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gca125-proto-en [2018/11/12 08:56] (current)
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 +====== GCA125 Interface for motordriven turnouts ======
 +[[english|{{ ​ rocrail-logo-35.png}}]]
 +[[english|Content]] -> [[hardware-en|Hardware]] -> [[hardware-en#​interfaces|GCA]]
 +  *  [[mgv-overview-en|The GCA modules]] ​
 +
 + \\
 +
 +^^^^By Peter Giling ^^^^
 +
 +==== Features and facts ====
 +
 +8 individual inputs, commanding 8 individual outputs
 +
 +600 mA max load per output.
 +
 +Max 42 Volt per output.
 +
 +8 individual inputs.
 +
 +Time selection for output duration.
 +
 +Outputs are activated one by one for power reduction.
 +
 +===== The prototype =====
 +{{:​mgv:​hardware:​gca125_pict01_mk.jpg?​600}}
 +
 +===== Description =====
 +
 +Controlling a LGB 1201, Kato or Fulgurex turnout-drive,​ in fact also some type of Hoffmann turnout motors, only have one coil or motor, that needs to be controlled by polarity.\\
 +Even the Bohler WA2 is very nicely useable with this interface.\\
 +The normal driver like GCA77 is not suitable for that.\\
 +The complexity of this unit is slightly higher.\\
 +In the GCA units, it is standard, to separate the power, needed to activate the coils and the LocoNet system by means of optocouplers.\\
 +This unit is able to control 8 turnouts, and need 8 inputs from the GCA50.\\
 +So 2 units, capable of a total of 16 turnouts, are commanded by 1 GCA50.\\
 +It is also possible to use a switch for direct activation without GCA50. \\
 +You will need a 5-12Vdc to activate the opto-couplers.\\
 +The software in the PIC16F62x is made in such a way that the processor provides a correct timing for the coil, and switch it off after the chosen time.\\
 +This will take care that the turnout coil will not be overheated by too long powering.\\
 +The time selection is done with the Dipswitch.\\
 +The processor in the circuit needs 8 inputs and 16 outputs, and 3 extra for dip-switch reading. \\
 +The smaller PIC processors have only maximum 16 I/O.\\
 +Therefore I used I2C expanders , making a small processor suitable.\\\\
 +
 + 
 +
 +
 +
 +===== The hardware files =====
 +|{{:​mgv:​hardware:​mgv125-sch.pdf|The schematics}} ​  |
 +|{{:​mgv:​hardware:​mgv125-pcb.pdf|The pcb Layout}} ​  |
 +^N.B. Self made pc-boards are not supported! ^
 +
 +===== Cable to MGV50 / CAN-GC2 =====
 +
 +refer to:  ​
 +[[PSK-Interface connections-en|**Connection interfaces**]]
 +
 +===== Firmware =====
 +{{mgv:​hardware:​mgv125.zip|program files}}
 +
 +===== Time delay settings =====
 +SW1 is used to set the delay time after which the output will be swotched off.
 +
 +^ Delay table  ^  ^  ^   ^
 +|  Delay in Sec   ​| ​ SW1 1   | SW 2   ​| ​ SW 3   |
 +|  0.1   ​| ​ Off   ​| ​  ​Off ​  ​| ​  ​Off ​  |
 +|  0.2   ​| ​ Off   ​| ​  ​Off ​  ​| ​  ​On ​  |
 +|  0.4   ​| ​ Off   ​| ​  ​On ​  ​| ​  ​Off ​  |
 +|  0.8   ​| ​ Off   ​| ​  ​On ​  ​| ​  ​On ​  |
 +|  1.6   ​| ​ On   ​| ​  ​Off ​  ​| ​  ​Off ​  |
 +|  3.2   ​| ​ On   ​| ​  ​Off ​  ​| ​  ​On ​  |
 +|  6.4   ​| ​ On   ​| ​  ​On ​  ​| ​  ​Off ​  |
 +|  12.8   ​| ​ On   ​| ​  ​On ​  ​| ​  ​On ​  |
 +
 +===== Remarks =====
 +Inputs, if activated, should remain activated, to keep motor/coil in the chosen position.
 +
 +GCA50 should be programmed as switch, with C2 NOT checked.
 +
 +Checking C2 will inverse action.
 +
 +===== Bill of materials =====
 +^  Qty  ^  Reference ​ ^  Description ​ ^  ​
 +|  8  |  R1..8  |  1 kOhm  |
 +|  2  |  R9,10  |  3.3 kOhm  |
 +|  3  |  R11...13 ​ |  10 kOhm  |
 +|  1  |  RP1  |  8x 10 kOhm SIL-9  |
 +|  1  |  C1  |  1000 uF 35V radial ​ |
 +|  1  |  C2  |  10 uF 35V radial ​ |
 +|  3  |  C3..5  |  capacitor 100 nF  |
 +|  1  |  VR1  |  Power IC 7805 (TO-220) ​ |   
 +|  1  |  U1  |  Processor PIC16F627 or equiv. ​ |
 +|  1  |      |  socket 18Pins for U1  |
 +|  2  |  U2,U3  |  PCF8574 ​ |
 +|  4  |  U4..7  |  L293D (DIL-16) ​ |
 +|  2  |  U8,9  |  LTV847 or equiv. ​ |
 +|  8  |    |  Socket Dil16  |
 +|  1  |  GR1  |  Bridge B80C1500 round  |
 +|  1  |  F1  |  PFRA110 ​ mulitfuse 1.1A  |
 +|  4  |  J1  |   ​AKL012-04 ​ |
 +|  1  |  J2  |  AKL012-02 ​ |
 +|  1  |  SW1  |  dip-switch 3  |
 +
 +
 +
  
gca125-proto-en.txt ยท Last modified: 2018/11/12 08:56 (external edit)