KOJA 0603, Instruction For Operation And Maintenance

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AIR HANDLING UNIT FUTURE
INSTRUCTIONS FOR OPERATION AND MAINTENANCE
Fan section, motors and frequency converters
36 V. 2.0 2017-02-13
12.2. Connection of electric motor and frequency converter
WARNING
The incorrect connection of the frequency converter may damage the bearings of the
motor. Only an authorized electrician is allowed to carry out the connection. Koja Ltd does
not compensate for motor damage caused by an incorrect connection, if the connection
was made by anybody else than a person authorized by Koja Ltd.
WARNING
The fan has a frequency for maximum rotation speed stated in the fan plate. Make sure not
to exceed the maximum frequency for the frequency converter.
WARNING
The component manufacturer’s installation and operating instructions must be followed.
In case of a discrepancy between the manufacturer’s instructions and this manual, the
instructions of the manufacturer must be followed.
A
B
A-A
A
A
F
E
D
C
G
The electric motor is operated and serviced, accord -
ing to the manufacturer’s instructions. Check the
electric motor connection from the link box and/
or the type plate of the motor. The electric motor is
connected to the electrical network with a shielded
connector and equipped with a service switch.
If a frequency converter is used, the motor and fre
-
quency converter of the fan are connected with a
uniform screened cable (EMC). EMC approved inlet
sleeves are used for the motor and link box lead-in.
In every inlet, the protective sheath of the cable must
have a 360° grounding with an EMC sleeve. Make
sure that the EMC sleeve tightens properly around
the cable.
The service switch (accessory) installed between
the motor and frequency converter must be EMC
approved and installed according to the EMC regula -
tions.
A. Check the position of the motor connection plates
from the connection instructions of the motor.
B. If there is no separate protective earth conduc -
tor, the protective sheath of the cable is braided,
marked with yellow-and-green tape or heat shrink
and connected to the motor’s earth connector.
C. ECM sleeve
D. Electric conductor
E. Protective sheath of the cable (the jacket of the
electrical cable is stripped approx. 15 mm without
damaging the protective sheath)
F. Wire jacket
G. Screened cable