KOJA 0603, Инструкция по эксплуатации и обслуживанию

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AIR HANDLING UNIT FUTURE
INSTRUCTIONS FOR OPERATION AND MAINTENANCE
Fan section, motors and frequency converters
2017-02-13 V. 2.0 33
12. FAN SECTION, MOTORS AND FREQUENCY CONVERTERS
Future unit series’ fans are available with a short circuit motor, EC motor or permanent magnet motor (PM).
Short circuit motors are available, with or without a frequency converter. Permanent magnet motors always
come with a parameterised frequency converter, also available ready-connected. The EC motors are always
equipped with an integrated control unit.
WARNING
The component manufacturer’s installation and operating instructions must be followed.
In case of a discrepancy between these instructions and the component manufacturer’s
instructions, follow the component manufacturer’s instructions.
WARNING
Electrical installations must comply with EMC requirements. For EMC-compliant
connections, refer to the instructions in the frequency converter manufacturers’ installation
guides. Connections made at the Koja factory comply with these requirements. Koja is not
responsible for damages, if the connections made by the customer do not comply with
general EMC requirements. Such damages include, for example, motor bearing damage due
to bearing currents.
WARNING
The frame of the ventilation unit must be connected to the building’s earthing system
before operation.
WARNING
The fans have a supply frequency for the maximum rotation speed stated in the fan
plate. When using a frequency converter, make sure that the maximum frequency is not
exceeded.
WARNING
The motor and/or frequency converter supply cables must be equipped with a service
switch. If the service switch is installed between the motor and frequency converter, the
switch must be EMC approved and connected in compliance with the EMC regulations. Pay
special attention to the screened 360 degree connection and protective ground continuity.
WARNING
The earth leakage current from the frequency converters exceeds 3.5 mA. According to
standard EN61800-5-1, the frequency converter connection must, therefore, be fixed and
the cross-section of the protective earthing conductor of the supply must be at least 10
mm
2
(Cu) or 16 mm
2
(Al). Alternatively, the frequency converter supply can be equipped
with an additional protective earth conductor of the same cross-section than the actual
protective earth conductor. Local regulations must also be followed. The earth leakage
current from the integrated control unit of the EC motors is below 3.5 mA.
WARNING
The electric motors and frequency converter are serviced according to the manufacturer’s
instructions. The components must be de-energized and the impeller stopped for the
duration of the maintenance. Once opened, the rotors and stators of the permanent
magnet motors (EC and PM motors) may cause interference in electrical devices, such as
phones and payment cards. Being in close proximity to opened permanent magnet motors
constitutes a danger to people with pacemakers.
WARNING
Permanent magnet motors rotating freely in air flow operate as generators. To prevent the
risk of electric shock, the axles of permanent magnet motors must, therefore, be locked for
the duration of the maintenance.