+358(0) 535-77-100

Request callback

Frequency converter 6-10 kV

  • Frequency converter 6-10 kV
  • Frequency converter 6-10 kV

COOLTECH frequency converters is a line of MV frequency converters (6/10 kV) meant for speed regulation of AC electric motors (synchronous and asynchronous) used in different industrial sectors for both individually and within a sequence-type control system of a group of the 2-10 units, of  200…20000 kW electric motors.  

COOLTECH high voltage frequency converters are built by the topology of an autonomous inverters and include a cascade of inverter cells and a copper secondary phase-shifting dry-type transformer.  

Highly functional COOLTECH drives are specially dedicated to meet Customers production and economical needs in the diverse mechanisms of oil and gas, oil processing, chemical and petrochemical industries, metallurgy, housing and utility sector, and other industrial sectors. Frequency converters enable minimisation of mounting, parameter setting and commissioning time.  A wide range of integrated functions reduces an amount of additional control electronic equipment, while an option for work with different industrial protocols enables the drive connection to most automation systems.    

  • Advantages
  • Application
  • Benefits
  • Technical data
  • Wide line of capacities
  • Scalar and vector control law
  • 2 years warranty from the delivery date
  • Developed considering the requirements and realities of industry
  • High performance and functionality
  • Low harmonic distortion of input and output voltage,
  • High power coefficient
  • Great regulation accuracy
  • Fast response to torque dynamic changes
  • High torque at low speed.
  • Refrigerating units (chillers)
  • Compressors
  • Pumps
  • Fans
  • Smoke exhausters
  • Mills, crusher, extruders.
  • etc.
  • electricity saving due to lower rotating speed of electric motors;
  • automatisation of the electric drive work and enabling parameter display on the operator’s workstation and remote control thereof;
  • protection of equipment from mechanical and hydraulic impacts during direct starts;
  • extending life of the equipment;
  • unlimited number of starts;
  • lower power supply;
  • self-testing (prior to start, a frequency converter tests the electric drive systems for readiness to run).



Control mode

Voltage/frequency control (U/f);
Sensor lessvector control(SVC), without encoder;
Vector control (VC), with encoder

Frequency resolution

0.1 %

Intput voltage and frequency range

3 ~ 6 000V ±10%; 50/60 Hz ± 5%
3 ~ 10 000V ±10%; 50/60 Hz ± 5%

Nominal power range

315 – 20 000 kW

Output voltage and frequency range

0 - Unom, 0-120 Hz (adjustable)

Current harmonic distortion

≤ 5%

Voltage/frequency curve (U/f)

Linear, quadratic, by selected values:voltage/frequency (U/f)

Overload capacity

120 sec at 120% nom.current;
5 sec at 150% nom.current;

Starting torque

Up to 200%

Rpm regulation range

1:50 (U/f) 
1:100 (SVC)

Steady speed accuracy

± 0.5%

Torque control accuracy

± 5%

Control power

380 V ±10%

Control panel

LCD touch panel, 10’’

Control inputs

16 digitalinputs, 
3 analogueinputs 0~20 mА,  
1 HF pulse input 0~50 kHz

Control outputs

20 relayoutputs, 
4 analogue outputs 0~20 mА,  
1 HF pulse output0~50 kHz


Setfrequency, outputcurrent, outputvoltage, input signal, feedback signal value, inverter cell temperature, output frequency, etc.


Saving of data on recentfail ure soccurredduring operation. Each error recordin cludes frequency, current, terminal out put/in put signal state during failure.

Frequency converter protection

Overcurrent, overvoltage, module failure protection, undervoltage, overheating, overload, protection against external faults, protection against memory errors, earth fault protection, phase-failu reprotection, etc.

Frequency converter alarms

Locking, overload alarm

Short term power loss

Less than 200 ms: continuous operation
More than 200 ms: automatic restart admitted

Ambient air temperature

-10°C ~ + 40°C (from +40 °Сto +50 °С
1.5% performance decrease per each degree)

Storage temperature

-20°C ~ + 65°C

Air humidity

No more than 90% (without condensate)


Lower than 1000 m, less than 5.9 m/s² (=0.6g)

Installation site

Free of aggressive and combustible gases, dust and other contaminations

FC protection class


Emergency stop

Frequency converter output power circuit immediate opening

Rpm control

Frequency converter starts running from loading ratecontrol

Integrated PID-control

Closed circuit system control process


Forced air cooling


Production of industrial gas compressor units, compressor units, chillers, pump circulating stations, air purgers, refrigeration and freezing systems of any complexity.

Aholanmäentie 88, 49630, Hamina, Vehkajoki, Finland
+358(0) 535-77-100