Re: Electrical relays

[ian.bird@xxxxxxx]

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
How thick is the wire as the thicker it is means the more current may flow
Assuming these are OK you can start to look for a relay.

also
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.

Not sure how you are powering these as I have never used a battery
inverter.

Ian






"Benfield, John" <john.benfield@xxxxxxx>
01/12/2003 10:28
Please respond to ukha_d


To:     "HA (E-mail)" <ukha_d@xxxxxxx>
cc:
Subject:        [ukha_d] Electrical relays


Need a bit of help with souring an electrical replay.

I have a small diesel generator that I wish to control remotely. I have
probed the existing key barrel and have determined which wires need to be
connected to a) pre-heat the plugs and then b) start the generator. If I
connect the wires locally, the genny fires no problem. When I attach the
length of control wire that I need (50m), the pre-heat works but the start
doesn't. Even attaching a small length of wire (5m) to the start pins it
doesn't start.

I guessed that I might need a relay located in the generator so that the
length of wire in the start circuit is small. Did a bit of Heath Robinson
at
the weekend and got a generic 30A car relay. However this doesn't seem to
want to work either. I've actually got an battery inverter doing the
controlling of the two circuits, but I guess that the small amount of
power
it is putting down the cable is not enough to trigger the relay (again,
the
pre-heat works fine with no relay).

I had a look at the RS web site, but it listed five pages of relays, and
not
being and electrical type got very confused. Has anyone got any ideas of
the
type of relay I need?

JB




The Royal Bank of Scotland plc, Registered in Scotland No. 90312.
Registered Office: 36 St Andrew Square, Edinburgh EH2 2YB

The Royal Bank of Scotland plc is authorised and regulated by the
Financial Services Authority and represents The Royal Bank of Scotland
Marketing Group. The Bank sells life policies, collective investment
schemes and pension products and advises only on the Marketing Group's
range of these products and on a With-Profit Bond produced by Norwich
Union Life (RBS) Limited.

This e-mail message is confidential and for use by the addressee only. If
the message is received by anyone other than the addressee, please return
the message to the sender by replying to it and then delete the message
>from
Bank of Scotland plc does not accept responsibility for changes made to
this message after it was sent.

Whilst all reasonable care has been taken to avoid the transmission of
viruses, it is the responsibility of the recipient to ensure that the
onward transmission, opening or use of this message and any attachments
will not adversely affect its systems or data. No responsibility is
accepted by The Royal Bank of Scotland plc in this regard and the
recipient should carry out such virus and other checks as it considers
appropriate.




UKHA 2004: 15th and 16th May 2004

http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx
Subscribe:  ukha_d-subscribe@xxxxxxx
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx
List owner:  ukha_d-owner@xxxxxxx

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/






[Non-text portions of this message have been removed]