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Frequency converter for speed adjustment of DS asynchronous motors 0.18 to 4.0 kW 200 to 240 V, 1~, 3~ 200 to 240 V, 1~, 3~

BLEMO frequency converter



The basic frequency inverter of
BLEMO - a vector controlled
Range of devices from 0.18 to 4.0 kW


The ER12 is the successor of the successful ER11 frequency inverter series. Based on the proven functions and excellent quality, the ER12 has been further developed, improved and thus adapted to new market requirements. With the pre-programmed factory software, the devices can be put into operation immediately in 95% of all applications.

Device versions

The ER12 in protection class IP20 is available in two housing versions ER12-...K with heat sink and ER12-...B with base plate and reduced height. The suffix U designates the US version with a mains voltage of 1~ 100...120 V.

Standard features

  • 4-digit 7-segment display
  • 4 preprogrammed application macros
  • Lacquered circuit boards
  • Low leakage current up to 0.75 kW < 3.5 mA
  • Output frequency 0...400 Hz
  • Navigation wheel for programming and
  • as setpoint potentiometer
  • Local controls with keys
  • Analog output
  • built-in PID controller
  • Modbus via RJ 45, RS 485
  • integrated EMC filter (type K and B),
  • Class C1
  • RoHs, WEEE compliant
  • Field buses: Modbus integrated
  • CE, UL, CSA, NOM, C-Tick, GOST

Functional enhancements

In order to open up new applications, numerous functions in the ER12 have been expanded and completely new ones created. A navigation wheel, which can also be used as a setpoint potentiometer, has been newly installed. Also a local control with keys and an analog output. The units are low leakage current up to 0.75 kW < 3.5 mA. The output frequency has been increased to 400 Hz and the units can be operated up to 50°C without declassification. Painted circuit boards and Modbus are standard. The power stages 3.0 and 4.0 kW were added.

Compliance with EMC requirements

The ER12 series frequency inverters ( Type K and B) have a class C1 line filter integrated in the device, are CE marked in accordance with the EU Low Voltage and EMC Directive and comply with the applicable product standard for frequency inverters EN 61800-3.

Application areas

  • Conveying technology
  • Pumps and fans
  • Mechanical and plant engineering

Your benefits

  • Very compact dimensions
  • Motor control both via the classic V/f characteristic curve and via sensorless vector control or pump/fan characteristic curve
  • Can be configured without voltage, even in the packaging
  • "Plug and Drive" - a standard application runs without settings

Questions about the product

Guidelines for the operation of frequency converters

  1. To achieve electromagnetic compatibility, the inverter must be operated with a built-in or external radio interference filter.

  2. If shielded cables are used between the inverter and the motor, the shield must be connected to earth at both ends. Cable interruptions should be avoided if possible. If it is necessary to separate the cable, e.g. to install a motor contactor, the cable shielding must be connected through as directly as possible. It is important to ensure that the lowest possible HF impedance is achieved.

  3. The shorter the cable, the lower the radio interference and leakage current. The maximum possible cable lengths must be taken into account.

  4. To avoid interference with the control inputs, control cables should always be shielded. The shield must be connected to the cable clamp provided on the inverter. If the shield is also connected to a control device, care must be taken to ensure that the ground points have the same potential.

  5. Control cables should not cross power cables if possible. Where this cannot be avoided, a right-angled crossing is recommended.

  6. Separate laying of control and power cables should be aimed for. If the cables must be laid parallel, e.g. on the same cable route, the largest possible distance (> 20 cm) should be selected.

  7. The shielding of the laid cables should have a low HF impedance if possible. Copper braiding is therefore preferable to steel braiding.

  8. The RF contact resistance at the connection points between shielding and housing must be kept as low as possible. Dirt, paint and insulation residues on the housing and shielding in the area of the connections must therefore be removed. In principle, the cable clamps or crimp connections provided for this purpose should be used to connect the shielding. It is advantageous to use earthing cable glands.

  9. The shielding should be connected to the housing as close as possible to the cable terminals. Longer, free cable ends act as antennas.

  10. With unscreened cables, the cable wires should be twisted and output filters should be used.

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