PPC2+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc.
Page 136
5 . 5 P N E U M A T I C C O N T R O L M O D U L E C O N F I G U R A T I O N
m
PURPOSE
To run an automated routine that allows PPC2+ to readjust automated pressure control
coefficients to take into account changes in the characteristics of its pressure control hardware
over time or to return automated pressure control coefficients to factory default values.
m
PRINCIPLE
PPC2+ uses default factory configuration coefficients in the pressure control algorithms used for
automated pressure control. Changes in the pressure control elements (valves, orifices and
pressure controllers) over time can cause pressure control performance to change as the factory
configuration values become less valid. The configuration routine automatically retunes the
factory configuration coefficients to take into account small changes in performance.
Use of the configuration function should be considered a maintenance function used only when
PPC2+ pressure control has deteriorated noticeably as evidenced by significant
changes
in the
time required to set a pressure, excessive overshoot when setting a pressure and/or hunting
around the target value in dynamic control mode.
The configuration function is only designed to compensate for the small changes in pressure
control hardware that may occur with normal wear over time. Major changes to the pressure
control hardware such as replacing a valve or pressure controller normally require a complete
factory recharacterization of the pneumatic module.
The configurations function also allows pressure control parameters to be returned to factory
default values.
m
OPERATION
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^O]^ VSXO Y\ Y^RO\ ]O^_Z Z\YLVOW] >RO]OZ\YLVOW] ]RY_VN LO SNOX^SPSON KXN OVSWSXK^ON LOPY\O
\O]Y\^SXQ^Y_]OYP^ROMYXPSQ_\K^SYXP_XM^SYX]OO-RKZ^O\
=OO^RO::-,19ZO\K^SYXKXN7KSX^OXKXMO7KX_KVPY\SXPY\WK^SYX]ZOMSPSM^Y_]SXQ^RO
MYXPSQ_\K^SYXP_XM^SYXaS^R^RO,1WYNOV
To access the Config function press [SPECIAL] and select <4Internal>, <1Config>.
The display is:
Selecting <2Defaults> will cause PPC2+ to reload the factory default control coefficients.
This feature can be useful to return to a normal condition if a faulty Config routine has
been activated.
Summary of Contents for PPC2+
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