Safety relay change( Add time delay function) Alternator "L" Key "C" *** During the air bleeding procedure from fuel line, We need more cranking time to start engine. But at this situation, new alternator produce a little bit higer voltage at the termianl “L”. So this voltage deenergize safety relay and interrupt start motor. To prevent this, we add the time delay function at safety relay. GND Safety lever (1) Old(14526226) (1) New(14531201) ***td = 30 +/- 5sec Volvo Construction Equipment Customer Support UPDATE - EC160B~460B - 27 Normal operation e Hold key switch on ST position after ngine started Tum the key switch to ST and ON while engine .
is running Start the engine again after the failure KEY SWITCH v ST ON O t ST N v ST ON t ST ON SAFETY RELAY v t v OFF t ON OFF 2-4 sec. 2-4 sec STARTER v t r/min OFF t ENG r/min OFF t ALT t r/min OFF t SAFETY RELAY o Prevent verrunning Prevent restart Prevent overrunning while motor is cranking Normal operation Hold key switch on ST position after engine started. Tum the key switch to ST and ON while engine is running Start the engine again after the failure KEY SWITCH v ST ON t ST ON v ST ON t ST ON SAFETY RELAY v t v OFF t ON OFF 2-4 sec. STARTER v t r/min OFF t ENG r/min OFF t ALT t r/min OFF t SAFETY RELAY Prevent overrunning Prevent restart Prevent overrunning while motor is cranking