ABB A127 fault code meaning
ABB / A127
Series: DCS500B
Ext. FAN ack.alarm
DC drive
Meaning:
Possible causes
Source: DCS500B Operation Manual Chinese edition (official site)
Series: DCS550
Analog input out of range
DC drive
Meaning: Analog input range
Possible causes
Source: DCS550 Manual (EN, official site)