V-MAC Co-Pilot Operator's Manual 19 Engine Derate (For Mack Engines Only) For some conditions (see table below), an engine derate can occur first and if a condition worsens, then an engine shutdown can occur. Note: For Cummins engine information refer to the Cummins engine operator manual or a Cummins dealer CONDITION ENGINE DERATE ENGINE SHUTDOWN INDI- CATOR LIGHTS Intake Manifold Air Temperature Derate starts at 120°C (248°F). Full derate (100%) occurs when temperature is at 140°C (284°F). No engine shutdown. No warning indicators. Engine Turbocharger Compressor Outlet Temperature Derate starts at 245°C (473°F). Torque is derated down to 100% at 250°C (482°F). No engine shutdown.
No warning indicators. Engine Exhaust Gas Recirculation (EGR) Temperature If temperature exceeds 220°C (428°F) for more than 20 seconds with a 30 second period, derate starts. No engine shutdown. No warning indicators. If temperature reaches 240°C (464°F), a 100% derate occurs. Crankcase Pressure (CCP) If a change in pressure (difference between the CCP and barometric pressure (BARO) rises about 5 kPa (0.725 psi) with an offset & 0.5 kPa/s (0.07 psi/s) and stays over 5 kPa (0.725 psi) for more than 80% of the time during 1 second, the engine will fully derate (100%), be forced to idle, and shut down. Engine shutdown. Red engine shutdown indicator.
High Engine Coolant Temperature (ECT) Derate starts at 106.75°C (224.15°F) and ramps down to 12% derate. Torque is kept constant until the temperature reaches 107.25°C (225.05°F). Amber malfunction indicator lights at 107.2°C (224.96°F). Derate starts again at 107.4°C (225.32°F) and ramps down to 32% derate. Red engine shutdown indicator lights at 108°C (226.4°F). Torque is derated down to 100% at 108.4°C (227.12°F). Engine shutdown if temperature rises to 109°C (228.2°F).