RE: Electrical relays

[ian.bird@xxxxxxx]

Next I guess is to put the relay in the circuit and make sure the thing
works. Use a different power source and make sure when applied across the
trigger contacts the relay both clunks and the contacts close. If the
motor does not turn over then check back and see what has failed to
happen.

If it does turn over then the power to the trigger coil is probably not
enough/wrong voltage. Will the inverter allow enough current to flow and
at the correct voltage to energise the relay? Some car relay coils can
take quite a kick to energise them.

Ian








"Benfield, John" <john.benfield@xxxxxxx>
01/12/2003 12:27
Please respond to ukha_d


To:     "'ukha_d@xxxxxxx'" <ukha_d@xxxxxxx>
cc:
Subject:        RE: [ukha_d] Electrical relays


>I think some more investigation as to why it is not working is needed.
Ask
questions like
>What is the current flow across the contacts made by the key

I'll try and measure that again.

>How thick is the wire as the thicker it is means the more current may
flow

The wire is 1mm, therefore (relatively) low voltage/current. I've put in
5A
in-line fuse on the circuit and that's okay.

>Once you know this think about what would happen if a relay was used
and
>the contacts welded closed i.e. like leaving the key permanently on.
Make

>some provisions to get round this and you are getting close to finding
a
>solution.

The inverter is handling the timing of the circuits, but it is basically
duplicating the manual sequence. Once I have it working I will configure
the
actually timing more accurately. The sequence is pre-heat on, wait for 10
seconds, start on (hold for 5 seconds), start off (this is like letting go
of the key), if no voltage is found on the supply side, then turn the
pre-heat off, wait for 15 seconds and repeat. If voltage is found, then
leave the pre-heat on. To turn the genny off, break the pre-heat circuit.

>Assuming these are OK you can start to look for a relay.

I thought I had everything sussed, that when I went a got the relay.
However, things are obviously not has they appear.







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