ARRANGEMENT-MG502-2.47:1 RATIO 3N4606 - Caterpillar

Illustration 13 g01788008
The 331-6563 Dual Handle High Voltage Discharge Resistor ToolIn addition to the PPE equipment, the following high voltage tools will be used for this procedure:
A 331-6563 Digital Dual Handle Discharge Resistor Tool.
A 331-6561 Digital Dual Handle High Voltage MeterManual 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 as shown in illustration 13.
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 14 g01681846
Manual discharging between the DC Power Bus positive (DCP) bus bar and the DC negative (DCN) bus barNote: 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 connection point (labeled DCP or P).
Place the other discharge tool probe on the uninsulated section of the negative bus bar or connection point (labeled DCN or N).Note: When discharging the voltage of the DC Power Bus through the discharge tool, the resister section of the tool and the cable that is connected between the resisters can become hot. Use caution when handling the discharge tool after the discharge has been performed.
Discharge the DC Power Bus for 3 minutes.Note: When a compartment contains components that are connected to the DC bus positive bars and the DC bus negative bars at more than one connection point, discharge the voltage between each of these positive and negative connections individually for 3 minutes.
After discharging the DC Power Bus for 3 minutes, use the digital dual handle high voltage meter to measure the voltage between the positive bus bar or connection point (labeled DCP or P) and the negative bus bar or connection point (labeled DCN or N).Note: Each time that a voltage has been measured in the contactor compartment or in any other compartment, the operation of the meter must be tested and qualified using the supplied proof tester. This qualification must be done to ensure that the meter is not damaged and that the voltage measurement is accurate. If the operation of the meter is