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24
The Pfeiffer Vacuum parameter set
Vent modes
The turbopump can be vented only after the function "pumping station" has been
switched off. Signals are sent to configured outputs with a fixed delay of 6 s. There
are three options for operation with a venting valve connected.
Enable venting via parameter
[P:012]
.
Select the venting mode via parameter
[P:030]
.
Delayed venting
Start and venting time after "pumping station off" are configurable and depend on
the rotation speed of the turbopump.
Parameter
[P:030]
= 0
Adjust the venting rotation speed in % of the nominal rotation speed via param-
eter
[P:720]
.
Adjust the venting time in s via parameter
[P:721]
.
If the venting rotation speed is underrun, the venting valve will open for the set
venting time. In the event of a power failure, venting will occur if the set venting
rotation speed is underrun. In this case, the venting period depends on the residual
energy delivered by the moving rotor. When power is restored, the venting process
is interrupted.
No venting
No venting is performed during this operation mode.
Parameter
[P:030]
= 1
Direct venting
Start and venting time are not configurable. Venting starts with a delay of 6 s after
"pumping station off". When the function "pumping station" is switched on re-
newed, the venting valve closes automatically. In the event of a power failure, vent-
ing will occur if an anchored type-specific rotation speed is underrun. When power
is restored, the venting process is interrupted.
Parameter
[P:030]
= 2
Monitoring the ther-
mal load
If threshold values are overrun, output signals from temperature sensors allow the
pump to be brought to a safe condition. Depending on pump type, temperature
threshold values for warnings and error messages are saved fixed in the electronic
drive unit . For information purposes, various status queries are prepared in the pa-
rameter set.