Operating range monitoring
- Heating, ventilation and air conditioning
- Multiple fans driven by multiple motors are connected to a frequency converter. The internal monitoring systems in the frequency converter cannot recognise the failure of an individual fan.
- The permissible operating range of the electric motor for each fan is monitored with a cos phi monitoring unit using the “under” function. As soon as the cos phi leaves the acceptable range, for example because of a load reduction due to a defective V-belt or a dirty filter, the relay output is tripped, and the higher-level control system can recognise the fault.
- - Fast and low-cost monitoring, simple retrofit
- No sensor needed in the air channel – relevant for dust, heat and aggressive exhaust gases
- Lower maintenance requirements than for direct measurement in the air channel
- Measuring relay suitable for use with frequency converters
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