An OH, OH1, or OH3 fault (fault codes 9, 10, and 29 on the touchscreen, respectively) is an overheating fault. The VFD has exceeded the rated temperature. Below are some possible causes and solutions for this fault.
1. The ambient temperature is too high. Yaskawa VFDs can operate up to a maximum ambient temperature of 40C/104F inside of the VFD control panel. If temperatures are higher than this inside of the VFD control panel, it is recommended not to attempt to operate the fans.
2. The VFD control panel is mounted too close to a heat source. Relocate the VFD control panel further away from the heat source.
3. The internal fan on the VFD has failed. The fan can be tested by placing a small piece of paper on top of the VFD while it is operating. If the paper does not blow, the fan may be defective and the VFD will need to be replaced.
4. The motor is overloading. While you should see a motor overload fault instead, occasionally you will see a temperature fault. Refer to the motor overload troubleshooting here.
5. There is a VFD programming issue. Contact MacroAir Technical Support to verify the VFD programming.
6. 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.
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