User Tools

Site Tools



This shows you the differences between two versions of the page.

Link to this comparison view

gca21-en [2018/11/12 08:56] (current)
Line 1: Line 1:
 +====== GCA21 Reverse loop switch for heavy loads (up to 10 Amp). ======
 +[[english|{{ ​ rocrail-logo-35.png}}]]
 +[[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#​interfaces|GCA]]
 +  *  [[mgv-overview-en|The GCA Family]] ​
 + \\
 +^^^^By Peter Giling ^^^^
 + \\
 +===== This page is under development. =====
 +===== Description =====
 +Bsed on the use of GCA102, which already have been used many times, and still is, \\
 +there was a need for something more useful for large current like G-Track or track 1.\\
 +Also because of the more and more getting popular use of hall sensors, this unit is provided with connections for only that.\\
 +The on-board relays can switch up to 10 Amp, so that would be enough for one train.\\
 +The basic idea was to use it together with GCA179 for hall sensors,\ but the plan is going\\
 +to change to the option of having connections directly for hall sensors.\\
 +Additionally it is possible to use GCA194 current detector to connect to this unit.\\
 +Four hall sensors are needed, one sensor at each side of the railcut, and that at both sides of the loop itself.\\
 +These pairs of halls ensors could be connected parallel, making less wiring necessary.\\
 +The input is made in a way that longer lines are possible, and unlike GCA102, the unit does not\\
 +provide extra sensor inputs for use as feed-back for blocks.\\
 +This is mainly because the complete unit is powered by the digital rail power itself.\\
 +Hall sensors are able to work with max 18 Volts, so an extra regulator IC3 was needed to achieve 12Volt for the free hall sensor circuit.\\
 +Because it is important to maintain the position of the relays, (on should always be ON),\\
 +the processor stored the last position in eeprom, so when rail power is shortly OFF and comes back ON , the correct situation of relays will reassured.\\
 +Instead of using the railpower, it also possible to supply with a 24 V dc (+/- 100 mA).\\
 +In that case, do NOT assemble the bridge rectifier B1.\\
 +  ​
 +===== Hardware =====
 +|  {{:​gca:​gca21_sch.pdf|Schematic plan}} ​ |
 +|  {{:​gca:​gca21_pcb.pdf|The pc-board with parts positions}} ​ |
 +This is just a preview, objects are liable to changes!
gca21-en.txt ยท Last modified: 2018/11/12 08:56 (external edit)