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EIOM v2018.04
NOTE: Breakdown of EC fan can only be recognized via fault relay.
• Control with UNIcon as MODBUS Master
All EC fans are equipped with AM-MODBUS modules.
NOTE: Breakdown of EC fan can be recognized via MODBUS communication line.
NOTE: For both control types an external control signal is needed.
For more information, control, maintenance, diagnostics and troubleshooting refer to EMR‘ex and UNIcon technical specification.
General:
Before starting any inspection works, fans must be disconnected from voltage and all safety requirements must be followed.
Possible solutions if the fan does not rotate:
• Check connectors and contacts;
• Check if the electrical connection of the motor is correct;
• Check if the wires of the control cable is not mixed;
• Check if the voltage supplied to the motor;
• Check if motor safefty switch is turned on;
After starting the device, check if:
• The motors rotate smoothly, do not vibrate and do not produce side noise;
• Airflow produced by the device matches air direction indicated on the housing;
• Thermal protections of the motor are not activated;
• Overcurrent (overload) protections of the motor are not activated;
• Motor speed changes when adjusting the control (when the device has built-in control system).
3.4 FANS WITH PM MOTORS
Direct on-line connection is not possible for permanent magnet motors. Speed controller is always needed. This controller has special algorithm
for PM motors. Speed controller is programmed with fan and motor specific parameters.
PM motor speed controller types:
• VSD integrated on motor;
• VSD delivered loose (FC101 and FC102).
3.4.1 VSD INTEGRATED ON MOTOR
Integrated on motor means that the frequency controller is mounted at the side of the fan. If the fan service side is on the other side, the drive can
easily be moved there by opening four screws. Cabling between motor and drive is already done. Built-on version is ready to be used and needs
only power from mains and control signals. They can be easily connected to the terminals under the drive’s plastic cover.
