Bomag BW 156 D-3 Service Manual page 149

Service Training
Ignition on, with engine at rest
When switching the ignition on the program is set to a defined initial condition.
For self-testing all warning and control lights are switched on for a short moment.
If a fault should occur already at this state, the corresponding control light would stay on.
However, warning buzzer (H07:27) and shut-off relay (K22:44) (Fig. 2) still remain deactivated, because
there is no oil pressure yet. If the time between „ignition on" and „engine start" is too long, the engine
can no longer be started.
Diesel engine in operation
The fault indication is activ, warning buzzer and shut-off relay are enabled.
Within the specified time all sender signals must change to the corresponding potentail for the condition
„O.K." Otherwise:
• the signal fields will light,
• the warning buzzer is activated
• and the shut-off relay is switched off after a predetermined time.
Engine stalled, ignition on
The fault indication remains active, warning buzzer and shut-off relay will be activated after pre-
determined times.
In order to re-establish to a defined initial condition the ignition must be switched off for a moment before
attempting a new start.
The engine was stopped by the shut-off relay
The fault that causes the shut-down is stored and displayed.
The warning buzzer remains active. Other indications caused by the engine shut down are no longer
displayed. The operator is thereby able to recognize and rectify the problem.
Then switch the ignition off to deactivate the shut-off relay and to enable a new starting process.
BW 156/177 D-3/PD-3 - G 8 -
BW 178/179 D-3/PD-3