B737NG oil differential pressure switch
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Joined: Jan 2012
Posts: 5
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From: china
B737NG oil differential pressure switch
i have some questions on oil differential pressure switch
the switch has three pins 。pin 1 and pin 2 named SW 1，pin 3 and pin 2 named SW2。
in the CDU ----MAINT---ENGINE ---INPUT MONITORING---OIL SYSTEM
there are SW1 CH A，SW1 CHB。
who can tell me how CHA and CHB come true？the SSM 79-33-11 has no more information abort CHA and CHB of the oil differential pressure switch how to come true in EEC
the switch has three pins 。pin 1 and pin 2 named SW 1，pin 3 and pin 2 named SW2。
in the CDU ----MAINT---ENGINE ---INPUT MONITORING---OIL SYSTEM
there are SW1 CH A，SW1 CHB。
who can tell me how CHA and CHB come true？the SSM 79-33-11 has no more information abort CHA and CHB of the oil differential pressure switch how to come true in EEC
Joined: Feb 2011
Posts: 10
Likes: 0
From: Europe
I can't figure out what answer you are looking for?
This is the normal logic(other states can be found);
SW1 CHA & CHB CLOSED and SW2 CHA & CHB OPEN = "not clogged"
SW1 CHA & CHB OPEN and SW2 CHA & CHB CLOSED = "clogged"
Seems like the two switches sends their respective signals to BOTH EEC channels and for this you only need three pins.
This is the normal logic(other states can be found);
SW1 CHA & CHB CLOSED and SW2 CHA & CHB OPEN = "not clogged"
SW1 CHA & CHB OPEN and SW2 CHA & CHB CLOSED = "clogged"
Seems like the two switches sends their respective signals to BOTH EEC channels and for this you only need three pins.
