gca208-en
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| - | ====== GCA207/208 Central stion switch panel ====== | ||
| - | {{ : | ||
| - | [[english|{{ | ||
| - | [[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en# | ||
| - | * [[mgv-overview-en|The GCA modules]] | ||
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| - | \\ | ||
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| - | ^^^^By Peter Giling ^^^^ | ||
| - | \\ | ||
| - | ===== Description ===== | ||
| - | Probably all modelrailroad clubs are struggling with this delemma: \\ | ||
| - | How can we safely switch from one system tot another on the test layout, without troubling\\ | ||
| - | with connectors, screw terminals, loose wires, etc.?\\ | ||
| - | We were facing the same problem and since we would like to install a new table for testing loks,\\ | ||
| - | I created this GCA207 / GCA208 combination.\\ | ||
| - | The picture on the right hand side whows the result, satisfying anybody in our club who has something to do with maintenance and decoder assembling.\\ | ||
| - | |||
| - | So far we had these option on our wish list:\\ | ||
| - | * ESU DCC programming unit, with a testboard for decoder connection. | ||
| - | * Marklin Gleisbox with Mobile Station 2 | ||
| - | * Sprog 3 for use with JMRI | ||
| - | * External connection for anyone who would like to bring his/her own central station | ||
| - | * Marklin' | ||
| - | * dc current transformer. | ||
| - | |||
| - | Futher more on this table needed: | ||
| - | * a computer so we could install: | ||
| - | | ||
| - | | ||
| - | | ||
| - | (not understandable, | ||
| - | * roller bar | ||
| - | * a few rails in different scale | ||
| - | * a switch to change rollerbank and K-rail between two and three rail function. | ||
| - | |||
| - | Well, that demanded many connections, | ||
| - | that somebody was making a mistake, with or without purpose.\\ | ||
| - | So I made unit GCA208 and a control panel GCA207.\\ | ||
| - | The boards belong to each other.\\ | ||
| - | All rails are connected together, except roller bar and K-rail which have a separate 3-wire connection.\\ | ||
| - | There are a total of 7 push buttons for selection of various tasks.\\ | ||
| - | All central station and transformers are connected to the relay board, and will,be swiched\\ | ||
| - | in such way, that there is no possibility to connect two or more central stations/ | ||
| - | That was the first and major task for this relay board.\\ | ||
| - | 6 buttons are for selection of various functions, and 1 button for selection between 2- and 3rail.\\ | ||
| - | The relays are all Double Pole Double Task type OMRON G2R-2 24 V coil.\\ | ||
| - | This assures that relays can easily handle the maximum currents of anything that is connected.\\ | ||
| - | The total system is also provided with a dc controller (with incremental switch, no potentimeter!).\\ | ||
| - | Controller adjusts the dc output (if selected) between 2 and 16 Volt,\\ | ||
| - | very convenient for checking motors of locs. before a new decoder is connected.\\ | ||
| - | Futher more, a volt and amp meter is integrated in the system, which makes testing of motors very convenient.\\ | ||
| - | \\ | ||
| - | To avoid a lot of wires between front and relayboard, connection is made via I2C, so only for 4 wires are needed\\ | ||
| - | for all teds, incremental and push buttons.\\ | ||
| - | The relay board contains a microprocessor whitch is taking care for all decisions, and also makes it impossible to activate two selections at the same time.\\ | ||
| - | Control of dc output to rails is done by a PWM output from processor, but this PWM is filtered before it reaches the regulator, so there will be no ripple on dc output.\\ | ||
| - | This is important because some decoders can be damaged by PWM power, or at least show some unexpected reactions\\ | ||
| - | Since this regulator is not able to produce less thee 1,25V, the processor will switch dc off when regulator is set below 2V.\\ | ||
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| - | ^ Hardware | ||
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| - | \\ | ||
| - | All boards and/ or complete kits are available if there is any interest\\ | ||
| - | Just ask [[peter.giling@rocrail.net|Peter]] | ||
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gca208-en.1581774615.txt.gz · Last modified: 2020/02/15 14:50 by phg