Appendix D - Setting Temperature Gains U81923; Only - Graco PR70 Operation & Maintenance Manual

Appendix D - Setting Temperature Gains U81923 Only
NOTICE
Adjusting the temperature gains should only be per-
formed by a technician knowledgeable in the opera-
tion of this machine. Incorrect adjustment of the
temperature gains can lead to overheating, erratic
temperature control, and/or poor chemical reaction
due to poor temperature control.
Gains control two things: temperature fluctuation from
the set point and heating time at startup. If the tempera-
ture gains have been changed and temperature control
is not performing as desired, reset all gains to "100". If
the temperatures are not controlled to the desired per-
formance with the default settings at "100", adjust the
gains for the specific application. Things to consider
when adjusting the gains:
• It is recommended all gains are set to the same
number.
• Higher gains will lead to faster heating at initial
startup but will increase temperature fluctuation.
• Lower gains will lead to smaller temperature mar-
gins and slower heating at initial startup.
• Lower material flow rates require higher gains to
keep the materials from overheating.
• Higher flow rates may accept lower gains without
overheating.
1. Insert memory stick into the USB port on the front
panel.
2. Dispense a shot. At the end of the shot the data log
will record the following data in a CSV file:
• Date
• Time
• Average Pressure
• Average Dispense Temperature
• Shot Size Set Point
• Flow Rate Set Point
• Ratio Set Point
• A Tank Temperature
• A Pump Temperature
• A Tank Temperature
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Appendix D - Setting Temperature Gains U81923 Only
3. To start a new file on a new memory stick, copy the
folder "FILES" with the file "template.csv" from the
original memory stick to the new one. This is where
the header information is stored. Insert the new
memory stick in and after the first shot a new
test.csv file will be created.
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