20
The Pfeiffer Vacuum parameter set
Fig. 4:
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 initial-
ly 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 pow-
er and gas friction is attained.
To avoid rotation speed fluctuations, Pfeiffer Vacuum recommends setting a
somewhat 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 pro-
longs. To avoid error messages, the parameter
[P:700] RUTimeSVal
should be ad-
justed accordingly.
Run-up time
The run-up of the turbopump is time-monitored ex factory. There are various caus-
es 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 rota-
tion speed switch-
point
The rotation speed switch point can be used for the message "Pump operational
for the process". Overrunning or underrunning the active rotation speed switch
point activates or deactivates a signal at the pre-configured output on the electron-
ic 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 switch point 1
[P:701]
.
[P:708]
D
F
B
A
C
E
Pm
a
x
f
N
Run-up
Rot
a
t
i
on speed
P
ower
C-D = g
a
s mode "0"
A-B = g
a
s mode "1"
E-F = g
a
s mode "2"
