DH Instruments PPC4, Руководство по эксплуатации и обслуживанию

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PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company Page 198
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The default AutoRange of the PPC4 Hi Q-RPT must be active for a
Configuration to run. (See Section 5.7.1).
7.5.1 Basic 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 the CONFIG function use <Spec>, <Internal> , <Config> in the Main Menu.
<Defaults> 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the current configuration is no longer valid.
<Run> causes the pressure control module configuration routine to execute. Before running
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.
If the PPC4 Hi Q-RPT or utility sensor is greater than
A350K, proceed directly to the
<CAUTION:> screen
below. If not, the display is:
Config type:
♦V
ac
♦Atm
Select <Vac> or <Atm> depending on whether the EXHAUST port is at vacuum or
atmosphere. If the ControlRef setting (see Section 3.2.27.2) does not correspond to your
choice, you will receive an error.
The next display is:
CAUTION: About to
set nn MPa g
This display warns the user that pressure will increase to roughly 50 % of the Hi Q-RPT
default range.

to continue if it is safe for PPC4 to set the indicated pressure.
<CFG> flashes in the lower right corner of the display. PPC4 pulses and slews pressure.
After about ten minutes, the user is asked whether or not to save the new configuration. If
the CONFIG function ran completely and without incident, use
<Yes> . <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 ( <Vac> or <Atm> ). 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.
Note
The effect of the Configuration function can be eliminated and control
coefficients returned to factory defaults by selecting <Spec>, <Internal>,
<Config>, <Defaults>.