OIL LEVEL

• 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 open when the oil level falls below a minimum critical
        value.
2)    Oil temperature sensor A7S2, which open when 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, see figure 11-7 sheet 18) at bubble 1883-10.
 

SIGNAL DESTINATION


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See figure 11-7 sheet 10,  A7TB2  28 volts is present at bubble 1883.  A7S1 a normally open switch, its held shut when the oil level is correct.  The OILLEVEL signal is  normally high, and it's low when a fault occur.  The fault condition is  placed on the Fault Bus at Port04EN- as Transmitter Data (TDATA), it is also exit bubble 1003-11 to remove Transmitter Available at 1003 (see figure 11-7 sheet 11).  The signal OILLEVEL-- is sent to the Fault Display Panel A1A1 via bubble 1012-1.   At bubble 1012 (see figure 11-7 sheet 1) signal OILLEVEL- goes out to light the Oil Level lamp.
 

LIMITS AND FAULTS


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 Oil level sensor A7S1, opens when the oil level falls below a minimum critical level.
 
 

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