Delta CP21 fault code meaning
Delta / CP21
Series: MX300
Ethernet internal communication timeout
AC motor drive
Meaning: Ethernet communication timeout between the rectifier axis and an inverter axis in a multi-drive AC motor drive system
Possible causes
- Poor contact between modules
- Rectifier error
- 8-101
Source: MX300 Series User Manual (DELTA_IA-MDS_MX300_UM_TC_20260226) P190