Java Master 2002 Coffee Roaster: Difference between revisions
From Pumping Station One
Updated area and LTA status. |
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{{Template:EquipmentPage | {{Template:EquipmentPage | ||
|owner = Theo Tetzlaff | |owner = Theo Tetzlaff | ||
|hostarea = | |Loaned Tool Agreement = yes | ||
|hostarea = Hot Metals | |||
|certification = yes | |certification = yes | ||
|hackable = no | |hackable = no | ||
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== Description == | == Description == | ||
This is a Java Master 2002 fluid bed coffee roaster, capable of roasting up to 3.5 lbs green beans per batch. | This is a Java Master 2002 fluid bed coffee roaster, capable of roasting up to 3.5 lbs green beans per batch. | ||
=== Loaned Tool === | |||
This is an official loaned tool with an active agreement on file accepted by a board member May 8th 2023. | |||
== Roast Profile == | == Roast Profile == | ||
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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. | ||
[[Category:Loaned Equipment]] | |||
