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Commissioning and operationWhen the acoustic acknowledgement (Horn Quit key) has been pressed, the integratedbuzzer switches off. With the visual acknowledgement (Visual Quit key), the flashing textand the LED “Alarm” switches to continuous display. When the fault has been remedied,the alarm text disappears from the monitor. The LED “Alarm” goes out unless anotheralarm has been issued.In the case of alarms that have led to automatic stopping or reduction of the enginespeed by the central unit MMDS, the “RESET” key must also be pressed. Thisfunction is only enabled in the case of a stop alarm at engine standstill and in thecase of a slow down alarm below an engine speed of 800 rpm.Horn testIf the ’Clear horn’ key is pressed for approx. 5 seconds, the built-in buzzer sounds.System FailureThe front plate of the device has a red LED with the description ’System Failure’. This isactivated in the following two cases:A Failure of the serial data from the Safety, Alarm and Diagnosis system MMDS in theengine terminal box. In this case, LED “Alarm” also flashes and the message “SystemFailure” appears on the alarm screen.B Fault in the LCD monitor itself. In this case, no other message appears.Key functionsThe front of the device has 5 keys that enable various functions such as scrolling, contrastadjustment, alarm acknowledgement and menu control. The keys have the followingfunctions: Standard, Test, Menu and Special functions.Horn Quit:PrgStandard function: acoustic acknowledgement or deactivation of theinternal horn. All other monitoring devices in the system are acknowledgedvia the serial bus.Test function: Holding the key for at least 5 seconds activates thebuilt-in buzzer.PRG menu function: adopt currently selected setting (Prg=program)26