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nuckolls.bob(at)cox.net
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 Posted: Sun Dec 09, 2007 1:16 pm Post subject: Z-19/RB Eng Bat (2-10) switch unused in On postion? |
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At 09:53 AM 12/9/2007 -0800, you wrote:
| Quote: |
I'm confused about the wiring for the "Eng Bat (2-10)" switch depicted in
the Z-19/RB architecture diagram. Please help me to understand.
Here is what I read this switch wiring to be:
Pin 1: Connected to Pin 5
Pin 2: Feed to energize Engine Battery contactor
Pin 3: Open
Pin 4: 12 volts input
Pin 5: Connected to Pin 1
Pin 6: Ground
I can see how the switch will provide 12 volts to the Engine Battery
Contactor in the up "Auto" position, but I don't understand how this switch
(in this wiring configuration) will provide 12 volts to the Engine Battery
contactor in the center "On" position.
To test, I have connected Pin 1 to Pin 5. Then with a continuity test
function on my Auto Ranging Multimeter, I test for continuity between Pin
4 and Pin 2 with the switch in the center On position, and also in the up
Auto position. I only receive continuity in the up Auto position.
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the 2-10 switch is a progressive transfer device
where with the switch full down connections are
2-3 and 5-6. When you move the switch to the mid
position, only one side changes to connect 2-1. The
other side is still 5-6. In the full up position,
the other switch moves to connect 5-4 with 2-1
still connected. So with 1 and 5 connected externally,
the 2-10 forms a single pole, three position switch
with the "COM"mon at terminal 2.
So, with the switch at OFF (full down) terminal
2 connects to 3 which is not connected, hence the
battery contactor is OFF. Moving to the mid position
connects 2-1, 5-6 thereby grounding the battery
contactor coil and manually energizing it. In the
full up position, connects 2-1, 5-4 which gives
control of the battery contactor over to the Aux
Battery Management Module. The ABMM will pull
terminal 4 to ground if and only if the bus
voltage is sustained above 13.0 volts, i.e.
the alternator is running.
If the alternator quits or is shut down for any
reason, the bus voltage quickly drops below 13.0
volts and the ABMM immediatly and automatically
opens the aux battery contactor thus isolating it
from the rest of the system. In this condition,
only those devices fed from the Aux Battery Bus
receive aux battery power.
Bob . . .
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n707sm
Joined: 07 Jun 2007
Posts: 6
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