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Questions and Answers
Which type of motor is used in the propulsion systems of the 906 CWL and 950 GC MWL?
Which type of motor is used in the propulsion systems of the 906 CWL and 950 GC MWL?
What is the primary function of the propulsion motor in an excavator?
What is the primary function of the propulsion motor in an excavator?
How are the lubrication needs of the propulsion motors managed?
How are the lubrication needs of the propulsion motors managed?
Which statement accurately describes the inverter for the 320 MHEX?
Which statement accurately describes the inverter for the 320 MHEX?
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What components make up the propulsion module of the 950 GC MWL and R1700 XE LHD?
What components make up the propulsion module of the 950 GC MWL and R1700 XE LHD?
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Which excavators are known to have two inverters dedicated to separate functions?
Which excavators are known to have two inverters dedicated to separate functions?
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In which scenario does the propulsion motor directly connect to the rear axle assembly?
In which scenario does the propulsion motor directly connect to the rear axle assembly?
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What is the role of HaV cables in the operation of propulsion motors?
What is the role of HaV cables in the operation of propulsion motors?
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What is the purpose of the rotating magnetic field in a three-phase AC power system?
What is the purpose of the rotating magnetic field in a three-phase AC power system?
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How does the pump motor contribute to the machine’s hydraulic systems?
How does the pump motor contribute to the machine’s hydraulic systems?
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What determines the speed and direction of a machine's travel?
What determines the speed and direction of a machine's travel?
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What is a necessary feature of some pump motors for thermal management?
What is a necessary feature of some pump motors for thermal management?
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Which component provides lubrication and cooling for the rotor assembly in the R1700 XE LHD pump motor?
Which component provides lubrication and cooling for the rotor assembly in the R1700 XE LHD pump motor?
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What are the two primary assemblies that make up a pump motor?
What are the two primary assemblies that make up a pump motor?
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Which of the following statements about the pump motor's design is accurate?
Which of the following statements about the pump motor's design is accurate?
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What is the function of the output transfer gear box in the propulsion module?
What is the function of the output transfer gear box in the propulsion module?
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What role does the Master Battery Management Module (MBMM) serve in the battery control compartments?
What role does the Master Battery Management Module (MBMM) serve in the battery control compartments?
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Which ECM specifically manages the functions of the inverter and DC/DC converter in the R1700 XE LHD?
Which ECM specifically manages the functions of the inverter and DC/DC converter in the R1700 XE LHD?
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What additional functions does the Machine ECM in the 301.9 MiniHEX provide besides monitoring the inverter?
What additional functions does the Machine ECM in the 301.9 MiniHEX provide besides monitoring the inverter?
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Where is the Electric Drive ECM located in the 906 CWL?
Where is the Electric Drive ECM located in the 906 CWL?
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What type of system does the Battery ECM specifically manage in both battery control compartments?
What type of system does the Battery ECM specifically manage in both battery control compartments?
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Which of the following is NOT a function of the Electric Drive ECM in the R1700 XE LHD?
Which of the following is NOT a function of the Electric Drive ECM in the R1700 XE LHD?
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What primary function does the Electric Drive ECM localized in the 906 CWL perform?
What primary function does the Electric Drive ECM localized in the 906 CWL perform?
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In a battery electric machine, which component works alongside the MBMM to control the battery system in the left compartment?
In a battery electric machine, which component works alongside the MBMM to control the battery system in the left compartment?
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What component is used to control the temperature of the battery coolant in the 950 GC MWL?
What component is used to control the temperature of the battery coolant in the 950 GC MWL?
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Which component of the 950 GC MWL battery cooling circuit circulates the coolant?
Which component of the 950 GC MWL battery cooling circuit circulates the coolant?
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How many 600V Battery Packs are supplied battery coolant by the tank in the 950 GC MWL?
How many 600V Battery Packs are supplied battery coolant by the tank in the 950 GC MWL?
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What is the function of the pair of fans in the 950 GC MWL battery cooling system?
What is the function of the pair of fans in the 950 GC MWL battery cooling system?
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What does 'HaV' in R1700 XE LHD stand for?
What does 'HaV' in R1700 XE LHD stand for?
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What is the primary purpose of the dedicated cooling circuit in the R1700 XE LHD?
What is the primary purpose of the dedicated cooling circuit in the R1700 XE LHD?
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What is the purpose of the dedicated cooling circuit in the R1700 XE LHD battery system?
What is the purpose of the dedicated cooling circuit in the R1700 XE LHD battery system?
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Which part of the cooling system provides battery coolant to the 950 GC MWL?
Which part of the cooling system provides battery coolant to the 950 GC MWL?
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Where is the shunt tank located in the R1700 XE LHD battery cooling circuit?
Where is the shunt tank located in the R1700 XE LHD battery cooling circuit?
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What is essential for the 950 GC MWL battery cooling circuit to function efficiently?
What is essential for the 950 GC MWL battery cooling circuit to function efficiently?
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What component directs coolant flow from the holding tank into the battery boxes?
What component directs coolant flow from the holding tank into the battery boxes?
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What role does the heat exchanger play in the cooling system of the R1700 XE LHD?
What role does the heat exchanger play in the cooling system of the R1700 XE LHD?
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What happens to the coolant after it passes through the battery modules in the R1700 XE LHD?
What happens to the coolant after it passes through the battery modules in the R1700 XE LHD?
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What happens to the propulsion motor in retarding mode?
What happens to the propulsion motor in retarding mode?
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Which component is NOT part of the heat exchanger cooling circuit?
Which component is NOT part of the heat exchanger cooling circuit?
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What is the function of the coolant hoses in the R1700 XE LHD battery cooling circuit?
What is the function of the coolant hoses in the R1700 XE LHD battery cooling circuit?
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Which component converts mechanical power from the rotor assembly into electric power?
Which component converts mechanical power from the rotor assembly into electric power?
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What does the PDU receive DC voltage from?
What does the PDU receive DC voltage from?
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Which component initiates the cooling process of the battery system in the R1700 XE LHD?
Which component initiates the cooling process of the battery system in the R1700 XE LHD?
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What is the role of the BMS in the battery system?
What is the role of the BMS in the battery system?
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If the battery modules cannot receive charge, where does the electric power go instead?
If the battery modules cannot receive charge, where does the electric power go instead?
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In the context of the R1700 XE LHD, what is the function of the power inverter?
In the context of the R1700 XE LHD, what is the function of the power inverter?
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What occurs if the battery modules are capable of receiving electric charge?
What occurs if the battery modules are capable of receiving electric charge?
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Which ECM is responsible for the overall management of the HaV electrical system?
Which ECM is responsible for the overall management of the HaV electrical system?
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Study Notes
Global Dealer Learning - Battery Electric Machine Systems
- This module covers the fundamentals of Battery Electric Machine (BEM) systems.
- Caterpillar products are covered, including the R1700 XE, 950 GC, and 906.
- The document provides detailed tables of contents for different modules within the learning program.
- A safety briefing is included, covering emergency numbers, first aid responders, location of exits, fire extinguishers, room alerts, evacuation locations, storm shelters, and hazardous materials.
Purpose
- The purpose of this module is to explain the components of Battery Electric Machine (BEM) systems.
Reason
- Successful completion validates knowledge, skills, and behaviors required to determine the location, function, and operation of BEM system components.
Assessment Criteria
- Knowledge assessment is conducted through a closed-book exam.
- Minimum passing score is 80%.
Learning Outcomes
- Participants will be able to identify BEM system components.
- Participants will be able to describe the function of BEM system components.
- Participants will be able to explain BEM system and component operation.
BEM Systems Overview
- BEM systems utilize stored battery power, discharged through a Power Electronics Module (PEM).
- The PEM connects the battery system to charging systems and HaV electrical systems.
- The illustration shows one battery box of a R1700 XE LHD, the other is located opposite the illustrated one.
Ground Level Service Center
- HaV indicator lamp monitors DC bus voltage, regardless of the low voltage system's battery disconnect switch.
- When hazardous voltage is present, the amber lamp is illuminated.
Electrical Isolation
- HaV components and their housings are electrically isolated to prevent contact with hazardous voltages during servicing.
- Components and their assemblies are sealed to prevent moisture, oil and other contaminants.
Bonding and Grounding Wire System
- HaV components are connected by bonding wires.
- Component housings are grounded to the machine frame using grounding wires.
- All component housings are at the same electrical potential as the machine frame.
Hazardous Voltage (HaV) Cables
- Orange-clad HaV cables are used to convey power to HaV components.
- Stranded stainless steel wire overbraids strengthen cables and provide protection.
- Ground fault detection features protect users and components.
Cat Battery Pack
- Consists of three main components: battery modules, a Power Electronics Module (PEM), and a Battery Management System (BMS).
- Modules are connected in series to increase voltage, or in parallel to extend the time period electric power can be supplied, depending on type.
- The PEM connects the battery modules to the machine's HaV electrical system.
R1700 XE 715 VDC Battery System
- A distinct battery system from other BE machines.
- The HaV junction box acts as both PEM and PDU.
- The battery system supplies 715 VDC to the HaV electrical system.
- It has three main components: a battery pack, HaV junction box, and a BMS.
DC Charging System
- Battery electric machines use a DC charging system.
- The R1700 XE LHD has a charger receptacle box with two DC charger ports for connection to a Mobile Equipment Charger (MEC) unit.
AC Charging System
- Battery electric machines, other than the R1700 XE LHD, have an AC charging system.
- Port types vary by region (Type 1 for US, Type 2 for EU).
- AC voltage is rectified into DC voltage before entering the PDU.
Power Distribution Unit (PDU)
- The PDU distributes electric power from the battery to inverters and DC/DC converters.
- It also supplies power to auxiliary components.
- The R1700 XE LHD and 50V battery pack functionality.
Inverter
- Converts DC voltage to AC voltage for supplying electric power to motors.
Propulsion Motor
- Converts electric power into mechanical power for propelling the machine.
- The type and design of the motor depend on the specific machine model (e.g., 906, 950 GC, or R1700 XE LHD).
Pump Motor
- Converts electric power into mechanical power to drive hydraulic pumps.
- Designs and constructions vary depending on the machine model (e.g., 906, 950 GC, or R1700 XE LHD).
DC/DC Converter
- Converts high-voltage DC to low-voltage DC for powering lower-voltage parts of the BE machine.
Auxiliary Components
- Additional components supplied by PDU may include optional cab heaters, PTC heating elements, A/C compressors, and thermal management systems.
- 301.9 MiniHEX cab heater connects to the 50V battery pack PEM.
Battery System Control
- Two main electronic control systems (BMS and Electric Drive Control System) are part of the battery electric machine systems.
- BMS monitors battery modules, HaV junction boxes, and charging systems, overseeing the charging and discharging of the battery and the function of accompanying components.
HaV Electrical System Control
- Provides monitoring and control of HaV electrical components for different battery electric machine types (e.g., R1700 XE LHD, 301.9 MiniHEX, 906 CWL, 950 GC MWL).
Powertrain Control
- The ECMs responsible for each machine's powertrain oversee all powertrain functions.
Battery System Cooling
- Systems for different models (R1700 XE LHD, 950 GC) control battery temperatures.
HaV Electrical System Cooling
- Cooling systems for different models (R1700 XE, 906 CWL, 950 GC) manage HaV component temperatures.
Motor Cooling and Lubrication
- R1700 XE LHD systems and and similar cooling systems maintain components within the output transfer box.
- Systems employ separate coolant systems to cool and lubricate various parts.
Propulsion Mode
- A mode for power from the battery system to send DC voltage to HaV electrical systems to enable vehicle propulsion.
- Processes in different models (906, 950 GC, or R1700 XE LHD) are examined.
Charge Mode
- A mode to charge Cat battery packs.
- Different models (e.g., R1700 XE, 301.9 and 320, and 906, 950 GC) charging systems are examined.
Retarding Mode
- Systems in different models use the propulsion motor's HaV systems as generators to reduce speed on downhill operation.
- Battery status is checked and components are controlled.
Module Conclusion
- Summary of the BEM system module for use with service manuals.
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Description
This module focuses on the fundamentals of Battery Electric Machine (BEM) systems, specifically within Caterpillar products like the R1700 XE and 950 GC. It includes a comprehensive safety briefing and a knowledge assessment to validate the understanding of BEM system components. Successful completion certifies essential skills and knowledge in operating these advanced machines.
