A OL1 or OL2 fault (fault codes 11 and 12 on the touchscreen, respectively) stands for Overload. The VFD has detected that the current (amps) on the output of the VFD has exceeded what was expected. There are several possible reasons why this may happen and you will have to use your best judgment based on the situation. If the fan will not run, try removing the motor leads from the VFD output to see if the VFD will run without the motor connected.
1. There is a short on the input or output. Verify all input and output wiring. Test the VFD without the motor connected to see if the fault goes away.
3. The motor is miswired. This is most commonly caused by not rewiring motors from high voltage to low voltage. Verify that the motor is properly wired for high voltage (480V) or low voltage (240V) depending on your application. Ensure that the cable is stripped properly so that the terminal is not biting on any insulation.
4. The incorrect blades are installed on the fan. Gearbox fans can only run the blade size that they were built for. If there are multiple sizes on site, ensure that the correct blades are being used on the corresponding motor unit. Please contact MacroAir Technical Support for further assistance.
5. The motor cable is incorrect. It could be damaged, exceed the maximum allowable length, or it is a cable sourced from a 3rd party that does not meet the necessary specifications. Our cable must be used with no additions or substitutions in order to ensure the proper operation of the fan and maintain the warranty.
6. There is a VFD programming issue. Contact MacroAir Technical Support to verify the VFD programming.
7. The fan is not running the correct speed. There are possible reasons for this other than the incorrect blades being on the fan, so please contact MacroAir Technical Support for further troubleshooting.
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