7. Faults
22
WIKA Operating Instruction, model CPP7000-X
EN
1
1
2
8
1
2
5
1
.0
2
0
9
/2
0
1
8
EN/DE
Faults
Causes
Measures
Unable to build up further
pressure at highpressure
generation with the spindle
pump
The high-pressure shut-off
valve is opened
Close high-pressure shut-off valve
correctly
Information:
In case of an opened, or
not properly closed
high-pressure shut-off
valve, the safety
overflow valve is not
activated until
approximately 100 bar
are reached, and the oil
will flow back into the
tank. Therefore, no
pressure > 100 bar can
be built up
.
Unable to build up pressure, or
range cannot be reached
■
Air is in the system
■
The connected device
under test has a very big
volume
■
After the clamping of the test
specimen and the reference
instrument, air may be trapped
in the system.
■
The system has to be vented
before beginning with
calibration. For this purpose,
proceed according to section
6.1.3.
■
Afterwards, build the pressure
back up.
Slow lowering of the pressure
■
Leak in the system, see
fault 2.
■
Small amounts of air are
compressed in the system
together with medium.
■
After the clamping of the
test specimen and the
reference instrument, air
may be trapped in the
system, see fault 4.
■
The test pressure that has been
generated first drops off slightly.
After this it must be readjusted.
Please wait a short time, till the
pressure gets stable.
■
If the system is pressurized
quickly, it takes a certain time
(< 1 minute) until it can stabilize
thermally. The pressure should
then be adjusted accordingly.
■
Afterwards, build the pressure
back up.