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Size: 4197
Comment:
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Size: 4215
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 28: | Line 28: |
| ||2||http://www.diytools.com.au/MOTOSPRAY-Silva-Gal--Pressure-Pack-400g.html|| recoating everything|| ||$12 || | ||2||galvanising paint|| recoating everything|| http://www.diytools.com.au/MOTOSPRAY-Silva-Gal--Pressure-Pack-400g.html ||$12 || |
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 |
Unit Cost |
7 |
microswitches |
front button switches |
|
|
20 |
microswitches |
each slot has double microswitches, there are 10 slots, 0.15N |
http://au.element14.com/honeywell-s-c/v7-5f17d8/micro-switch-pin-plunger-spdt-3a/dp/1796593 |
$3.60 |
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 |
EXP1616R |
|
42m |
5 core wire, 1mm minimum diameter (to carry 2A) |
actuator and empty switch wiring |
http://www.ebay.com.au/itm/5-Core-Cable-Wiring-Wire-Trailer-Parts-Lights-per-Meter-/110609219198 |
$1.55/m |
8m |
9 core wire |
front buttons and lights wiring |
http://www.ebay.com.au/itm/0-5mm-9-Core-Irrigation-Cable-per-metre-/300341913942 |
$2.15/m |
|
cable ties |
|
|
|
|
cable loom/heatshrink tube/electrical tape |
|
|
|
|
terminal blocks |
|
|
|
2 |
galvanising paint |
recoating everything |
http://www.diytools.com.au/MOTOSPRAY-Silva-Gal--Pressure-Pack-400g.html |
$12 |
3 |
110V fan to replace refrigeration fans |
|
|
|
http://www.frozencpu.com/cat/l3/g36/c265/s668/list/p1/Fans-AC_115V_Fans-120mm_AC_Fans-Page1.html
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=170619406538 (if it's big enough)
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
Measured things
- Can drop process: 400ms on, 500ms off, 660ms on, 300VAC peak-to-peak, 1.8A
- Wire lengths:
- Actuator units 0,1,2,3: 80cm actuator to wire harness, 210cm harness to corner of machine door, 40cm up door, 45cm across, 40cm up to terminal block (4-core minimum) (16.6m)
- Actuator units 4,5: 80cm actuator to wire harness, 170cm harness to corner of machine door, 40cm up door, 45cm across, 40cm up to terminal block (4-core minimum) (7.5m)
- Actuator units 6,7,8,9: 80cm actuator to wire harness, 140cm harness to corner of machine door, 40cm up door, 45cm across, 40cm up to terminal block (4-core minimum) (13.8m)
- Buttons: 75cm across front of door, 60cm down edge of door, 45cm across, 40cm up to terminal block (8-core minimum) (2.2m)
- Lights: 75cm across front of door, 60cm down edge of door, 45cm across, 40cm up to terminal block (8-core minimum) (2.2m)
