Tfe = Power Mod Overheated; First Occurrence; Repeated Occurrence; Blk = Locked Motor - Daikin MicroTech III DPS Installation And Maintenance Manual

TFE = Power Mod Overheated

First occurrence:

Excessive ambient temperature may be responsible.
Question: • Do other fans (temporarily) show the same failure within the arrangement? Could ambient temperature have been
too high? Or is the motor overloaded?
• Is it possible to connect the fan to EC Control in order to display the temperature?
• Is the displayed temperature within the expected temperature range?
Corrective: If the displayed temperature is too high:
• Check the module temperature during operation in each operating mode (Tmodule <110°C; switching-off
temperature 115°C)
• Check the fan load and supply voltage: Measure the input power at max . load/ operating point and compare the
measured value with nominal data on the label . Is there any discrepancy?
• Reset the failure; re-start the motor and observe it .

Repeated occurrence:

Question:
Do other fans show the same failure?
Yes: Systematic search for the reason of too high ambient temperature, overload, overvoltage or low voltage .
Perhaps use a data logger .
No: It seems to be a hardware problem of the fan . Fan need to be replaced .

BLK = Locked Motor

First occurrence:
Question: • Is it possible that the motor was locked by an obstruction or ice?
• Do other fans show the same behaviour?
Corrective:
Remove the reason for blocking . Caused by ice: activate the shake-loose functionality (starting with ModBus 5) or
increase the starting phase control factor .
Repeated occurrence:
Question: • Does increasing the starting phase control factor improve the situation?
No: It seems to be a hardware problem of the fan . Fan need to be replaced .

SKF = Communication Error

First occurrence:
Power fluctuations may be responsible.
Corrective: Reset the failure; re-start the motor and observe it. If applicable, filter out the source of the disturbing signal.
Repeated occurrence:
Question: • Do other fans show the same failure?
Yes: systematic search for peaks of disturbance voltage
No: It seems to be a hardware problem of the fan . Fan need to be replaced .
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Appendix – General