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
2017-02-13 V. 2.0 37
12.3. PM motors
WARNING
Risk of electric shock! Due to the permanent magnet rotor, permanent magnet motors
rotating freely operate as generators. Therefore, the connectors of the motor may be
energized, even with the power supply switched off. For safety reasons, the impeller must
be locked for the duration of maintenance.
The permanent magnet motors comply with efficiency class IE4 requirements. The permanent magnet motors
do not work connected directly to the network; they must always be controlled by a compatible frequency
converter. PM motors supplied by Koja always include a separate or fixed (integral motor) frequency converter.
Integrated frequency converters are available up to 7.5 kW, and separate frequency converters up to 11 kW.
Depending on the model, the type of the frequency converter is Danfoss FC101-106.
Conditions of use Motor
Separate frequency
converter
Integrated frequency
converter
Protection class IP55 IP54 IP55
Minimum ambient tempera -
ture
–15 ˚C 0 ˚C –10 ˚C
Maximum ambient tempera -
ture
40 ˚C 40 ˚C 40 ˚C
To ensure the optimal operation of the permanent magnet motor, all frequency converters are parameterised at
the factory to suit the motor in question. Parameterisation includes the motor plate values, ramps, speed and
frequency limits, as well as settings for starting and stopping. The parameters related to the frequency convert -
er motor control or the motor must not be changed, for this could lead to a motor starting failure or unstable
operation. The main menu password is 100, the shortcut menu password 200. The parameters are saved on the
frequency converter panel, from which they can be reloaded to the frequency converter, if necessary. Integrat -
ed frequency converters have an optional control panel.
The programmable inputs and outputs of the frequency converter can be used to connect the building automa
-
tion system and the frequency converter. The field-bus physical layer is RS-485, and the built-in communication
protocols are Modbus RTU, BACnet MSTP, N2 Metasys and the FC protocol. For more information about the
frequency converter connections and bus communication, refer to the frequency converter manufacturer’s
instructions.
The key inputs and outputs of the frequency converter are described in the figure
PM motor . The enable device
input is delivered by a potential-free contact to connectors 12 and 18. Locking can be actuated via connectors
12 and 27. If locking is open, the motor will not start, even from the control panel. The speed set point can be
provided by a 0…10 V signal to connectors 55 (-) and 53 (+). Relay output one provides a frequency converter
alarm, and relay output two running information.