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From Pumping Station One
Java Master 2002 Coffee Roaster (view source)
Revision as of 15:43, 13 December 2022
, 15:43, 13 December 2022no edit summary
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 ==
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.
