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GA 09.035/6.02 - 07/2011 - © Oerlikon Leybold Vacuum
Parameters
5
Parameters
5.1
Switching function parameters (
PArA SP
)
This parameter group allows you to configure the switching functions. The fol-
lowing switching function parameters are available in the CENTER TWO:
SP1-L
SP1-H
SP2-L
SP2-H
SP3-L
SP3-H
SP4-L
SP4-H
In addition, the CENTER THREE is equipped with the following switching func-
tion parameters:
SP5-L
SP5-H
SP6-L
SP6-H
5.1.1
Fundamental terms
Switching functions
The CENTER TWO is equipped with four relays which switch in dependance
of the measured pressure. The relay contacts are potential-free and can be
used for switching via the RELAY connection. See Chapter 3.3.5 RELAY,
21. In this context we speak of the switching functions 1…4.
The CENTER THREE contains a total of six switching function relays, i.e. the
switching functions 1…6 are available in this unit.
Threshold values
The switching behavior of the individual relays is determined by two parame-
ters each: The lower threshold value and the upper threshold value of the
switching function.
Lower threshold value
SP-L
:
The lower threshold value is responsible for activating the assigned switch-
ing function. The relay switches on as soon as the pressure falls below the
lower threshold value. This means that the common contact of the relay is
connected to the make contact.
Upper threshold value
SP-H
:
The upper threshold value is responsible for deactivating the assigned
switching function. The relay switches off as soon as the pressure rises
above the upper threshold value. This means that the common contact of
the relay is connected to the make contact.
