Frequency inverter ER804

The most important advantages:

- Quick assembly
- Error free installation
- Integrated motor protection


The easy to use frequency inverter by BLEMO® - for all applications with asynchronous motors.


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

ER804 – compact format


The ER804 is based on the fundamental features of our first frequency inverter ER from 1993. In order to achieve the energy efficiency required by the ErP Directive, it is becoming increasingly necessary to equip even the simplest applications with frequency inverters. During the development of the ER804, special attention was therefore paid to the simple handling of the operation.


Due to the out-of-the-box commissioning, parameterization is no longer required. 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 device can be snapped onto a top-hat rail and can be mounted side by side, vertically and also horizontally.

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
– Output frequency 0…300 Hz
– Overload capacity 1.5 x Inenn
– Fire-mode, fade-out frequencies
– Adjustable clock frequency up to 32 kHz
– RoHS, WEEE compliant (recycling rate 88%)
– CE, UL, cUL, cTick, EAC, RoHS
– Lacquered boards

your benefits

Areas of application

Frequently asked questions about the product

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

  2. When using shielded cables between the inverter and the motor, the shield must be connected to earth at both ends. Cable interruptions should be avoided as far as possible. If it is necessary to separate the cable, e.g. in order to install a motor contactor, then 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 unit, ensure that the ground points are at the same potential.

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

  6. Separate routing of control and power cables should be aimed for. If the cables have to be laid in parallel, e.g. on the same cable route, the greatest possible distance (> 20 cm) should be chosen.

  7. The shielding of the installed cables should have a low RF impedance if possible. Therefore, copper braiding is preferable to steel braiding.

  8. The HF contact resistance at the connection points between the shielding and the 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. The use of earthing glands is advantageous.

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

  10. For unshielded cables, the cable cores should be twisted and output filters should be used.