Battery Charger
describe the function of the battery charger
The function of the Battery Charger is to convert the available AC voltage to the DC voltage required to charge and maintain the cars batteries and power the car’s DC loads
What mechanical heat indicator feature is supplemented by an on-board electronic hot journal bearing detection system? Also referred to as a temperature sensitive variable resistor.
Thermistor
State the specific difference between Amfleet I and Amfleet II doors
Amfleet I: 4 electric side doors
Amfleet II: 2 manual side doors
Describe the basics of refrigeration
cooling by removal of heat
The battery box is divided into two sections; name them.
magnetic and electronic housing
Which pin of the 27 point communication cable transmits a Hot Journal Detection signal to the locomotive?
#21
Briefly describe what each limit switch does in regards to the operation of the doors.
LS1, LS2 and LS3
LS1: Completes the door closed signal light circuit
LS2: Door close time delay cut-out
LS3: Energizes the opening cushioning resistor
which component of the compressor does this feature?
a mechanical device that increases the pressure from the low side to the high side of the system
The compressor
If the input or output circuit breaker trips and is caused by a bridge failure, how should you repair the issue?
test bridge diodes and SCR's and replace as required
What is the primary function of the HBD Unit?
monitors the temperature of the eight wheel bearings of the car via sensors located at each wheel bearing and to provide a total warning system in the event of a fault within itself or within any or all of the bearing sensors
What four main door components should you inspect for proper operation?
(1)Press and kick plates.
(2) Obstruction sensors.
(3) Doors fully open and close without binding.
(4) End doors stay in the open position for approximately
15 seconds.
Name the three types of Amtrak employees who fall under hours of service
A dispatching service employee, a signal employee and a train employee.
The output current of the charger is designed to reach a current limit of how many amps?
45 amps
whenever the MGS unit detects a slide condition, which coil is activated to shut off any additional brake cylinder pressure to that truck?
BV Coil
The inflatable door seal should be set to inflate the door seals to how many psi?
12 psi
An employee who participates in deliberately making a false entry constitutes what type of punishment?
felony; imprisonment
If the charger will not turn on or there is a low battery voltage due to a transformer failure, how would you repair this issue?
Check the power secondary voltage. At the bridge it should measure approx. 75VAC. The control secondary, at TB103, should measure approx. 14VAC. Replace charger if required.
The air gap between the speed sensors are critical in proper system operation. How many inches should the gap read?
0.032 inches
Which limit switch would I consider repairing if the door panel opens too fast OR to slow?
LS3 switch
describe a commingled service
When an employee performs covered service during a 24-hour period, any other service performed during that period is also counted toward the computation of on-duty time.