3 | Essential safety instructions
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Operating instructions CMVpro 125-400 ATEX | Version 1-en
3.4
Electrical hazards
DANGER
Danger to life due to electric shock from contact with cur-
rent-carrying conductors or components under hazardous voltage.
Immediate danger to life due to respiratory and cardiac arrest.
▪ Only a qualified and authorized electrician may work on the power mains
and the electrical components of the fan.
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Prior to beginning mounting, maintenance, and repair work: Use the isola-
tion switch to remove voltage on all phases.
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Prevent unauthorized start-up of the fan: Hang personal padlock and tag on
isolation switch.
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Establish an electrically safe work condition before beginning work.
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Promptly rectify any defects discovered in the electrical components and
wiring of the fan.
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Eliminate moisture from current-carrying components to avoid a short cir-
cuit.
WARNING
Risk of injury due to fire caused by short circuit
Burns, respiratory tract damage due to toxic fire smoke.
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Protect cables from mechanical, chemical, and thermal stresses.
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Regularly inspect the fan’s electrical components. Replace damaged com-
ponents and cables immediately.
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Have and periodically inspect suitable fire extinguishers. Observe the safety
instructions on the fire extinguisher.
3.4.1
Danger due to electromagnetic interferences
Observe the following safety and hazard instructions if the fan is used with a fre-
quency converter.
Frequency converters generate electromagnetic interference during operation
and can cause high-frequency leakage current in the electric motor, supply
power network, and grounding system.
CAUTION
Interference from electromagnetic fields
Disturbance of sensitive electronic equipment by electromagnetic fields.
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When the fan is running, persons with pacemakers and other implanted
electronic devices must not remain in the immediate vicinity of the fre-
quency converter and electric motor.
NOTICE
Disturbances to other devices from electromagnetic fields as
well as bearing damage to electric motor due to leakage current
Exceeding legally permissible emission limits.
Reduced lifespan of the motor bearing.
Possible system operating faults and production interruptions.
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Use of suitable interference suppression and shielding methods, such as a
mains suppression filter and shielded motor connection cable.
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EMC-compliant equipment design, especially for cable routing and shielding
connections. See EMC Guide of the manufacturer and/or third-party equip-
ment manufacturer.
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Observe FC manufacturer's recommendations for avoiding electromagnetic
interferences.