Delta tUn fault code meaning
Delta / tUn
Series: C2000 Plus, CP2000, ME300
Auto parameter measurement
AC motor drive
Meaning: Auto parameter measurement in progress. The panel displays “tUn” during auto parameter measurement.
Possible causes
- Motor parameters: Motor parameter measurement is in progress.
- Automatically clears when the motor parameter measurement function is complete.
Source: C2000 Plus Series User Manual (DELTA_IA-MDS_C2000 Plus_UM_TC_20250522) P788; CP2000 Series User Manual (DELTA_IA-MDS_CP2000_UM_SC_20250704) P648; ME300 Series User Manual (DELTA_IA-MDS_ME300_UM_SC_20250407) P369
Series: CFP2000
Auto parameter measurement
AC motor drive
Meaning: Auto parameter measurement in progress. The panel displays tUn during auto parameter measurement.
Possible causes
- Motor parameters: Motor parameter measurement is in progress.
- Automatically clears when the motor parameter measurement function is complete.
Source: CFP2000 Series User Manual (DELTA_IA-MDS_CFP2000_UM_SC_20250731) P536
Series: CH2000
Auto parameter measurement
AC motor drive
Meaning: Auto parameter measurement in progress. The panel displays tUn during auto parameter measurement.
Possible causes
- Motor parameters: Motor parameter measurement is in progress.
- Automatically clears when the motor parameter measurement function is complete.
Source: CH2000 Series User Manual (DELTA_IA-MDS_CH2000_UM_SC_20251030) P736
Series: DPD-K
Auto parameter measurement
AC motor drive
Meaning: Parameter auto measurement in progress. The panel displays "tUn" during parameter auto measurement.
Possible causes
- Motor parameters: Motor parameter measurement is in progress.
- Automatically clears when the motor parameter measurement function is complete.
Source: DPD-K Series User Manual (DPD-K user manual_20211224) P587
Series: MH300-HS, MH300, MP300
Auto parameter measurement
AC motor drive
Meaning: Parameter auto-measurement is in progress. The panel displays tUn during parameter auto-measurement.
Possible causes
- Motor parameters: Motor parameter measurement is in progress.
- Automatically clears when the motor parameter measurement function is complete.
Source: MH300 Series (High-speed Models) User Manual (DELTA_IA-MDS_MH300-HS_UM_SC_20241213_v3) P440; MH300 Series User Manual (DELTA_IA-MDS_MH300_UM_TC_20260505) P674; MPD_MP300 Series User Manual (DELTA_IA-MDS_MPD_UM_SC_20260326) P332
Series: MS300, MX300
Auto parameter measurement
AC motor drive
Meaning: Parameter auto-tuning in progress: The panel displays “tUn” while parameter auto-tuning is being performed.
Possible causes
- Motor parameters: Motor parameter measurement is in progress.
- The indication disappears automatically when motor parameter measurement is complete.
Source: MS300 Series User Manual (DELTA_IA-MDS_MS300_UM_TC_20260417_v2) P462; MX300 Series User Manual (DELTA_IA-MDS_MX300_UM_TC_20260226) P189