OIL TEMP

• BACKGROUND
• SIGNAL SOURCE
• SIGNAL DESTINATION
• LIMITS AND FAULTS

 

 
 
 

BACKGROUND


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To maintain the oil at safe operating temperatures oil pump HP1 circulates the oil through the heat exchanger.  The heat exchanger is positioned over one of the four plenum exhaust ports and is cooled by air from cabinet blower B3.  Two sensors (see figure 11-10) are mounted on the oil tank:
1)    Oil level sensor A7S1, which opens when the oil level falls below a minimum critical
        value.
2)    Oil temperature sensor A7S2, which opens the oil temperature is between 178 deg. F
        (81 deg. C) and 189 deg. F (87 deg. C).
 

SIGNAL SOURCE


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The signal source is +28 volts from PS3 (28 volt Power Supply as seen on figure 11-7 sheet 18) at bubble 1882-10.
 

SIGNAL DESTINATION


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See figure 11-7 sheet 10,  A7TB2  28 volts is present at bubble 1882.  A7S2 a normally close switch, which open when the oil temperature is between 178 deg. F and 189 deg. F.  Therefore signal OILTEMP is normanally high, and it goes low in a fault condition.  This fault condition is place on the Fault Bus at Port04EN- as Transmitter Data (TDATA), it is also exit bubble 1033-11 to remove Transmitter Available at 1003 (see figure 11-7 sheet11).  The signal OILTEMP-- is sent to the Fault Display Panel A1A1via bubble 1011-1.  At bubble 1011 (see figure 11-7 sheet 1) signal OILTEMP- goes out to light the Oil Temp lamp.

LIMITS AND FAULTS


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 Oil temperature sensor A7S2 opens when the oil temperature is between 178 deg. F
 (81 deg. C) and 189 deg. F (87 deg. C).
 

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