20
The Pfeiffer Vacuum parameter set
Fig. 6:
Principle of power characteristics lines for gas type dependent operations,
e.g. gas mode = 0
The turbopump runs up with maximum power consumption. When the nominal and/or set
rotation speed is reached, the pump automatically switches over to the chosen power
characteristic of the selected gas mode. Increasing gas load is initially compensated by
a rise in power consumption in order to keep the rotation speed constant. Increasing gas
friction, however, causes the turbopump to heat up more severely. When the gastype-
dependent maximum power is exceeded, the rotation speed of the turbopump is reduced
until an equilibrium between permissible power and gas friction is attained.
To avoid rotation speed fluctuations, Pfeiffer Vacuum recommends setting a some-
what lower frequency in rotation speed setting mode.
Set value power con-
sumption
Adjust the parameter
[P:708]
to the desired value in %.
If adjusting the set value power consumption below 100 % the run-up time prolongs. To
avoid error messages, the parameter
[P:700] RUTimeSVal
should be adjusted accord-
ingly.
Run-up time
The run-up of the turbopump is time-monitored ex factory. There are various causes of
prolonged run-up times, e.g.:
●
Too high gas loads
●
Leakage in the system
●
The set value run-up time is too low
Eliminate any external and application-related causes.
Adjust the run-up time via parameter
[P:700]
.
Adjusting the rotation
speed switchpoint
The rotation speed switchpoint can be used for the message "Pump operational for the
process". Overrunning or underrunning the active rotation speed switchpoint activates or
deactivates a signal at the pre-configured output on the electronic drive unit and at the
status parameter
[P:302]
.
Rotation speed switchpoint 1
Adjust the parameter
[P:701]
to the desired value in %.
Parameter
[P:017]
= 0
Signal output and status parameter
[P:302]
are based on the set value for rotation speed
switchpoint 1
[P:701]
.
[P:708]
D
F
B
A
C
E
Pmax
fN
Run-up
Rotation speed
P
ower
C-D = gas mode "0"
A-B = gas mode "1"
E-F = gas mode "2"
