Man D 2848 LE 401 Operating Instructions Manual page 28

Alarms
If an engine alarm from the central unit MMDS or an alarm configured by the user is is-
sued, the built-in buzzer is activated and the LED "Alarm" flashes. At the same time, the
monitor switches automatically to the alarm screen. The new alarm is entered in the first
line as a flashing message.
The alarms that would be issued if the engine is stopped but the engine ignition is on
(e.g. lack of oil pressure) are suppressed (disabled) until the green LED "Engine run"
lights up. This occurs approx. 8 seconds after ignition engine speed has been reached.
When the acoustic acknowledgement (Horn Quit key) has been pressed, the integrated
buzzer switches off. With the visual acknowledgement (Visual Quit key), the flashing text
and 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 another
alarm has been issued.
In the case of alarms that have led to automatic stopping or reduction of the en-
gine speed by the central unit MMDS, the "RESET" key must also be pressed. This
function is only enabled in the case of a stop alarm at engine standstill and in the
case of a slow down alarm below an engine speed of 800 rpm.
Horn test
If the 'Clear horn' key is pressed for approx. 5 seconds, the built-in buzzer sounds.
System Failure
The front plate of the device has a red LED with the description 'System Failure'. This is
activated in the following two cases:
A Failure of the serial data from the Safety, Alarm and Diagnosis system MMDS in the
engine terminal box. In this case, LED "Alarm" also flashes and the message "System
Failure" appears on the alarm screen.
B Fault in the LCD monitor itself. In this case, no other message appears.
Key functions
The front of the device has 5 keys that enable various functions such as scrolling, con-
trast adjustment, alarm acknowledgement and menu control. The keys have the following
functions: Standard, Test, Menu and Special functions.
Horn Quit: Standard function: acoustic acknowledgement or deactivation of the in-
ternal horn.
All other monitoring devices in the system are acknowledged via the
serial bus.
P rg
Test function: Holding the key for at least 5 seconds activates the built-in
buzzer.
PRG menu function: adopt currently selected setting (Prg=program)
Commissioning and operation
30