Alpha Technologies AlphaGen PN-6x-T 7.5kW 48Vdc - Manual (Page 54)

54 042-288-B0-001, Rev. A2
ECM
4.0 The Engine Control Module
The Engine Control Module (ECM) controls and monitors the generator’s Auxiliary Power Unit (APU).
The ECM is a two part assembly made up of the ECM Printed Circuit Board (ECM PCB) and the
Generator Remote Interface (GRI) board. The GRI is attached to the ECM PCB with three ribbon
cables.
The ECM provides interface connectors for the enclosure sensors, engine controller, battery sense,
line sense, and other equipment. The ECM monitors AC line and DC bus status to determine when
to start and stop the APU. In the event of an extended power outage or low DC bus voltage, the ECM
starts the APU to prevent the backup batteries from discharging to a level that could compromise the
ability of the system to provide a continuous, reliable source of power.
The ECM monitors the entire system for abnormal operating conditions such as low engine oil
pressure, engine over-temperature, gas leaks, enclosure pad shear, etc. If certain abnormal
conditions or alarms are present, the ECM prevents the generator from starting or shuts it down
immediately. This provides public safety, and prevents damage to the APU.
The ECM provides an interface between the APU and Alpha communication devices. The ECM
controls and monitors the APU. Status information and alarms can be read from the front panel LEDs,
or by four “Form C” relay contacts. The ECM is capable of reporting 9 major alarms, 8 minor alarms,
and 2 notifications.
Fig. 4-1, Location of Engine Control Module (ECM)
ECM
CE-3x2 5K-T PN-6x-T 7.5kW