GCA107 Multi purpose Relay board

ContentHardwareGCA


By Peter Giling


Description

There are quite a few situations, where we need to switch AC.
Most will have to do with just using a transformer for powering a turnout, mechanical signal or decoupler.
GCA76 and GCA77 are suitable to switch these units, but only with DC.
Also to be able to switch a frog on a turnout, a relay is mostly the only way to do it in a reliable way.
Relayboard GCA137 is made for that purpose only, but it will not suit the GCA-PIxx Raspberry units.
The relay board as presented here, is a more universal module.
It contains 8 relays, which can be used for various situations.

  • 4 pairs of relays to switch 4 turnout frogs. Relays are switching the railpower, which is also AC in digital systems.
  • 4 pairs of relays to switch turtoise or hoffmann turnout drives, also switching ac.
  • 8 individual relays to switch anything you can think of, as long as it is no more than 42 Volts and/or 1 ampere.


Selection of different tasks is made by a set of 5 jumpers with each pair of relays.
The maximum current demand for this board with all relays activated = 240 mA.
In most situations only have of the rlays are switched on, with pulse output almost none.
It should be considered with this the total current, that a voltage regulator on either CAN-GC2 board or GCA50 shpuld be able to handle that..
Be sure on these boards that 5V regulator IC is mounted with nut in between pc-board and IC, to improve cooling.
This is also mentioned on the partslist.
If it is used with GCA_PI02, it needs an adequate supply like GCA_PI06.


Professional made boards are available.
Single boards or complete kits. See GCA


The assembled board

gca107_jumpers.jpg

Hardware

The schematics
The pcboard and parts positions
Bill of materials
N.B. Only complete ordered kits will be supported!


Jumper settings

Each pair of relays can have different tasks either together or standalone, selectable by jumpers.
To select a task, use these diagrams.

Task relays 1+2 Jumper connections
JP1 JP2 JP3 JP4 JP5
Turnout frog switches yes no pos 2 no yes Connect frog to J1 pt 2
Railpower to RP1
Left on picture above
2 relays for turtoise turnout yes yes pos 1 yes no connect Motor to J1 pt 2+3
Power to RP1
2 relays for Märklin turnout drive yes no pos 1 no no trafo brown connect to R Turnout drive connections :
yellow to trafo yellow
blue(1) to J1 Pt2
blue(2) to J1 Pt3
2 individual relays no no no no no Relay 1 connect J1 pt 1+2
Relay 2 connect J1 pt 3+4


Task relays 3+4 Jumper connections
JP11 JP12 JP13 JP14 JP15
Turnout frog switches yes no pos 2 no yes Connect frog to J2 pt 2
Railpower to RP1
2 relays for turtoise turnout yes yes pos 1 yes no connect Motor to J2 pt 2+3
Power to RP1
2nd from left on picture above
2 relays for Märklin turnout drive yes no pos 1 no no trafo brown connect to R Turnout drive connections :
yellow to trafo yellow
blue(1) to J2 Pt2
blue(2) to J2 Pt3
2 individual relays no no no no no Relay 3 connect J2 pt 1+2
Relay 4 connect J2 pt 3+4


Task relays 5+6 Jumper connections
JP21 JP22 JP23 JP24 JP25
Turnout frog switches yes no pos 2 no yes Connect frog to J3 pt 2
Railpower to RP1
2 relays for turtoise turnout yes yes pos 1 yes no connect Motor to J3 pt 2+3
Power to RP1
2 relays for Märklin turnout drive yes no pos 1 no no trafo brown connect to R Turnout drive connections :
yellow to trafo yellow
blue(1) to J3 Pt2
blue(2) to J3 Pt3
2 individual relays no no no no no Relay 5 connect J3 pt 1+2
Relay 6 connect J3 pt 3+4
3rd from left on picture above


Task relays 7+8 Jumper connections
JP31 JP32 JP33 JP34 JP35
Turnout frog switches yes no pos 2 no yes Connect frog to J4 pt 2
Railpower to RP1
2 relays for turtoise turnout yes yes pos 1 yes no connect Motor to J4 pt 2+3
Power to RP1
2 relays for Märklin turnout drive yes no pos 1 no no trafo brown connect to R Turnout drive connections :
yellow to trafo yellow
blue(1) to J4 Pt2
blue(2) to J4 Pt3
2 individual relays no no no no no Relay 7 connect J4 pt 1+2
Relay 8 connect J4 pt 3+4
right on picture above



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