Hz. UNIFREM VF converters allow independent setting of both output voltage and output frequency.

Key advantages

High fault resistance

Built-in protections against overvoltage, undervoltage, short circuits, earth faults and thermal overload. The power stage is designed for long service life.

Minimal impact on the grid

Three-phase input commutation chokes and EMC filters ensure low harmonic distortion per EN 61800-3 and EN 61000-6-4.

Minimal losses

Modern Mitsubishi and Semikron power modules deliver high efficiency. Optimised switching frequencies reduce losses of both converter and motor.

Advanced vector control

Speed, torque and position vector control for both induction and synchronous motors. High-quality scalar V/f control for standard applications.

Rich software feature set

AI-based features, built-in PLC functions, a wide range of communication interfaces and intuitive setup via the UNIPANEL graphic display.

Compact dimensions

UNIFREM 400 is designed to fit into space-constrained cabinets without compromising rated performance or cooling.

Features and advantages of UNIFREM

High resistance against fault propagation

UNIFREM 230 M converters include protection against overvoltage, undervoltage, current overloading of converter, short circuit between input phases and overheating. Input and output phase loss are detected as well. Overheating of motor is suppressed by calculating the heat integral of the motor.

Minimal disturbance to the supply power grid

Three phase input commutation chokes (optional) are lowering the harmonic distortion (EN 61800–3). Use of noise suppressing filters ensures minimal disturbance to the power grid (EN 61000–6-4).

Minimal losses – „lossless“ converter

Use of the newest power electronics has lowered and minimalized converter losses and power grid disturbance.

Smaller dimensions

By the use of power optimized heat sink together with improved heat-transfer-targeted placement of power components smaller dimensions have been achieved.

High reliability

The latest generation power capacitors with extended operating temperature and lifetime by 20% as well as the newest power electronics components have been used. The cooling fans with high-quality bearings ensure longer lifetime and lower noise level.

High performance vector control ( sensorless or with mechanical sensor ) of both induction and synchronous motors.

Designed for applications with requirements for very accurate speed control and high dynamic performance. Automatic online tuning of the motor parameters (stator resistance, magnetic saturation... ).

Speed, Torque and Position control

Designed for high-demanding applications with induction and synchronous motors, with high requirements for precise torque and speed control - traction drives, reelers... Position control with sampling period of 200 µs allows precise control of highly sophisticated applications.

Scalar V/f control with automatic V/f curve and slip compensation

Our unique scalar control is targeted for applications with requirements to keep the speed constant and robust control without need for excellent dynamic response.

Rich software features

Interactive communication with converter using Unipanel
Hierarchical structure of parameters allows easier configuration and being aware of mutual dependencies among various parameters
Same possibilities of configuration and control by different methods (SPI, UNIPANEL, CANopen...)
Different access levels (basic, service)
Unified handling and independence of communication protocols (USB, RS485, CAN)
Universally programmable and combinable logical blocks (AND, OR, NAND, NOR, XOR, RS flip-flop) – built-in PLC.
Independent and fully configurable process PID controller, optimization
Kinetic backup, ride-through capabilities for short supply power failures
Flying start
3 brake modes
Programmable universal optimization (for example: minimization of power, maximization of torque... )
Process PID controller (various action variables, rich configuration possibilities)
Universal and fully configurable system of inputs and outputs
Crane control functions (Overload protection system, dynamic lift-up)
4 independent parameter sets, switchable on-the-run
User macros - preset configurations:
- for catalog types of motors
- for standard schemas of control (manual control, binary, up-down commands, PID regulation, etc)
- for control basic kinds of load ( pump, fan, conveyor/travel, heavy load, crane lift)

Communication with other systems

Support of following industrial communication protocols: CANopen, MODBUS, PROFIBUS.

Events and faults history

Configurable history of faults, warnings and other events. Stores up to 1000 events.

VONSCH Drive Studio

Application for configuration, diagnostics and archiving of settings to PC. It allows: firmware upgrade, process diagnostic "black box" data. Diagnostics of faults and events helps the operator to solve the problems and avoid the future ones.

Standard equipment:

Noise suppressing filter

Eliminates disturbances to the power grid (EN 61000–6-4)

Brake module

Electronics for brake resistor control used in generator mode of operation

Options:

Three phase commutation choke KT1

Minimization of harmonic currents from the power grid. (EN 61800–3)

Motor (output) choke MT1

Output motor chokes are used in case when the distance between the converter and the motor is higher than 100m (non-shielded cable) or 50m (shielded cable). Cable capacitance effects are eliminated by the motor choke or sine filter.

Brake resistor BO1

Ensures dissipation of kinetic energy in the regenerative mode of motor operation.

Sine filter SF1

Sine filter filters the output PWM voltage of the inverter to the sine wave of variable frequency and amplitude. This will limit the peak current and capacitive motor insulation stress. When using the EMC sinus filter, it is not necessary to use the shielded cable. It is necessary to set the switching frequency of IGBT power elements to at least 4 kHz, when using the Sine filter!

Manual control panel - UNIPANEL

UNIPANEL is universal handheld control device for the whole latest generation of VONSCH products (UNIFREM, MVE CONTROL, FOTO CONTROL, PV COMP, GSE COMP, QUATROFREM... ). Panel may be assembled directly to the enclosure or may be connected by wire (max. length is 100m). UNIPANEL uses CANopen as its primary communication protocol with the inverter. Maximal number of 99 devices may be connected to UNIPANEL. User can choose which device (inverter,controlled rectifier, other product) will be controlled and monitored. USB port serves as communication port with PC. UNIPANEL does not serve only as monitoring and configuration device, but as backup&restore manager too. Fully graphical display shows the description and brief help to all the parameters. All the parameters and variables may be monitored in real-time and plotted into the graph.

Extension modules:

Extension module RM-UNI_IRC1

Extension module RM-UNI_M_IRC1 for the UNIFREM main board. Incremental encoder (IRC) is connected to the terminal marked on the IRC module. It is used for speed, torque or position closed loop vector control. To connect to the module push-pull rotary encoder incremental encoder HTL with 24Vdc power supply is used. Extension module contains special circuits to detect and evaluate some errors such as faulty electrical signals or disconnected encoder from the rotor.

Extension module RM-RDC

Extension module RM-RDC for the connection of resolver to the UNIFREM main board. The sensor is connected to the terminal marked on the module. It is used for speed, torque or position closed loop vector control of both, synchronous and induction motors. Extension module includes special circuits to detect and evaluate some errors such as faulty electrical signals or disconnected encoder from the motor shaft.

Profibus DP extension module

Profibus_UNI extension module is used for connection of the converter to PROFIBUS DP network. Profibus DP (Decentralized Peripherals) is the simple and most widely used version of Profibus designed for fast master - slave communication. Communication medium is twisted pair (RS-485 standard).

Technical data

Type of the converter	M ~ constant load				Nominal input current of the converter I_NIN [A]
Type of the converter	Motor output rating P_NOM [kW]	Nominal output current of the converter I_NK [A]	Nominal output current of the converter I_NK60 [A]	Nominal output current of the converter I_NK2 [A]	Nominal input current of the converter I_NIN [A]
UNIFREM 230 000M	0.75	3.9	5.85	7.8	5.8
UNIFREM 230 001M	1.1	5.4	8.1	10.8	7.8
UNIFREM 230 002M	1.5	7.4	11	14.7	11.2
UNIFREM 230 003M	2.2	10.5	15.75	21	14

Power and current:
Nominal input current of the converter I_NIN [A] : effective input current of the converter
Nom. output current of the converter:: nominal and maximal permanent output current of the converter
Motor power: recommended maximal power of a motor connectable to the output of the converter
For constant load:

I_NK	- nominal output current of the converter for constant load
I_NK60	- maximal output current of the converter that is equalled 1.5 x InK for the duration of 60 s each 10 min
I_NK2	- maximal output current of the converter that is equalled 2 x InK for the duration of 2 each 15 s

For lower power 1 × 230 V single-phase drives (economy range) see UNIFREM 230 E. For the three-phase 3 × 400 V version with higher ratings up to 11 kW visit UNIFREM 400 M.

Typical applications

Dimensions

Type of the converter	height [mm]	width[mm]	depth [mm] (without control panel)	depth [mm] (with control panel)
UNIFREM 230 000M ÷ 003M	300	130	151.5	186.5

Weight

Type of the converter	weight [kg]
UNIFREM 230 000M ÷ 003M	4.2

General technical data

Input voltage range:	1 × 230 V ±10 % (50/60 Hz), or DC link 220 - 420 V (special applications, e.g. mining traction powered from a 300 V DC trolley line)
Input frequency:	47 to 63 Hz
Output voltage range:	3 x 0 to 100% of input voltage
Output frequency:	0 ÷ 500 Hz
Efficiency of the converter:	more than 98.1 %
Analog inputs:	2 programmable analog inputs (Options: 0 ÷ 20 mA , 4 ÷ 20 mA , 0 ÷ 10 V , 2 ÷ 10 V)
Digital inputs:	6 digital programmable inputs 1 digital safety input EN 13849-1 class 3 software adjusted control voltage ( + 24 V or 0 V )
Digital outputs:	2 programmable relay outputs
Analog outputs:	2 analog programmable outputs 0 ÷ 20 mA or 4 ÷ 20 mA
Starting motor torque:	to 200 % Tn (according to the type of motor)
Electronic protection against:	overcurrent, overvoltage, undervoltage, short circuit protection, ground fault protection, converter overtemperature, motor overtemperature
Cooling:	forced air cooling by built-in fan
Electromagnetic compatibility (EMC):	Built-in RFI filter to industrial environment according to EN 61000-6-4
Elimination of higher harmonic components of voltages and currents	external three phase choke lowers harmonic currents, extends lifetime of power capacitors, protects converter against voltage peaks
Permissible ambient temperature during operation:	+1 °C to +40 °C (EN 50178), optional (special version) -10 °C to + 40 °C
Relative air humidity:	≤ 90 % without corrosive and explosive gases, without water vapor and condensates
Degree of protection:	IP20, IP55 possible in enclosure-based modification

UNIFREM 230 M