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VDL (E3.1) 10/2020 Page 170/196
Fault description
Possible cause
Required measures
Controller (continued)
Measured-value memory
cleared in Chart recorder func-
tion, information lost.
New setting of storage rate or
scaling (minimum and/or maxi-
mum) (chap. 22.2).
Change the storage rate or scaling
ONLY if the previously registered
data are no longer required.
Program does not run correctly
after starting it.
Pressure threshold of 100 mbar
not reached. No heater release
Wait until pressure threshold is
reached and heater released. Start
program after this or set suitable toler-
ance limits.
If appropriate, select suitable pres-
sure setpoint.
Controller does not equilibrate
to program set-points.
Controller is not in program op-
eration mode, or program delay
time is running.
Start the program again. If appropri-
ate, wait for the program delay time.
Program duration longer than
programmed.
Tolerances have been pro-
grammed.
For rapid transition phases, do NOT
program tolerance limits in order to
permit maximum heating, evacuating,
or ventilation speed.
Program keeps the last pro-
gram setpoint constant while in
setting “ramp”.
Program line with setting “ramp”
is incomplete.
When programming with setting
“ramp”, define the end value of the
desired cycle by adding an additional
section with a section time of at least
one second.
Ramp temperature transitions
are only realized as steps.
Setting “step” has been se-
lected.
Select setting “ramp”.
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