The Alarm module AM1 is designed to signal system failures. It is to be connected to theVBusÂ® of the controller and issues an optical signal via the red LED if a failure has occurred.
RESOL Alarm Module AM1 - Technical Product Brief
RESOL Alarm Module AM1 - Installation & User Manual
The AM1 also has a dry contact relay output,which can e. g. be connected to a building management system (BMS). Thus, a collective error message can be issued in the case of a system failure.
Depending on the controller and the sensors connected, different fault conditions can be signaled, e. g. sensor failures, excess or negative system pressure as well as errors in the flow rate, such as a dry run of the pump.