29 Nov
2014
29 Nov
'14
11:48 a.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of tony
duell
Sent: 29 November 2014 19:46
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: Relay question
motor
I had a 3-Rail Hornby "O" gauge that
used a toggle relay to reverse. I
think rather than over voltage it was set up so the relay had a very
low "hold-in voltage". It had a pawl that drove a commutator shaft
that generated the reversing. I think it was 24volt but might have been
higher....
Sounds like the one I was describing, except that the relay coil was the field winding with the moving pole piece acting as the
relay armature. The
switch was a fibreboard disk with brass contact plates on it and 3 spring
contacts pressing on it. The fourth connection was made via the pivot
screw
to the chassis, then to the wheels and back to the
track. I still have the
motor
unit somewhere, it'll turn up in the next year or
so as I unpack
everything..
IIRC it was 20V AC
-tony
I wosh I still had any of mine, it was FUN!