Alpha Technologies APU Control Module (ACM) - Manual (Page 19)

19 018-340-B0-001 Rev. A
4.0 Alarms and Notifi cations, continued
4.2 Notifi cations
Additionally, the ACM will report the following “Notifi cation” information.
14. Line Failure (LF): The ACM’s determination of the state of AC line voltage. Loss of AC
utility input is one of the criteria for starting the generator. When replacing the Genasys ACU
this is a 240vac sense voltage. When replacing the ACU for the distributive 2.7kw 36Vdc
APU or 3.0kw 48Vdc APU it is a 120Vac sense voltage. There is a voltage selector on the
interface board that comes pre-confi gured depending on the level of this sense voltage.
15. Service Required (SR): Indicates that routine maintenance of the engine - generator
is overdue. This alarm activates when Service Countdown reaches 0. It is cleared by
depressing the service timer reset button for fi ve seconds. (Refer to Section 5.2 “System
Maintenance” for further information).