DH Instruments PPCK PLUS, Руководство по эксплуатации и обслуживанию

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PPCK+™ Operation and Maintenance Manual
©2001 DH Instruments, Inc .
Page 132
Table 18. Troubleshooting Guide (Continued)
SYMPTOM POSSIBLE CAUSE SOLUTION
Poor pressure control
characterized by excessive
overshooting and/or
undershooting, inability to lock-on
target, unstable readings. PPCK+ is contaminated with
liquids. Purge PPCK+ from the drain.
Avoid sources of liquids in the
future. Contact Authorized
Service Center if purging does
not eliminate liquid (5.4,
Table 22).
Poor pressure control
characterized by excessive
pressure noise at control point
and/or hunting around target. Excessive leak present in
system. Correct internal or external leak
or increase hold limit. Consider
using static pressure control if
you must work with large leaks
present (3.2.8, 3.2.6, 3.1.2.3).
Poor pressure control
characterized by very slow slew
rate and/or time to
Ready
condition when setting a
pressure.
Test volume is too large. Reduce test volume if slew rate
is unacceptable.
Poor pressure control
characterized by excessively fast
slew rate and overshooting. Test volume too small. Increase test volume.
Poor pressure control
characterized by pauses at the
start of a pressure setting
sequence. Ten to fifteen seconds are
required for the high pressure
valve opening routine to execute.
During this time, pressure does
not change. The control status
characters display
<VLV>
flashing.
Operation is normal. Watch the
pressure control characters on
the main run screen. They
indicate
<VLV> during the valve
opening routine (3.1.1, 3.1.2.3).
Poor pressure control
characterized a pause of up to
45 seconds while controlling in
dynamic control mode while
<CFG> is flashing a the valve
control characters.
PPCK+ has determined that the
test volume has changed and is
running a new volume
determination routine. The
routine takes 30 to 45 seconds to
execute and should repeat only if
the test volume is changed. Operation is normal.
Apparent inaccurate pressure
control/measure and little or no
response or nonsensical
indication from reference
pressure transducer. Reference transducer destroyed
by overpressure. Contact DHI Authorized Service
Provider (Table 22).