DIAGNOSTIC STATUS CODES
SX TRANSISTOR CONTROL | Page 16 |
Section 4.0 TROUBLESHOOTING AND DIAGNOSTIC STATUS CODES
Section 4.1 General Maintenance Instructions
The transistor control, like all electrical apparatus, does have some thermal losses. The semiconductor junctions have finite temperature limits, above which these devices may be damaged. For these reasons, normal maintenance should guard against any action which will expose the components to excessive heat and/or those conditions which will reduce the heat dissipating ability of the control, such as restricting air flow.
The following Do’s and Don’t’s should be observed:
Any controls that will be applied in ambient temperatures over 100° F (40° C) should be brought to the attention of the vehicle manufacturer.
All external components having inductive coils must be filtered. Refer to vehicle manufacturer for specifications.
The wiring should not be directly steam cleaned. In dusty areas, blow
For the control to be most effective, it must be mounted against the frame of the vehicle. The metal vehicle frame, acting as an additional heat sink, will give improved vehicle performance by keeping the control package cooler. Apply a thin layer of
Control wire plugs and other exposed transistor control parts should be kept free of dirt and paint that might change the effective resistance between points.
CAUTION: The vehicle should not be plugged when the vehicle is jacked up and the drive wheels are in a free wheeling position. The higher motor speeds can create excessive voltages that can be harmful to the control.
Do not hipot (or megger) the control. Refer to control manufacturer before hipotting.
Use a
Visual inspection of GE contactors contained in the traction and pump systems is recommended to occur during every
160 hours of vehicle operation. Inspection is recommended to verify that the contactors are not binding and that the tips are intact and free of contaminants.
GE does not recommend that any type of welding be performed on the vehicle after the installation of the control(s) in the vehicle. GE will not honor control failures during the warranty period when such failures are attributed to welding while the control is installed in the vehicle.
Section 4.2 Cable Routing and Separation
Electrical noise from cabling of various voltage levels can interfere with a
Section 4.2.1 Application Responsibility
The customer and customer’s representative are responsible for the mechanical and environmental locations of cables. They are also responsible for applying the level rules and cabling practices defined in this section. To help ensure a lower cost,
On new installations, sufficient space should be allowed to efficiently arrange mechanical and electrical equipment.
On vehicle retrofits, level rules should be considered during the planning stages to help ensure correct application and a more
Section 4.2.2. Signal/PowerLevel Definitions
The signal/power carrying cables are categorized into four defining levels: low, high, medium power, and high power. Within those levels, signals can be further divided into classes.
Sections 4.2.2.a through 4.2.2.d define these levels and classes, with specific examples of each. Section 4.2.3 contains recommendations for separating the levels.
4.2.2.a Low-Level Signals (Level L)
•Analog signals 0 through ±15 V
•Digital signals whose logic levels are less than 15 V DC
•4 – 20 mA current loops
•DC busses less than 15 V and 250 mA
The following are specific examples of level L signals used in drive equipment cabling:
January 2000