ABB A8A2 fault code meaning

ABB / A8A2

Series: ACH531, ACQ531, ACQ580

RO Jog warning

drive

Meaning: The rate of relay output status changes has exceeded the recommended range, for example because a rapidly changing frequency signal is connected.

Possible causes

Source: ACH531 Firmware Manual P131; ACQ531 Firmware Manual P113; ACQ580 Pump Control Program Firmware Manual P187

Series: ACH580, ACS530

RO Jog warning

drive

Meaning: The rate of relay output status changes has exceeded the recommended range, for example when a rapidly changing frequency signal is connected.

Possible causes

Source: ACH580 HVAC Control Program Firmware Manual P281; ACS530 Firmware Manual P265

Series: ACM510-S, ACP510, ACS180, ACS280, ACS380

RO switching warning

drive

Meaning: The relay output is changing status faster than recommended, for example, if a rapidly changing frequency signal is connected to the output.

Possible causes

Source: ACM510-01S_04S Drive Firmware Manual P362; ACP510 Standard Control Program Firmware Manual P362; ACS180 Machinery Control Program Firmware Manual P317; ACS280 Firmware Manual P336; ACS380 Machinery Control Program Firmware Manual P433

Series: ACM510-V, ACS580

RO switching warning

drive

Meaning: The relay output status is changing too rapidly, for example because a signal with a rapidly changing frequency is connected.

Possible causes

Source: ACM510-01V_04V Drive Firmware Manual P402; ACS580 Standard Control Program Firmware Manual P529