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Frequency converter for speed adjustment of asynchronous motors 0.25 to 7.5 kW, 200 to 480 V, 1~ and 3~

BLEMO frequency converter



The very easy frequency converter
from BLEMO - for all applications
with asynchronous motors 

Component parts
Component parts


The ER804 is based on the fundamental characteristics of our first ER drive from 1993, but in order to achieve the energy efficiency required by the ErP directive, it is increasingly necessary to equip even the simplest applications with drives. When developing the ER804, special attention was therefore paid to simple operation.


Due to the out-of-the-box commissioning, parameterization is no longer necessary. Optionally, the user can choose between the plug-on analogue operating unit ABE and the digital operating unit DBE, as well as software and the Simple-Loader.

Device version

The ER804 is available in two sizes in the power range 0.25 kW to 7.5 kW. The unit can be snapped onto a DIN rail and can be mounted side by side, vertically or horizontally.

Your benefits

  • Quick assembly, error-free installation
  • Commissioning Out-Of-The-Box
  • No special FU knowledge necessary
  • Integrated motor protection and short circuit protection
  • Space savings through side-by-side mounting and horizontal mounting
  • Simple parameterization with screwdriver via option


Compliance with directives and standards

The ER804 series frequency inverters have an integrated class C1 mains filter and are CE marked in accordance with the EU low voltage EMC directive. They comply with the applicable product standard for frequency inverters EN61800-3.

Standard Features

  • Integrated are Modbus, CANopen, Ethernet optional
  • Integrated EMC filter
  • PTC thermistor input PTC
  • Output frequency 0...300 Hz
  • Overload capacity 1.5 x rated capacity
  • Fire-mode, skip frequencies
  • Adjustable clock frequency up to 32 kHz
  • RoHS, WEEE compliant (recycling rate 88%)
  • CE, UL, cUL, cTick, EAC, RoHS
  • Lacquered circuit boards

Application areas

  • Pumps and fans
  • Building services engineering HKL
  • Mechanical and plant engineering
  • Conveying technology


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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