190303I Flashcards
True or false: Final drives provide a final overdrive?
False, the provide a final reduction
What are the three gearing configurations a final drive can have?
Pinion & Bull gear set
Planetary gear sets
Chain drives
**Can be a combination of all three
What is the number one advantage of a chain final drive?
Inexpensive to make compared to the other options
Is ground clearance able to be increase or is it decreased with a chain drive?
Ground clearance is increase
Can planetary final drives be mounted on a steering axle?
Yes
What are the advantages of electric drive?
Direct drive can be achieved There is no wait for power Fewer mechanical components Can retard equipment well Consume less oil
What are some major disadvantages of electric drive?
Cost
Heavier than mechanical
Control of torque
Is electric drive AC or DC?
AC, DC gets converted to AC
The main control group can also be called?
Brain and Nerve center
How many phases does the AC drive generator typically have?
3 Phase
Why can a electric drive system be considered dangerous even after shut down?
DC bus voltage can reach over 2000 V DC
What is a VFD?
Variable Frequency Drives
What does PWM stand for?
Pulse Width Modulation
Why do we need to use air to cool off electric drive components?
With that much electricity being produced it will create a lot of heat
Can electric dynamic brake systems be the only brake system on a piece of equipment?
No, there must be service brakes
What is the purpose of a capacitors in relation to an electric drive?
Capacitors filter and store DC bus voltage as well as absorb transient DC voltage spikes
What types of gloves need to be worn when removing compartment covers for high-voltage sections of the power inverter cabinets?
Rubber gloves (that meet rating) and a leather glove over top to protect rubber gloves
What drives the main blower fan?
Driven by the 3 phase AC motor
If wearing PPE how far away must you be from a conductive component until voltage is confirmed to be at a safe level?
30.2 cm or 12 inches
If you are not wearing any PPE how far away do you need to be from conductive components?
0.8 m or 2.5 ft
Describe Bull gear
Bull gear is the largest output gear
How many types of reduction are available in the final drive?
single, double, triple reduction
Final drive brakes are usual what style?
Wet, multi disc styled brakes
