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can not supply any torque-generating energy. The drive is reliably torque-free. This state is
monitored internally in the drive.
10. If compressed air is used in the food industry and more specifically for direct food contact, it
is recommended, for optimal safety, to use certified Class 0 compressors in combination
with appropriate filtration depending on the application. Please contact your customer center
for advice on specific filtration.
11. The Variable Speed Driven compressor is equipped with an interior permanent magnet
(English: Interior Permanent Magnet (IPM)) motor. In case of malfunction of the inlet valve
and/or check valve at stop, the accumulated compressed air in the oil separation vessel or
air net can drive the compressor element in generator mode, resulting in the build-up of
dangerous tension in the motor supply cables.
12. Before commencing repair work on the variable speed drive:
a. Disconnect the adjustable frequency drive from line power.
b. Wait for the discharge of the DC link. See period of time on the warning label.
c. Measure that there is no voltage on the drive input and output terminals.
d. Disconnect the motor cables from the drive.
e. Ground the motor cables by temporarily connecting them together as well as to the PE.
1.3
Safety precautions during installation
Precautions during installation
1. The machine must only be lifted using suitable equipment in accordance with the applicable
safety regulations. Loose or pivoting parts must be securely fastened before lifting. It is
strictly forbidden to dwell or stay in the risk zone under a lifted load. Lifting acceleration and
deceleration must be kept within safe limits. Wear a safety helmet when working in the area
of overhead or lifting equipment.
2. The unit is designed for indoor use. If the unit is installed outdoors, special precautions must
be taken; consult your supplier.
3. In case the device is a compressor, place the machine where the ambient air is as cool and
clean as possible. If necessary, install a suction duct. Never obstruct the air inlet. Care must
be taken to minimize the entry of moisture at the inlet air.
4. Any blanking flanges, plugs, caps and desiccant bags must be removed before connecting
the pipes.
5. Air hoses must be of correct size and suitable for the working pressure. Never use frayed,
damaged or worn hoses. Distribution pipes and connections must be of the correct size and
suitable for the working pressure.
6. In case the device is a compressor, the aspirated air must be free of flammable fumes,
vapors and particles, e.g. paint solvents, that can lead to internal fire or explosion.
7. In case the device is a compressor, arrange the air intake so that loose clothing worn by
people cannot be drawn in.
6
The Safe Torque Off function does not disconnect the voltage of the main and auxiliary
circuits from the drive. Maintenance work on electrical parts of the drive or the motor can
only be carried out after isolating the drive system from the main supply!
All responsibility for any damage or injury resulting from neglecting these precautions, or
non observance of the normal caution and care required for installation, operation,
maintenance and repair, even if not expressly stated, will be disclaimed by the
manufacturer.
Instruction book
9829 3178 63
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