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Size: 2862
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| Ideas, comments, stuff - goes here. | === Aims === * redo all internal wiring and logic, except the refrigeration parts * make the machine more safe by doing things properly and reducing the voltage of exposed components * keep the software interface as simple or more simple than before * make the buttons on the front of the machine work for dispense * make it extensible so things can be added on * give the machine a general service where necessary (seals, rust protection, oil) === Draft Bill of Materials === ||Amount||Item||Use||Model||Cost|| ||7||microswitches||front button switches|| || || ||20||microswitches||each slot has double microswitches, there are 10 slots|| || || ||7||5mm round white LED's||replace empty slot globes|| || || ||7||led mounts for empty slot display||may not be needed, depends on how we mount the LEDs|| || || ||7||resistors||empty slot LED protection|| || || ||1||stripboard or veroboard||mount LED resistors|| || || ||10||6 pin connectors||one for each slot actuator unit|| || || ||??||? pin connectors||assorted connections between cables|| || || ||1||manual drop button|| || || || ||1||PLC||brain||FMD88-10|| || ||1||PLC expansion card||additional IO||EXP4040|| || ||50m?||20 different coloured wires||general rewiring|| || || || ||cable ties|| || || || || ||cable loom/heatshrink tube/electrical tape|| || || || || ||terminal blocks|| || || || ||1||can rust proofing spraypaint|| || || || ||1||110V fan to replace 12V case fan|| || || || . http://www.frozencpu.com/cat/l3/g36/c265/s668/list/p1/Fans-AC_115V_Fans-120mm_AC_Fans-Page1.html . http://au.element14.com/honeywell-s-c/v7-5f17d8/micro-switch-pin-plunger-spdt-3a/dp/1796593 (low force microswitches for empty detection) === Internal PLC IO Requirements === * 10x24V DC input for can sensing (would it be worth multiplexing this?) * 7x24V DC input for front door buttons (ditto with the multiplexing question) * 1x24V DC input for manual dispense mode button * 10x?110V? relay outputs (this assumes linear actuators return by themselves) * 7x DC outputs for empty slot display === Process === * empty the machine and bring it into the clubroom. This means everything won't have to be packed up at the end of the day while we're working on it * remove one of the stacks and test a slot actuator to see what it runs off. This determines what hardware we use to drive everything, so we need to know. * purchase all required hardware (PLC, wiring, connectors, switches, etc.) * write software (state machine based programming implemented in ladder logic, ''should'' be quite trivial) * wire up on the bench and test * service the machine. A can of zinc spraypaint wouldn't go astray on some of the rust spots I think. Check all the seals. Oil what needs oiling. Clean what needs cleaning. * install everything into the machine and test |
Aims
- redo all internal wiring and logic, except the refrigeration parts
- make the machine more safe by doing things properly and reducing the voltage of exposed components
- keep the software interface as simple or more simple than before
- make the buttons on the front of the machine work for dispense
- make it extensible so things can be added on
- give the machine a general service where necessary (seals, rust protection, oil)
Draft Bill of Materials
Amount |
Item |
Use |
Model |
Cost |
7 |
microswitches |
front button switches |
|
|
20 |
microswitches |
each slot has double microswitches, there are 10 slots |
|
|
7 |
5mm round white LED's |
replace empty slot globes |
|
|
7 |
led mounts for empty slot display |
may not be needed, depends on how we mount the LEDs |
|
|
7 |
resistors |
empty slot LED protection |
|
|
1 |
stripboard or veroboard |
mount LED resistors |
|
|
10 |
6 pin connectors |
one for each slot actuator unit |
|
|
?? |
? pin connectors |
assorted connections between cables |
|
|
1 |
manual drop button |
|
|
|
1 |
PLC |
brain |
FMD88-10 |
|
1 |
PLC expansion card |
additional IO |
EXP4040 |
|
50m? |
20 different coloured wires |
general rewiring |
|
|
|
cable ties |
|
|
|
|
cable loom/heatshrink tube/electrical tape |
|
|
|
|
terminal blocks |
|
|
|
1 |
can rust proofing spraypaint |
|
|
|
1 |
110V fan to replace 12V case fan |
|
|
|
http://www.frozencpu.com/cat/l3/g36/c265/s668/list/p1/Fans-AC_115V_Fans-120mm_AC_Fans-Page1.html
http://au.element14.com/honeywell-s-c/v7-5f17d8/micro-switch-pin-plunger-spdt-3a/dp/1796593 (low force microswitches for empty detection)
Internal PLC IO Requirements
- 10x24V DC input for can sensing (would it be worth multiplexing this?)
- 7x24V DC input for front door buttons (ditto with the multiplexing question)
- 1x24V DC input for manual dispense mode button
- 10x?110V? relay outputs (this assumes linear actuators return by themselves)
- 7x DC outputs for empty slot display
Process
- empty the machine and bring it into the clubroom. This means everything won't have to be packed up at the end of the day while we're working on it
- remove one of the stacks and test a slot actuator to see what it runs off. This determines what hardware we use to drive everything, so we need to know.
- purchase all required hardware (PLC, wiring, connectors, switches, etc.)
write software (state machine based programming implemented in ladder logic, should be quite trivial)
- wire up on the bench and test
- service the machine. A can of zinc spraypaint wouldn't go astray on some of the rust spots I think. Check all the seals. Oil what needs oiling. Clean what needs cleaning.
- install everything into the machine and test
