PPC4™ OPERATION AND MAINTENANCE MANUAL
© 2009 DH Instruments, a Fluke Company
Page 208
SYMPTOM
PROBABLE CAUSE
SOLUTION
AutoRange is not selecting the
desired Q-RPT for the specified
range.
The external (RPM4) Q-RPT is not
initialized.
Check that the external RPM4 is connected
and initialized properly. 2.3.6, 3.2.5
The Q-RPT range does not cover the
desired AutoRange.
Check that Q-RPT default range is high
enough to cover the AutoRange. Table 1
The Q-RPT is Gxxx (gauge only).
Check that the Q-RPT type supports the
desired measurement mode. 1.2.2.1,
3.2.11
The specified operating mode is absolute or
negative gauge and absolute mode and
negative are OFF for the desired Q-RPT
Check that absolute/negative gauge is ON
for the Q-RPT. 3.2.4, 7.2.5
There is a
<C>
to the right of the
<D>
or
<S>
control mode
character on the bottom line of
the display and it won’t go away.
The custom control function has been used.
Reset control parameters to default.
3.2.13
Pressure display is flashing and
beeper is sounding intermittently.
Current upper or lower limit of active range
has been exceeded.
Correct overpressure condition.
Change UL and/or active range if
needed. 3.2.21, 3.2.21.1
Pressure display is flashing, no
beeper is sounding and direct
pressure control keys are inactive.
PPC4 and/or external RPM4 have been
over-pressured.
Correct the overpressure condition and
cycle power ON and OFF. 3.2.21.1
Display is <Check Xaa aaa RPT,
wdog: nnnnn uuuum> and
pressure control is aborted.
PPC4 internal watchdog measurement
system has detected that active external Q-
RPT does not appear to be connected as its
pressure is not changing as expected when
PPC4 controls the pressure.
Check that external RPM4 Q-RPT is
connected properly to PPC4
TEST(+)
port.
Cycle PPC4 power. 2.3.6
A
Ready
(green
Ready/Not Ready
indicator) indication is never
achieved.
Control parameter settings are too tight
and/or existing conditions will not allow
Ready
to be achieved.
Adjust control parameters or correct other
conditions. 3.2.3, 3.2.12
Q-RPT is Gxxx (gauge) but cannot
select absolute or negative gauge
measurement mode.
Q-RPT is Gxxx and does not support
absolute and gauge measurement modes or
Operation is normal. 3.2.11
Q-RPT is Axxx (absolute) but
cannot select absolute or negative
gauge measurement mode.
Absolute and negative gauge measurement
modes have been turned off in the
calibration function.
Check that absolute/negative gauge is ON.
7.2.5
Will not accept pressure command.
Target exceeds UL and/or current range.
Check UL, range and measurement mode.
3.2.21, 3.2.8, 3.2.11
Will not set pressure.
Pressure and/or vacuum supply incorrectly
connected or not adequate.
Correct pressure and/or vacuum supply.
2.3.4, 2.3.5
There is a very large leak in the test system
or
TEST(+)
port is not connected.
Correct leak. 2.3.8, 3.2.18
Will not set negative gauge
pressure.
Measurement mode is not negative gauge.
Set negative gauge mode if supported by
Q-RPT. 3.2.11
Poor pressure control at low
gauge pressure.
Vacuum source on
EXHAUST
port is needed.
Connect vacuum source to
EXHAUST
port.
2.3.5
Ambient (atmospheric pressure) is too noisy
and/or not consistent on
TEST (-)
port and UUT.
Connect
TEST (-)
ports of PPC4, RPM4s if
present and UUT together and consider
isolating from atmospheric pressure. 2.3.7,
2.3.8
Poor pressure control at low
gauge and/or absolute pressure.
ControlRef not properly set to reflect
pressure conditions at
EXHAUST
port.
Set Control Reference properly. 3.2.27.2
Poor pressure control at very low
gauge pressure.
DVU is needed, particularly if the Q-RPT is a
G15K or BG15K.
Install DVU on
TEST(+)
and
TEST (-)
ports.
2.3.7.2
Poor pressure control at pressures
under atmosphere or inability to
reach pressures under
atmosphere.
Vacuum supply is incorrectly connected, is
not low enough or is unstable.
Correct vacuum supply to
EXHAUST
port.
2.3.5
Poor pressure control characterized
by control interrupting near the
target pressure.
Control mode is set to static mode rather
than dynamic mode.
Set control mode to dynamic. 3.2.2, 3.2.12
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