Pfeiffer TC 110 PB, Operating Instructions Manual

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The Pfeiffer Vacuum parameter set
29
Delayed intermittent operation
Fluctuations during intermittent operation can result in the specified switching thresholds
being exceeded or not reached, and may cause the backing pump to switch when not
required. Depending on the process or application requirements, intermittent operation
can be activated with a delay. The switching delay is dependent on the specified switch-
ing thresholds being exceeded or not met on an uninterrupted basis over a period of
time.
● Switch-off threshold, parameter
[P:710]
● Switch-on threshold, parameter
[P:711]
● Delay 8 s.
The signal can also be used for switching a fore-vacuum safety valve.
7.4.11 Operation with accessories
Depending on the configuration, various accessories can be connected to the turbopump
and controlled via parameter of the electronic drive unit.
Heating
 Switch on or off the heating via parameter
[P:001]
.
The activation of a connected casing heating depends on rotation speed switchpoint 1
(factory setting: 80 % x f
Nominal
).
Fan
Two options in the connection configuration enable continuous or temperature controlled
operation of a connected air cooling unit
(see p. 22, chap. 7.3)
. Threshold values are
type-specific and are anchored in the electronic drive unit.
Sealing gas valve
 Switch on or off a sealing gas valve which is connected to a pre-configured output via
parameter
[P:050]
.
7.4.12 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.
 Select the venting mode via parameter
[P:030]
.
Delayed venting
Start and venting time after "pumping station off" are configurable and depend on the ro-
tation speed of the turbopump.
 Parameter
[P:030]
= 0
 Adjust the venting rotation speed in % of the nominal rotation speed via parameter
[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