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| + | ====== GCA21 Reverse loop switch for heavy loads (up to 10 Amp). ====== | ||
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| + | [[english|{{ rocrail-logo-35.png}}]] | ||
| + | [[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#interfaces|GCA]] | ||
| + | * [[mgv-overview-en|The GCA Family]] | ||
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| + | \\ | ||
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| + | ^^^^By Peter Giling ^^^^ | ||
| + | \\ | ||
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| + | ===== 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.\\ | ||
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| + | ===== Hardware ===== | ||
| + | | {{:gca:gca21_sch.pdf|Schematic plan}} | | ||
| + | | {{:gca:gca21_pcb.pdf|The pc-board with parts positions}} | | ||
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| + | This is just a preview, objects are liable to changes! | ||
gca21-en.txt ยท Last modified: 2018/11/12 08:56 (external edit)
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