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N700E INSTRUCTION MANUAL
IV
NOTE: POLLUTION DEGREE 2
THE VFD MUST BE USED IN THE ENVIRONMENT OF THE POLLUTION DEGREE 2.
TYPICAL CONSTRUCTIONS THAT REDUCE THE POSSIBILITY OF CONDUCTIVE POLLUTION
ARE,
1) THE USE OF AN UNVENTILATED ENCLOSURE.
2) THE USE OF A FILTERED VENTILATED ENCLOSURE WHEN THE VENTILATION IS FAN
FORCED THAT IS, VENTILATION IS ACCOMPLISHED BY ONE OR MORE BLOWERS WITHIN
THE ENCLOSURE THAT PROVIDE A POSITIVE INTAKE AND EXHAUST.