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NOTICE D’INSTRUCTIONS GENERALE POUR
COFFRETS ET ARMOIRES ELECTRIQUES
V3.0
Page 43 / 51
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Generally, the working cycle of a refrigeration compressorized machined destined for
refrigeration will be :
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The command system of the installation (pressostatic or electronic) will start the compressors
one after the other, according to the refrigeration load required (cold rooms, cabinets…).
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When no frequency converter is present, compressors steps are enabled one after the other
according to the refrigeration load.
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If one compressor is driven by a frequency converter, it will be generally started at first for
energy optimization, and its speed will evolve according to the request up to its maximum
authorized speed.
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NB : Operating ranges of the frequency converter are according to the compressor manufacturer
recommendations.
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Some installation may have resonance frequencies. The installer will have to adapt the frequency
converter settings in order to avoid resonance frequencies. This will be done to avoid any
problems of vibrations on the installation.