Man D 0836 LE 401 Operating Instructions Manual page 31

Operation of the display device MMDS-L
The display device has the following operating keys:
Switches off the alarm horn and the integrated buzzer
Switches off the flashing signal of the relevant warning lamp, i.e. the flashing light
switches to continuous light. Before the flashing signal is cleared, the alarm horn
must be switched off
Clears the alarm message (red warning lamp goes out)
Requirement for clearing an alarm message is:
− Pressing the keys "Horn off" and "Test" in that order
− Removing the cause of the alarm
− In the event of a reduction alarm the engine speed must be brought down be-
low 800 rpm in order to be able to reach higher speeds again
− In the case of a stop alarm, the alarm can only be deleted if the engine is at a
standstill
Function test of the warning lamps
If there is no alarm, the warning lamps can be tested.
When the "Test" key is pressed, all the warning lamps must light up
Dimming
All the alarm LEDs are automatically dimmed depending on the ambient luminosity. This
function is performed by a photoelement integrated in the front panel.
Horn test
If the "Clear horn" key is pressed for approx. 5 seconds, the fitted buzzer as well as
possibly horns fitted at the shipyard go off.
System failure
There are 2 different failure states, which are indicated by the failure LED flashing or
being continuously lit:
D A flashing system failure LED signifies a communication fault, i.e. the data bus is
open-circuited or malfunctioning. In this case, the plug connections on the MMDS-L
and the MMDS-SD serial distribution box must be checked for correct seating.
D A continuously lit system failure LED indicates an internal fault. The unit is faulty if this
status persists after it is switched off and on again.
Commissioning and operation
31