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SHUTTLE CAR
SHUTTLE CAR
SHUTTLE CAR
SHUTTLE CAR
SHUTTLE CAR
100
What is the SOL relay used for?
Controls the automatic emergency brake
100
Can the pump motor contactor coil be energized when the foot switch is in any position except off?
NO
100
What is the function of the 3 ohm resistor in the logic box protection circuit?
Limits short circuit current to 40 amps in the control circuit (I = 120 volts divided by 3(horseshoe) = 40a)
100
The LC overcurrent coil is preset to activiate LC mercury tube when 7 amperes flows through the coil for 80 milliseconds. How will this protect the logic box?
Opens LC tube; de energizes pump coil; opens pump aux.; removes power from the control circuit
100
With the pump traction contactor closed, what will be energized in the power circuit?
Pump motor and primary of the traction transformer
200
Where are the traction overloads located on the print?
Series with trans. primary
200
Where are the traction overload contacts located?
Series with the pump coil
200
Between what two leads would you connect your ohmeter in order to test the continuity of the series field on the left traction motor?
S1 & S2
200
The ACC1 contactor steps out how many ohms of resistance?
.471 ohms
200
When the foot switch is moved from the off position to the first point position, to what terminals of the logic box is power applied and what coils can be energized at the time? Will the car tram at this time?
Power is applied to #10 and the FORW and BR coils will be energized. NO the car will not tram.
300
What coils are energized when the foot switch is moved to the second point forward position? (the traction switch is in the slow position
C, ACC1 and ACC2
300
How much voltage is applied to the traction motors at this time?
160 volts DC
300
What type of secondary connections do we have o nthe tram circuit transformer at this time?
Delta
300
What type of tram motors are these and why are they started through a resistor?
series would for protection, limits inrush current
300
With the traction switch in the fast position and the foot switch in the second point forward position what tram contactors will be energized?
(FORW. & BR) ACC1, ACC2, S (D de-energizes)
400
How much voltage will be applied to the tram motors at the time?
275 v DC
400
What type of secondary connnections do we have on the transformer at this time?
Star
400
What causes the D contactor coil to become de-energized on second point fast?
R-S interlock in the logic box
400
What happens to the N.C. "D" contacts in series with the "S" coil when "d" coil becomes de-energized?
The "D" contacts close
400
The CR overloads are activated by how many amperes?
90 amperes
500
Where are the CR control contacts physically located?
In the CR relay
500
What happens when the CR relay contacts close?
The car is locked in its direction of travel and the long timing delay sequence kicks in
500
Can the car be trammed during an overload of 90 amperes in the traction circuit?
Yes
500
What deactivates the CR relay?
Tram motor current drops below 45 amps.
500
Assuming "D" coil fails to energize, is it possible for "ACC1" coil to become energized?
Yes