PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 62
to initiate pressure control to the target pressure and return to the Main Run Screen. The
Main Run Screen when pressure control is active is:
1.
Standard Main Run Screen first line showing measured
pressure and active Q-RPT. Shows target pressure value
when condition is
Ready
.
2.
Current control mode indicator. Flashes when automated
pressure control is active. Character is
<D>
for dynamic
control,
<S>
for static control.
<C>
is appended if custom
control parameters are in use.
3.
Current deviation from the target pressure (
<D>
) when in
dynamic control mode and condition is
Ready
. Target
pressure value (
<T>
) when controlling and condition is
Not
Ready
. Pressure rate of change
<R>
when in static control
mode and waiting for stability.
500.000 kPa a IH
D 0.002 D
Observe the
Ready/Not Ready
indicator LED (see Section 3.2.3) for indication of when the
controlled pressure has reached the target and stabilized. PPC4 continues controlling
following static or dynamic control operation protocol (see Section 3.2.2) until automated
pressure control is interrupted.
4.2.1.1 Interrupting Automated Pressure Control
Automated pressure control is interrupted by:
•
: Suspends control and remains in Main Run Screen. Does not vent
pressure. PPC4 passively measures the pressure applied to its
TEST(+)
port.
•
Pressing any direct pressure control key other than the jog keys (see
Section 3.2.20):
Suspends control and executes direct pressure control.
•
Pressing any function key:
Suspends control and goes to the selected
function. Does not vent pressure. PPC4 passively measures the pressure.
•
: Suspends control and goes to ENTER target pressure value screen.
Does not vent pressure. PPC4 passively measures the pressure applied to its
TEST(+)
port.
To resume automated pressure control,
and ENTER a target pressure value.
4.2.1.2 Automated Pressure Commands for Zero
Pressure
Zero in
gauge
mode:
A command for automated pressure control to a target value of zero when in
gauge or negative gauge
measurement mode is interpreted in the same
manner as if
had been pressed (see Section 3.2.14). A
Ready
condition
occurs when the vent sequence has completed, including running AutoZ if
applicable (see Section 3.2.22).
Zero in
absolute
mode:
In response to a command for automatic pressure control to a target value of
zero when in
absolute
measurement mode, PPC4 opens its down control valves
fully to the
EXHAUST
port allowing the vacuum source connected to the
EXHAUST
port to pull down the pressure as far as possible (see Figure 31).
The down valves stay open until another pressure command is given or control is
aborted.
Note
The ultimate pressure achieved by the PPC4 and the
system connected to the PPC4 TEST(+) depends on the
vacuum pump, the pump connections, the volume
connected to the TEST(+) port and PPC4 internal
restrictions.
A
Ready
condition occurs when the pressure control stability limit is reached (see
Section 3.2.3).
Summary of Contents for PPC4
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Page 194: ...PPC4 OPERATION AND MAINTENANCE MANUAL 2009 DH Instruments a Fluke Company Page 182 Notes...
Page 226: ...PPC4 OPERATION AND MAINTENANCE MANUAL 2009 DH Instruments a Fluke Company Page 214 Notes...
