6. TROUBLESHOOTING
Page 121 © 1998 DH Instruments, Inc.
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PPC2 AF is a sophisticated pressure setting and measuring instrument with advanced on-board features
and functions. Before assuming that unexpected behavior is caused by system defect or breakdown, the
operator should use this manual and other training facilities to become thoroughly familiar with PPC2 AF
operation. This troubleshooting guide is intended as an aid in identifying the reason for PPC2 AF behavior
and determining whether the behavior is due to normal operation or an internal or external problem.
SYMPTOM POSSIBLE CAUSE SOLUTION
Will not power up. Blown fuse. Replace fuse (5.1.2.1).
There is a leak through the EXHAUST
port.
Normal flow through bypass of internal
pressure controllers when pressure
supply is connected.
None necessary if flow rate is normal
(5.1.3).
Measured pressure display has too
much/not enough resolution.
Resolution setting needs to be
changed.
Use Res function to change resolution
setting (3.3.2).
The pressure units selectable under
the PRESSURE function key are not
the ones you want.
UNIT function needs to be
customized.
Use PresU function to customize the
PRESSURE function (3.4.1)
Front panel keys seem to be disabled.
"Remote" command has been sent
from a host computer.
Send "local" command from host
computer or cycle PPC2 AF power.
Valve driver #8 seems to be operating
erratically.
Driver #8 is used by the automated
purge function
Don't use driver #8 other than to
support an SPLT ( 3.2.8, 9.1, 9.2)
Front panel display is dim Screen saver option has activated.
Press any key to resume full screen
power.
Cannot access certain functions.
User levels have been set that restrict
access to certain functions.
Change user level or consult system
manager (3.4.4.6).
Displays "FATAL ERROR" or "FATAL
FAULT".
Encountered unresolved internal
software conflict.
Cycle power to clear. Please record
conditions leading up to event
including the numbers displayed when
enter is pressed and report to DHI
Technical Service.
There is a C next to 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 by
selecting a control mode using the
CONTROL function (3.2.3, 3.2.6)
Pressure display is flashing.
Current upper limit of active range has
been exceeded.
Correct overpressure condition.
Change UL and/or active range if
needed (3.2.4, 3.2.1).
A "ready" indication is never achieved.
Control parameter settings are too
tight and/or existing conditions will not
allow "ready".
Adjust control parameters or correct
other conditions (3.1.2.4, 3.2.6).
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