OPG1™ Operation and Maintenance Manual
©2000
DH Instruments, Inc
.
Page
34
Table 3.
OPG1 Troubleshooting Checklist (Continued)
SYMPTOM
PROBABLE CAUSE
SOLUTION
PDVV will not increase pressure.
PDVV is at maximum end of
stroke position, PDVV supply
pressure is not high enough, or
PDVV supply plugged.
Verify PDVV piston position and
readjust if necessary. Use
INLET
valve
to increase pressure. Increase
pneumatic supply pressure. Clean
filter. (3.2.3, 4.5)
PDVV will not decrease
pressure.
PDVV is at minimum end of
stroke position.
Verify PDVV piston position and
readjust if necessary. Use
OUTLET
valve
to decrease pressure. (3.2.3)
Opening
INLET valve
does not
increase pressure.
Pump drive pressure too low.
Adjust pump drive pressure, increase
pneumatic supply pressure if
necessary. (3.2.1, 2.3.1.2, Table 2)
Pump cycles continuously
without generating pressure.
The pump has lost its prime,
oil tank empty.
Purge and prime pump. (4.4)
Pump cycles continuously
without generating pressure.
OUTLET valve
is open.
Close
OUTLET valve.
(3.2.2)
Pump cycles continuously
without generating pressure.
There is a large leak in the test
system to which OPG1 is
connected.
Identify and correct leak in test
system.
Pump cycles excessively before
beginning to generate pressure.
The test volume to which
OPG1 is connected has not
been purged of air and pump
is filling test volume and
compressing air.
Purge air from test system before
generating pressure. (3.2.5)
Oil is leaking out of an open point
in the test system.
The open point in the test
system is below the OPG1
tank and the
OUTLET valve
is
open so oil is running out from
the tank .
Operation is normal. Be sure to keep
the
OUTLET valve
closed when any
point at a lower height than the OPG1
tank is open. (2.3.1.4)
Pressure is not returning to zero
when the
OUTLET valve
is
opened.
There is air in the OPG1
and/or system under test.
Purge air from the OPG1 and/or
system under test. Disconnect the
DUT at the test port to zero the DUT.
(3.2.5)