FILTER AS-FUEL 3313778 - Caterpillar

When the Power Train Electrical System Service Shutdown procedure has been performed and a hazardous level of DC voltage has been measured on the DC power bus or at a component connection in an Inverter high-voltage compartment, this status is an indication that a serious failure or multiple failures have occurred in the systems in the cabinet. After this discharge procedure has been successfully performed, the cause of this problem must be investigated and resolved before the machine can be operated. Do not start the Engine until the problem has been resolved.
Manual Discharge Procedure
Preliminary conditions that must be met before this procedure is performed:
The Engine Lockout Control is locked in the ON (lock out) position.
The required personal protective equipment is being worn by the personnel that are performing the procedure.
The cover for the high-voltage compartment where the discharging will take place is removed.Once these conditions are met, proceed with the following procedure.
Before using the Dual Handle Discharge Resistor Tool, verify that the wire conductor is securely connected between each discharge resistor assembly that is on each probe as shown in illustration 12.
Use a multimeter to measure the resistance between the discharge tool probes. The resistance between the probes of a new tool is approximately 2300 ohms. If a resistance is measured that is below 1500 ohms, replace the discharge tool. If an open circuit (megohms or greater) resistance is measured, replace the tool before proceeding with this procedure.
Illustration 12 g01788008
Typical example of a dual handle high-voltage discharge resistor tool
Illustration 13 g01681846
Manual discharging between the DC power bus positive (DCP) bus bar and the DC negative (DCN) bus bar
Note: When using the discharge tool to contact the DC bus bars, a small amount of electrical arcing may occur. This arcing is normal. However, when a probe tip is close to the bus bar, a quick movement to contact the bus bar will reduce the possibility of electrical arcing.
At the compartment or component where the DC power bus must be discharged, place one discharge tool probe on the uninsulated section of the positive bus bar or