DH Instruments PPC4, Operation And Maintenance Manual

Page: 211 / 228

7. MAINTENANCE, ADJUSTMENTS AND CALIBRATION
Page 199 © 2009 DH Instruments, a Fluke Company
7.5.2 Advanced Interface Operation

Caution
Poor control is usually caused by invalid control parameters, excessive
leaks and restrictions in the test system or other set up problems. These
problems should be identified and eliminated before resorting to use of the
configuration function (see Section 8).
To access Control Configuration use [Tools], <System>, Control Configuration .
Set Default causes PPC4 to load factory default control coefficients. This feature can be
useful to return to standard conditions if a faulty Configuration routine has been activated or
the current configuration is no longer valid.
Before running a Configuration, remove any external volume and plug the TEST(+) port.
However, if there is a minimum anticipated test volume, for example, the G15K or BG15K DVU
(see Section 2.3.7.2), leave the volume connected. Connect the normal supply pressure to
the rear panel SUPPLY port and perform a leak check.
To perform a Vacuum Configuration, connect a vacuum pump to the EXHAUST port. If the
Control Reference (see Section 3.2.27.2) is not
Vacuum an error will be displayed.
To perform an Ambient Configuration, make sure there is no vacuum applied to the
EXHAUST port. If the Control Reference (see Section 3.2.27.2) is not
Atmosphere an error
will be displayed.
This display warns the user that pressure will increase to roughly 50% of the Hi Q-RPT default
range.
[Yes] to continue if it is safe for PPC4 to set the indicated pressure.
<Running Vacuum configuration> or <Running ATM configuration> flashes above a
progress bar while the PPC4 pulses and slews pressure. After about ten minutes, the user is
asked whether or not to save the new configuration.
[Yes] if the CONFIG function ran
completely and without incident. [No] to return to the Main Run Screen with no change to the
pressure control coefficients.
If the PPC4 has a Hi Q-RPT less than or equal to A350K, repeat the configuration routine in
the other operating mode. If you never use the PPC4 in one of the two conditions, it is not
necessary to configure it in that condition.

Caution
•
The configuration routine must be run with NO external volume
connected to the PPC4 (TEST(+) port plugged) unless a known
minimum test volume is always connected. After configuring with a
volume connected to the TEST(+) port, controlling pressure with a
lower volume may result in poor pressure control.
•
The effect of the CONFIG function can be eliminated and control
coefficients returned to factory defaults by using
[Tools], <Control
Configuration>, Set Default .
7.6 Reloading Embedded Software into Flash Memory
PPC4 uses FLASH memory. This allows the embedded software that controls PPC4 operations and functions
to be loaded into PPC4 over its COM1 port from a computer with a simple FLASH loading utility program.
To replace corrupted software or upgrade your software, access the DHI worldwide web site at
www.dhinstruments.com and go to embedded located under software . A Flash loading utility and the
latest PPC4 software are available for download at no charge. If you do not have access to the web or
have difficulty downloading or loading software, contact your
DHI representative or a DHI Authorized
Service Provider for assistance.