ELECTRONIC LOCOMOTIVE CONTROL SYSTEM IIA Caterpillar

1.1: Engine Control

* Fully electronic eight notch engine speed governor.

* Low idle notch engine speed governor setting.

* Dual engine speed ramp rates for switch-yard and main-line operation.

* Smoke limiting rack schedule during engine start.

* Dual engine speed for low and high levels of dynamic braking.

1.2: Traction Power Control

* Low notch traction power control (typically in notches one thru three).

* High notch gross engine power control (typically in notches four thru eight).

* Load test mode.

* Generator voltage limiting.

* Generator current limiting.

* Differential wheelslip regulation.

* Synchronous wheelslip regulation.

* Traction motor current limiting.

* Traction motor current matching (performance control).

* Automatic sanding.

1.3: Dynamic Brake Control (If Equipped)

* Grid current regulation.

* Field current regulation.

* Differential wheelslip regulation.

* Automatic sanding.

* Grid cooling fan failure alarm.

* Grid current alarm.

1.4: Engine Protection

* Linear power derate with high coolant temperature (through traction power control).

* Step power derate with high coolant temperature (backup to the linear derate through traction power control).

* Linear power derate with low barometric pressure (through traction power control).

* Low oil pressure shutdown.

* Overspeed shutdown.

* Automatic drop out of starter motors.

* Starter motors inhibited from engagement with engine running.

* High crankcase shutdown (if equipped).

* High coolant temperature alarm.

1.5: Maintenance

* Comprehensive fault diagnostic indications.

* Fault tolerant (limp home current limits) under certain conditions of sensor/harness failures.

* Fail-safe strategy (zero excitation) in event of multiple sensor/harness failures.

* Each individual module in the electronic governing system is pre-calibrated for reliable and easy maintenance.

* Emergency shutdown annunciation outputs available.