A SCF1 fault (fault 23 on the touchscreen) is a motor short circuit fault. There are many possible causes for this and you will need to use your best judgment to narrow things down. Below are some potential issues that could cause this fault.
1. The motor cable is not wired to the VFD motor terminals. Ensure that the motor cable is landed on the correct terminals. Ensure that the cable is stripped properly so that the terminal is not biting on any insulation. Ensure that there are no frayed ends of wires touching other wires.
2. A wire is loose or missing on the output side of the VFD. Confirm that the wires are snug in the VFD motor output terminals and that they are properly tied together inside the motor. Ensure that there are no frayed ends of wires touching other wires.
3. 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. The MacroAir factory-provided cable must be used with no additional cable spliced.
4. The motor is miswired. This is most commonly seen on AVDX since the motor uses different wiring configurations for 208V versus 480V applications, but any motor can be miswired. Ensure that the cable is stripped properly so that the terminal is not biting on any insulation.
5. The system is not properly grounded. Verify that all wiring is correctly grounded on the input and output side of the VFD.
6. (370 only) The set screws on a Rapid Mount Commercial were not properly tightened, allowing the motor to spin and damage the motor cable. The motor cable will need to be replaced and there is a chance that the motor is damaged as well. Ensure that the set screws on the Rapid Mount Commercial are properly tightened to prevent unwanted motor movement. Contact MacroAir Technical Support for any necessary replacement parts.
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