Cause : Solution for f0021 fault in abb drive, check your drive series and model number click on link to get solution for f0021 fault in abb drive. All list given below for this fault

For ABB ACSM1 Drive

Click here  F0021 STO1 LOST Fault in ABB ACSM1 Drive

For ABB ACS850 Drive

Click here F0021 STO1 LOST Fault in ABB ACS850 Drive

For ABB ACS310 Drive

Click here F0021 CURR MEAS Fault in ABB ACS310 Drive

For ABB ACS355 Drive

Click here F0021 CURR MEAS Fault in ABB ACS355 Drive

For ABB ACS550 Drive

Click here F0021 CURR MEAS Fault in ABB ACS550 Drive

For ABB ACS150 Drive

Click here F0021 CURR MEAS fault in ABB ACS150