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| Additional efforts are being made for us to be able to ‘log’ roasts as temperature over time graphs, in order to compare roast profiles for individual beans and measure outcomes. | | Additional efforts are being made for us to be able to ‘log’ roasts as temperature over time graphs, in order to compare roast profiles for individual beans and measure outcomes. |
| + | |
| + | == Operation Checklist == |
| + | |
| + | * Get stuff ready: |
| + | ** Get hopper, funnel, bags from Kitchen |
| + | ** Weigh beans (Small Metals has a scale) |
| + | * Hook up water hose and turn on |
| + | * Plug in |
| + | * Turn Power on |
| + | * Turn Heat on |
| + | * Check (and, if necessary, empty) chaff collector |
| + | * Set air and bean temperatures |
| + | * Put hopper in place over the blower vents |
| + | * Pour in beans |
| + | * Make certain the top cap is in place |
| + | * Hit Run |
| + | * Hot air heats up beans, eventually beans reach set Bean temperature |
| + | * Machine turns off heat, cooling water starts, machine continues to blow air to cool down beans |
| + | * Wait for bean temp to drop below 370 F, at which point yellow Reset lamp lights |
| + | * The operator can dump the beans now, or continue to cool the beans in the chamber. To dump: |
| + | ** Hit the Stop button. |
| + | ** Pull thr handle to dispense beans into hopper. |
| + | ** Let the air vents under the hopper cool the beans. |
| + | * Bag the beans |
| + | * Turn off Heat and Power switches |
| + | * Disconnect power |
| + | * Turn off water and disconnect hose |
| + | * Put hose back nearly |
| + | * Put machine back |
| + | * Return hopper, funnel, and supplies to Kitchen |
| | | |
| == Safety == | | == Safety == |
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| The roaster uses a Watlow PID controller (on the left) to control air temperature. It outputs a process value (4-20 mA), which an Avatar Instruments power controller uses to change the power to the heater via SCR phase dimming. The Avatar supports 240 V but the heater itself only can handle 208 V. This machine was designed to operate on 208 V but JavaMaster confirms it can operate on 240 V with an adjustment. Originally, JavaMaster suggested we limit the PID to 70% max output power. But that resulted in unexplained oscillations in temperature typically +/- 30 F. The Avatar includes an optional feature to limit output voltage via the V-LIM trim pot. This was adjusted so 100% on the PID corresponds to 208 V as measured by a true RMS voltmeter. If the machine is ever operated at 208 V again, it will require re-adjustment of this trim pot. | | The roaster uses a Watlow PID controller (on the left) to control air temperature. It outputs a process value (4-20 mA), which an Avatar Instruments power controller uses to change the power to the heater via SCR phase dimming. The Avatar supports 240 V but the heater itself only can handle 208 V. This machine was designed to operate on 208 V but JavaMaster confirms it can operate on 240 V with an adjustment. Originally, JavaMaster suggested we limit the PID to 70% max output power. But that resulted in unexplained oscillations in temperature typically +/- 30 F. The Avatar includes an optional feature to limit output voltage via the V-LIM trim pot. This was adjusted so 100% on the PID corresponds to 208 V as measured by a true RMS voltmeter. If the machine is ever operated at 208 V again, it will require re-adjustment of this trim pot. |
− |
| |
− | == Operation Checklist ==
| |
− |
| |
− | * Get stuff ready:
| |
− | ** Get hopper, funnel, bags from Kitchen
| |
− | ** Weigh beans (Small Metals has a scale)
| |
− | * Hook up water hose and turn on
| |
− | * Plug in
| |
− | * Turn Power on
| |
− | * Turn Heat on
| |
− | * Check (and, if necessary, empty) chaff collector
| |
− | * Set air and bean temperatures
| |
− | * Put hopper in place over the blower vents
| |
− | * Pour in beans
| |
− | * Make certain the top cap is in place
| |
− | * Hit Run
| |
− | * Hot air heats up beans, eventually beans reach set Bean temperature
| |
− | * Machine turns off heat, cooling water starts, machine continues to blow air to cool down beans
| |
− | * Wait for bean temp to drop below 370 F, at which point yellow Reset lamp lights
| |
− | * The operator can dump the beans now, or continue to cool the beans in the chamber. To dump:
| |
− | ** Hit the Stop button.
| |
− | ** Pull thr handle to dispense beans into hopper.
| |
− | ** Let the air vents under the hopper cool the beans.
| |
− | * Bag the beans
| |
− | * Turn off Heat and Power switches
| |
− | * Disconnect power
| |
− | * Turn off water and disconnect hose
| |
− | * Put hose back nearly
| |
− | * Put machine back
| |
− | * Return hopper, funnel, and supplies to Kitchen
| |