MKS 651C, Instruction Manual, Page: 84 / 172

How To Activate the Learn Function Chapter Six: Remote Operation
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How To Activate the Learn Function
The learn function enables the 651 unit to identify important system characteristics for
Self-Tuning control. Use the learn function whenever you install a new vacuum system or
change any processing conditions (such as changed flow rate, new or refurbished pump, or piping
changes). The learning process may take several minutes to complete.
Note
The system pressure will vary during the learn cycle to as low and high as
is possible for the current flow rate.
1. Initiate the proper gas flow into the system.
Gas flow rate should be close to that used for the actual process (use the maximum flow
rate if several flow rates are used in the process). Do not vary the gas flow rate during
the learn function.
2. Issue the following command to initiate the learn function:
L ENTER
The system responds by initiating the learning process. This process may take several
minutes to complete.
3. Issue a system status request message to determine the status of the learn process:
R37 ENTER
The 651 controller responds with the following message:
M XYZ
where
X
=0 for remote control
Y
indicates the system status
0 when not performing the learn process
1 when performing the learn process
2 when learning the valve
Z
0 for valve open
1 for valve close
2 valve stop
3 set point A
4 set point B
5 set point C
6 set point D
7 set point E
8 analog set point