SKM20 Medium Voltage Inverter

SKM20 Medium Voltage Inverter

SKM20 medium voltage inverter, featuring long-term stable operation, precise control, easy maintenance, high efficiency, simple operation and more advantages, effectively improves the running performance of industrial motors, pumps, fans and etc. By using SKM20, it can bring you a lot of benefits such as decreasing system maintenance cost, increasing productivity and more.

User-friendly

SKM20 VFD is designed with intuitive user interface that it is easy to set parameters, check fault records and more.

Low harmonic distortion

Because of using phase-shifting rectifier transformers, SKM20 do not bring obvious harmonic distortion to power grid.

Data processing and control accuracy

SKM20 medium voltage inverter adopts the latest components such as TI DSP F28335 and ALTERA FPGA, SKM20 stands out from our competitors’ products with powerful processing capability and high control accuracy.

Control system

SKM20 medium voltage inverter is designed with simplified control system reduces the number of external components and failure points.

Anti-interference ability

Optical fiber communication and opto-isolator guarantees the full isolation between weak current and strong current what protects the system against interference.

Professional structure

SKM20 control system is composed of touch screen, programmable logic controller and mainboard serial structure, so it effectively reduces the data circulation, balances the data processing pressure of each module. As it adopts serial communication in data transmission, the anti-interference ability of the system has been greatly enhanced.

Safe to replace filter

SKM20 is designed with compact structure and professional layout. Its unique filter design allows replacing filter cotton safely during the running process.

Power factor compensation

Input power factor is higher than 0.97, with no need of power factor compensation equipment.

High working efficiency

The output current waveform is close to sine wave, harmonic distortion is less than 2%, output frequency is greater than 97.5%.

Stability

The fault diagnosis and protection function is complete so that the system can achieve long-term stable running.

Dual-power supply

Its control system is of dual-power supply what ensures the system do not lose power during the running status.

SUNKASTELL – SKM20 Medium Voltage Inverter

Serial number

Parameter name

Description

Type of data

Minimum

Max

Defaults

System parameters

Power sensor changes

Current Hall transformation ratio coefficient

Numerical

  

2000

Motor rated current

Nominal rated current of motor nameplate

Numerical

  

45A

V/F curve coefficient

Parabolic curvature, set according to load characteristics

Numerical

0

1

0.4

reset

When the system is shut down, the factory parameters can be restored to the default values. For example, the number 110 returns 1 to indicate that the parameters are restored successfully

Numerical

   

Torque boost

Torque boost during low frequency operation

Numerical

0

300V

100V

Start acceleration time

The time required for the inverter to accelerate from 0HZ to the corner frequency

Numerical

0

3200s

400s

Start acceleration time 2

The time required for the inverter to accelerate from the inflection point frequency to the rated frequency

Numerical

0

 

400s

Acceleration time corner frequency

Inflection point frequency of segmented acceleration

Numerical

0

50Hz

10Hz

Stop deceleration time

The time required for the inverter to decelerate from the rated frequency to stop

Numerical

0

3200s

400s

Current display filter duration

Current sampling filter time

Numerical

10

100

100ms

Current display filter duration

Current sampling filter time

Numerical

10

100

100ms

Operating parameters

Operating mode

1 means simulated operation, 0 means normal operation

Boolean

   

Frequency step

Acceleration and deceleration step length during jog frequency modulation

Numerical

0

50Hz

1Hz

 

Voltage display adjustment

Voltage display trimming coefficient

Numerical

0

1

1

Current display adjustment

Current display trimming coefficient

Numerical

0

50

0Hz

Sensor range setting

In closed-loop control, the sensor range used to collect feedback

Numerical

0

 

1MP

Whether the fault is transferred to power frequency

For the automatic bypass cabinet, if a fault occurs during the operation of the inverter, you can choose whether to automatically switch to power frequency operation

Boolean

0

1

0

Parking method

A value of 1 means free stop, a value of 0 means controlled stop

Boolean

0

1

0

Excitation time setting

High voltage, 380V reverse charging time

Numerical

0

60s

30s

Protection parameters

Overload duration 1

Overload protection delay time

Numerical

0

10s

0s

Overload threshold 1

Overload protection factor

Numerical

150

180

1.5

Overload duration 2

Overload protection delay time

Numerical

0

500s

180s

Overload threshold 2

Overload protection factor

Numerical

120

150

1.2

Overload duration 3

Overload protection delay time

Numerical

0

1000s

600s

Overload threshold 3

Overload protection factor

Numerical

110

120

1.1

Output overvoltage duration

System output overvoltage delay protection time

Numerical

0

100s

10s

Output overvoltage threshold

System output overvoltage protection coefficient

Numerical

0

130

1.3

Ud undervoltage threshold

Bus undervoltage coefficient

Numerical

  

0.76

Ud overvoltage threshold

Bus overvoltage coefficient

Numerical

  

1.35

PID parameters

Proportional gain

PID parameters

 

0

100

0.4

Integration time

PID parameters

 

0.01

10

0.1ms

Derivative time

PID parameters

 

0

10

0.0ms

Sampling time

PID parameters

 

0.01

100

0.1s

Speed function parameters

Speed enable

1 means speed is enabled, 0 means speed is forbidden

Boolean

  

0

Speed two-way enable

1 means reverse tracking is allowed, 0 means only forward tracking is allowed

Boolean

  

0

Voltage recovery time

The time it takes to recover to the voltage corresponding to the current frequency

Numerical

300ms

2000ms

2000ms

Tracking waiting time

Speed start delay time after stopping

Numerical

10s

25s

10s

Current action threshold

Rated current coefficient when flying car starts

Numerical

60

120

100

Frequency search speed

Down-frequency search time while flying

Numerical

300ms

2000ms

2000ms

Motor parameters

Motor model

Refer to motor nameplate

Character type

   

Rated current

Refer to motor nameplate

Numerical

   

Rated voltage

Refer to motor nameplate

Numerical

   

rated power

Refer to motor nameplate

Numerical

   

Rated frequency

Refer to motor nameplate

Numerical

   

Rated speed

Refer to motor nameplate

Numerical

   

Insulation class

Refer to motor nameplate

Numerical

   

Main winding method

Refer to motor nameplate

Character type

   

Motor pole number

Refer to motor nameplate

Numerical

   
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