NORDAC FLEX (SK 200E ... SK 235E) – Brief instructions for Frequency Inverters
40 BU 0240 en-US-4920
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2.4 Operation in potentially explosive environments
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WARNING
Explosion hazard due to electricity
Electric sparks may ignite an explosive atmosphere.
• Do not open the device in an explosive atmosphere and do not remove any covers (e.g.
diagnostic openings).
• All work on the device must only be carried out with the system de-energized.
• Wait for the required time (≥ 30 min) after switching off.
• Before starting work, check that all relevant components (voltage source, connection
cables, connection terminals of the device) are de-energized using suitable measuring
equipment.
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WARNING
Explosion hazard due to high temperatures
High temperatures may cause the ignition of an explosive atmosphere.
Temperatures may occur within the device and the motor, which are higher than the maximum
permissible surface temperature of the housing. Dust deposits may restrict the cooling of the
device.
• Clean the device at regular intervals to prevent the accumulation of impermissible dust
deposits.
• Do not open or remove the device from the motor in an explosive atmosphere.
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WARNING
Explosion hazard due to electrostatic charge
Electrostatic charges may cause sudden discharges with the formation of sparks. Sparks may
ignite an explosive atmosphere.
The housing cover is made of plastic. This may become electrostatically charged, e.g. due to
a flow of particles caused by the fan.
• Avoid air movement or air flows at the operating location of the device.
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With appropriate modification, the device can be used in certain potentially explosive areas.
If the device is connected to a motor and a gear unit, the EX labeling of the motor and the gear unit
must also be observed. Otherwise, operating the drive in this environment is unauthorized.
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Size 4 devices (SK 2x0E-551-323 … -112-323 and SK 2x0E-112-340 … -222-340) are not approved for
operation in potentially explosive environments.
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