WASHER 7K8590 - Caterpillar

Electronic Locomotive Control System
The Electronic Locomotive Control System consists of:1. Main Electronic Control Box.2. Standard Personality Module.3. Engine Speed Sensor.4. Rack Position Sensor.5. Rack Actuator (the particular type depends on the engine type).6. Optional Voltage Sensor (Customer Supplied).7. Optional Current Sensor (Customer Supplied).8. Optional Derate Module.9. Optional Personality Module with Optional Software.10. Optional Mounting Group Assembly (a prewired assembly containing items 1 & 8).11. Optional Water Temperature Sensor and Temperature Interface Module.The various functions performed by the locomotive control system are fully defined by the active software package.The main control box contains resident software that performs the basic tasks of engine speed governing and engine power control. The control loops defined by this software use data in the standard personality module for their various parameter settings. This is the most basic system configuration and uses items 1 through 5. The engine load is controlled by modulating the generator's excitation current. This can be done in one of two ways: either by directly driving the exciter from the control, or by using a low current voltage drive circuit which interfaces with certain types of locomotive generator excitation systems.The next available level of complexity includes the addition of either item 6 and/or item 7. Item 6 is a D.C. signal proportional to the generator output voltage, and item 7 is a D.C. signal proportional to the generator output current. The hardware that generates these signals can be supplied by the customer, or Caterpillar's locomotive application group. When these items are included, the main generator can be protected from damage by voltage and current limiting control loops in the resident software.If items 6 and 7 are both included, the customer can also specify direct closed loop control of the power to the traction motors over all (or part) of the throttle range.The next available level of complexity includes the addition of item 8 (derate module), which also requires the addition of item 9 (optional personality module). The derate module provides five additional D.C. analog inputs to the system. The resident software cannot access this derate module, therefore optional software is required that resides in the optional personality module.This derate module and the optional personality module provide the Electronic Locomotive Control System with a high degree of flexibility for use on a wide variety of locomotive types, including those fitted with dynamic brakes and a wheelslip or wheel-creep control system.Item 10 is a optional mounting group assembly that contains the Main Electronic Control Box and the Optional Derate Module. These items are prewired to two Railroad Industry Standard Terminal Strips. Because it is prewired, Caterpillar recommend, that where possible, this mounting group assembly be specified for all applications requiring the Derate Module.The sensor and module in item 11 are used to linearly derate the engine power as a function of water temperature. This feature protects the engine during operation in high ambient temperatures.Basic System With Voltage And Current Sense Typical Optional System With Derate Module Electronic Locomotive Control Box
Electronic Locomotive Control Box