Pfeiffer TC400, Руководство по эксплуатации

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23
The Pfeiffer Vacuum parameter set
olds for the backing pump are adjustable. Fluctuations in the power consumption
of idling turbopumps and type-dependent varying fore-vacuum pressures of the
backing pumps require the switching thresholds to be set separately for the inter-
mittend mode.
Pfeiffer Vacuum recommends the intermittend mode between 5 and 10 mbar. A
pressure gauge and a dosing valve are required to set the switching thresholds.

Switch on the vacuum system via the function "pumping station" and await the
run-up.

Generate a fore-vacuum pressure of 10 mbar by gas inlet via dosing valve.

Read and note the parameter [P:316] .

Adjust the switch on threshold backing pump via parameter [P:711] to the deter-
mined drive power for a fore-vacuum pressure of 10 mbar.

Reduce the fore-vacuum pressure to 5 mbar.

Read and note the parameter [P:316] .

Adjust the switch off threshold backing pump via parameter [P:710] to the deter-
mined drive power for a fore-vacuum pressure of 5 mbar.
Delayed switching on
Switching on the turbopump and the backing pump at the same time can result in
unwanted gas flows. Depending on process or application requirements, the back-
ing pump can be switched on with a delay. The switch-on delay depends on the ro-
tation speed of the turbopump and is fixed in the electronic drive unit at 6 Hz.
The switch-on delay signal can also be used for switching a fore-vacuum safety
valve.
Switching on the
pumping station
The function "pumping station" comprises turbopump operation with control of all
connected accessories (e.g. backing pump).

Switch on the supply voltage with switch S1 on the power supply.

Parameter [P:023] = 1

Parameter [P:010] = 1
Ongoing (and removed) error messages are reset. After a successfully completed
self-test, the electronic drive unit sets the turbopump motor and all connected ac-
cessories into operation depending on their configuration.
When the pumping station is activated, the turbopump can be switched off and on
via the function
[P:023] .
Operation with acces-
sories
Depending on the configuration, various accessories can be connected to the tur-
bopump 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 switch
point 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. 17, 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 out-
put via parameter
[P:050] .