Hmmmm...
Try this. It is about as simple as it can be I
think to do the job (I hope).
Use a SPST relay connected to the incoming single
wire (A), the coil connected through a diode, for
example so that only negative polarity can flow to
the relay coil.
Take off a wire (B) before this diode, this will
be used later.
The SPST relay contacts are connected such that an
incoming wire to the points is pos (wire C). This
feeds the single connection on the other side (E)
when the relay energizes, so if the relay is
energized, this output wire becomes pos, if it is
not energized it will 'float' (no voltage).
The single connection on the relay (E) is used in
conjunction with the wire taken before the diode
feeding the coil, wire (B), these two wires form a
pair (E and B) with outputs that will be used to
control the latching relays.
The result should be that if the single incoming
wire A is neg, the single wire coming from the
relay E is pos and if A is pos, E 'floats' (no
volatge).
Now with E and B you have a set of wires that can
be either -,+ or +,0, depending on whether or not
the single wire A is pos or neg polarity.
Connect these wires E and B through diodes to the
latching relay coils which are connected so that
each relay has a coil connected to the other
relays opposite function, one diode from E or B to
each set of coils, the diodes connected opposite
polarities from each other.
Make sure that E and B and their diodes are
connected so that the 'float' condition on one of
the set of wires (remember the input to the
latching relay coils will be -,+ or +,0) will
occur when those latching relay functions should
be de-energized anyway.
The result should be that when the incoming single
wire is one polarity, one set of the two sets of
dual outputs (-,+ or +,0) is achieved via the
function of the SPST relay set up, and that set of
outputs will cause one relays function to energize
and the others relays opposite function to energize.
If the incoming single wire has the opposite
polarity, the reverse set of outputs is achieved
from the SPST relay (say +,0 instead of -,+) so
the latching relays will have the opposite set of
coils energized than before.
If the single incoming wire A 'floats' then the
output of the SPST relay set up should be (0,0)
since the SPST relay outputs nothing if not
energized and the SPST relays output is wire E,
wire B coming from A it will be of course be
'floating' or 0, so both will be 0.
This would mean that no current would flow through
the latching relay coils when the single incoming
wire is in a 'float' condition. The relays should
remain in the last 'latched, unlatched' condition.
Since the coils of the latching relays have
blocking or steering diodes in their path, the
coils will not conduct if the wrong polarity is
applied, or if zero volts ('float' condition) is
applied to one set of coils and a voltage applied
to the other set of coils.
That should isolate them from each other so no
current flows between the two sets of relay coils
when the single incoming wire (A) 'floats' or at
any other time.
I *THINK* this would work.
Might want to have a schematic, huh? If so I'll
draw one up.-Ken
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