Operating Conditions - Woods AC Manual

5. OPERATING CONDITIONS

• Do not operate fans in an explosive atmosphere.
• Duty type of fan
- Continuous operation with occasional starts (S1) according to DIN EN 60034-1:2011-02.
- Occasional starting between -40°C and -25°C is permissible.
- Continuous operation below -25°C only with special bearings (on request).
- Any use below -10°C is dependent on not being subjected to unusual, sudden or mechanical loads or
stresses on the material
• Woods Plate Fans are suitable for operation with frequency inverters when the following points are compiled:
- Between the inverter and the motor, sinusoidal filters should be incorporated which are effective for all
phases (sinusoidal output voltage, phase against phase, phase against protective conductor) as offered by
manufacturers.
- du/dt filters (also called motor or suppression filters) cannot be used in place of sinusoidal filters.
- When using sinusoidal filters, screened motor leads, metal terminal boxes, and a second earth connection to
the motor, if necessary, can be omitted. Check back by the manufacturer of sinusoidal filter.
• If the operational leakage current exceeds 3.5mA, earthing in compliance with DIN EN 50 178, art. 5.2.11.1
must be provided. For this purpose, there is a connection for a second protective earth on the stator flange.
Tightening torque 2.7 Nm.
• When speed controlling through electronic voltage reduction (phase control), depending on the installation
situation, increased noise formation caused by resonances can occur. In such cases we recommend the use of
a frequency changer with integrated sine filter.
• Woods EC fans are with EC motors with maximum efficiency. Highly efficient, electronically commutated motors
with permanent magnets are used, the speed of which is controlled by the integrated controller.
• The devices of the EC fans are constructed in accordance with the general requirement in EN61800-2 for
adjustable speed electrical power systems and is intended for one-quadrant drives.
• We cannot guarantee that competitive makers of voltage control devices and frequency converters will function
properly and not damage the motor when used for a rotational-speed control of our fans.
• IP55 fans with a seal which is rubbing may cause additional noise.
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