Section 75
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J6 – Digital Inputs 9 – 24
Signals for the digital inputs 1-24 must be in the in the range of +V battery and ground. With
the inputs wired as show (this is the default), they will be active when there is a ground applied
to the respective input. They can be connected to be active when +V battery is applied, but the
connections are different. See Alternate Signal Polarities for the Digital Inputs in the Analog
Inputs section, in this document.
J7 – Analog Inputs and Magnetic Pickup Input
The J7 connector is for analog inputs and the magnetic pickup input. The first 4 analog inputs
have current sources for driving standard resistive senders. For best accuracy, and most noise
immunity, senders should be of the two-wire type, with the return wire coming back to the
appropriate sender ground.
NOTE
: Murphy recommends the use of two wire senders, with the sender
return connected to the analog channel.
If single ended senders are used, with ground provided at the sender itself, there can be a
number of problems that may or may not affect any given installation. Since the sender
body/threads provides sender ground, the use of thread tapes and compounds may give
erratic operation.
Additionally, the grounds may not be completely common between different parts of the
engine, alternator, and skid because there may be ground resistance between parts of the
generator caused by paint, sealing compounds, rust, debris etc., and there always exists a
greatly increased chance for noise and interference to affect the controller operation.
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