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Frequency inverter for speed adjustment of DS asynchronous motors, 0.75 to 75.0 kW, 380 to 480 V, 3~, protection class IP21 and IP54/55
ER321 K – with protection class IP21 for control cabinet installation
This new product range is a further development of the predecessor model ER32.
The series is intended for variable torque applications in building services, sewage and water works, e.g. fans and pumps. The development was carried out under the latest aspects of relevant standards and international regulations, including EMC, harmonic standard EN61000-3-12 and environmental compatibility, e.g. lead-free soldering and recyclability.
The ER321 is available in two versions ER321-…K, protection class IP21 and ER321-…G, protection class IP54/55 with(-V2) and without(-V1) additional switches. The ER321 is designed with a 4-digit 7-segment display. 7 buttons allow easy programming and control of the device from the display. The Local/Remote button is used to switch between the display and the control terminal strip. A multilingual plain text display is now available as an option.
The ER321 series frequency inverters have a mains filter integrated in the device, are CE marked in accordance with the EU Low Voltage and EMC Directives and comply with the applicable standards for frequency inverters EN 61800-3 and -5-1.
This new product range is a further development of the predecessor model ER32.
The series is intended for variable torque applications in building services, sewage and water works, e.g. fans and pumps. The development was carried out under the latest aspects of relevant standards and international regulations, including EMC, harmonic standard EN61000-3-12 and environmental compatibility, e.g. lead-free soldering and recyclability.
To achieve electromagnetic compatibility, the inverter must be operated with a built-in or external RFI filter.
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.
The shorter the cable, the lower the radio interference and leakage current. The maximum possible cable lengths must be taken into account.
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.
Control cables should not cross power cables if possible. Where this cannot be avoided, a right-angle intersection is recommended.
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.
The shielding of the installed cables should have a low RF impedance if possible. Therefore, copper braiding is preferable to steel braiding.
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.
The shielding should be applied to the housing as close as possible to the cable terminals. Longer, free cable ends act as antennas.
For unshielded cables, the cable cores should be twisted and output filters should be used.
The tables on page 150in the Programming Guide are used to diagnose and correct problems when an error, alarm, or pre-alarm condition occurs. If the problem cannot be solved by the measures described in the table, contact your BLEMO dealer
