DH Instruments PPC4, Operation And Maintenance Manual

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8. TROUBLESHOOTING
Page 207 © 2009 DH Instruments, a Fluke Company
8. Troubleshooting
PPC4 is a sophisticated pressure setting and measuring instrument with advanced on-board features
and functions. Before assuming that unexpected behavior is caused by a system defect or breakdown,
the operator should use this manual and other training facilities to become thoroughly familiar with PPC4
operation. This troubleshooting guide is intended as an aid in identifying the reason for PPC4 behavior
and determining whether the behavior is due to normal operation or an internal or external problem.
Identify the symptom or unexpected behavior you are observing from the SYMPTOM list below.
A PROBABLE CAUSE is provided and a SOLUTION is proposed including references to manual sections
that provide information that may be of assistance.
Table 32. Troubleshooting Guide
SYMPTOM PROBABLE CAUSE SOLUTION
Will not power up. Blown fuse. Replace fuse.
Cannot access certain functions
>ACCESS RESTRICTED<
Security level has been set that restricts
access to certain functions. Change user level or consult system
manager. 3.2.26.5
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

is
used. Report to your DHI Authorized
Service Provider. Table 36
There is a leak through the PPC4
EXHAUST port.
Normal flow through bypass of internal
pressure controllers when pressure supply is
connected and system is not vented or OFF.
Operation is normal if flow rate is normal. If
there is flow through the
EXHAUST port
when system is vented or OFF and
controller is not a PPC4-10M, contact
DHI
Authorized Service Representative.
7.8, 3.2.26.5
Front panel keys seem to be
disabled. <remote> command has been sent from a
host computer.
Send <local> command from host
computer or cycle PPC4 power. 6, 6.5.4
External RPM4 is not being
identified when PPC4 is powered
up or when an RPT search takes
place. PPC4 is unable to find
external RPM4 and Q-RPT.
The RPM4 COM1 port settings are not
correct. Set RPM4 COM1 port to settings
required for use with PPC4. 2.3.6, 3.2.5
Valve driver #8 seems to be
operating erratically without being
told to do so. Driver #8 is used automatically by the
automated purge function when purge is
activated. Deactivate purge function or don’t use
driver #8 other than to support an SPLT.
3.2.17
Measured pressure display has
too much/not enough resolution.
Resolution setting needs to be changed.
Use RES function to change the
resolution setting. 3.2.19
Can’t increase resolution to level
desired in AutoRanged range.
Resolution setting is limited when
AutoRanging under 10 % of Q-RPT default
range.
Operation in normal. Table 5
Values that should be non-zero
are displayed as zero. Resolution setting needs to be increased to
view significant digits. Use Resolution function to change the
resolution setting. 3.2.19
The pressure units available
under the
<Unit> menu are not
the ones desired (Basic Interface)
UNIT menu needs to be customized.
Use PresU function to customize the
UNIT function or reset units to default.
4.5.6
Front panel display is dim (Basic
Interface).
Screen saver option has activated.
Operation is normal. Press any key to
resume full screen power. Adjust screen
saver time, if desired. 3.2.26.1
Front panel is blank with moving
pressure or logo (Advanced
Interface)
Screen saver option has activated.
Operation is normal. Press any key to
resume full screen power. Adjust screen
saver time, if desired. 3.2.26.1