30
The Pfeiffer Vacuum parameter set
9.4.8
Standby
Pfeiffer Vacuum recommends standby mode for the turbopump during process and pro-
duction stops. When standby mode is active, the electronic drive unit reduces the rotation
speed of the turbopump. Standby mode is ineffective during rotation speed setting mode.
The factory setting for the set value in standby mode is 66.7 % of the nominal rotation
speed. Underrunning or overrunning the set speed in standby mode activates or deacti-
vates the status signal
[P:306] SetSpdAtt
.
Adjust the parameter
[P:717]
to the desired value in %.
Parameter
[P:026]
= 0
Parameter
[P:002]
= 1
Read the parameters
[P:308]/[P:397]
.
9.4.9
Rotation speed set value
The typical nominal rotation speed of a turbopump is factory-set in the electronic drive
unit. If the electronic drive unit is replaced or a different pump type is used, the reference
set value of the nominal rotation speed must be confirmed. This procedure is part of a
redundant safety system for avoiding excess rotation speeds.
Adjust the parameter
[P:777]
according to the pump type.
Once the nominal rotation speed is attained, the pump will run idle unless additional gas
loads are entered. Depending on process or application requirements, the nominal rota-
tion speed can be reduced in rotation speed setting mode or standby mode.
9.4.10 Operation mode backing pump
Operation of a connected backing pump via the electronic drive unit depends on the
backing pump type.
Adjust the parameter
[P:025]
to the desired value.
Continous operation
With "pumping station on", the electronic drive unit sends a signal to the configured ac-
cessory connection to switch on the backing pump. This signal can also be used for con-
trolling a fore-vacuum safety valve.
Intermittend operation (diaphragm pumps only)
Intermittend operation can extend the life expectancy of the membrane of a connected
diaphragm pump. Either a diaphragm pump with built-in semiconductor relay or an inter-
connected relay box with semiconductor relay is required for intermittend operation. The
backing pump is switched on and off in dependence of the turbopump's power consump-
tion. A relation to the supplied fore-vacuum pressure is derived from the power consump-
tion. The switching off and switching on thresholds 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 intermittend mode.
Pfeiffer Vacuum recommends the intermittend mode between 5 and 10 hPa. 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 hPa by gas inlet via dosing valve.
HiPace
Nominal rotation speed confirmation [P:777]
1200 / 1500
630 Hz
1800 / 2300
525 Hz
Operation mode [P:025]
recommended backing pump
"0" continous operation
all kinds of backing pumps
"1" Intermittend operation
diaphragm pumps only
"2" Delayed switching on
all kinds of backing pumps
