GM500 relay switches frog wiring?

[mikem1alt]

Not wishing to trust the built in switch on the Seep PM1 motor for changing Frog polarity on the GM500 relay is it just a question of wiring
terminals A B C to motor (all ok on that ) then terminal 1 to Frog (all ok on that ) now terminals 2 and 3 to stock rails, as this is a stand alone switch will it matter what goes where ie positive to either 2 or 3? cant see a short developing here or am I missing a trick?

thanks Mike

[andy1878]

Short answer - yes

You will need to get the relay connections working in sympathy with the switch rails.

Also IMHO the gaugemaster wiring diagram misleads with the drawing of the switch. It must be a centre biased (on)-off-(on)

[mikem1alt]

Thank you for the information I have yet to inspect a G500 they are in the post, so it is best reliant on a meter for continuity set up?

[andy1878]

Instructions here http://www.gaugemaster.com/instructions/gm500instructions.pdf

yep using a meter will assist in getting polarity correct.

Good luck.

[B.Meldon]

If there is a delay in the switching of the point blades then you could get a momentary short. This may not be a problem with most conventional controllers, but could cause an issue with some DCC systems unless the points are modified for DCC operation.  (I.e. blades always connected to the stock rail and an isolated and switched frog.)
It also should be noted that the max rating of the frog relay in the GM500 is 2amp and with a DCC system a short when a loco runs the wrong way through a point frog may well be more than 2amp.
It is just my opinion but you may well find a simple micro switch acting on the point rod or tie bar may be just as effective.
 
Alternatively you could fit your SEEP point motors so they are adjustable to get the switching correct, in fact with the small amount of movement in the 009 point blades I would say that this is essential to have some adjustment get the switching correct with the seep or even with the Peco point motors fitted with the accessory switch.

Brian Meldon