ABB RED650, Applications Manual

Page: 274 / 454

12.4.2 Application
SEMOD114927-4 v7
The logic rotating switch for function selection and LHMI presentation function
(SLGAPC) (or the selector switch function block, as it is also known) is used to get
a selector switch functionality similar with the one provided by a hardware multi-
position selector switch. Hardware selector switches are used extensively by
utilities, in order to have different functions operating on pre-set values. Hardware
switches are however sources for maintenance issues, lower system reliability and
extended purchase portfolio. The virtual selector switches eliminate all these
problems.
SLGAPC function block has two operating inputs (UP and DOWN), one blocking
input (BLOCK) and one operator position input (PSTO).
SLGAPC can be activated both from the local HMI and from external sources
(switches) via the IED binary inputs. It also allows the operation from remote (like
the station computer). SWPOSN is an integer value output, giving the actual output
number. Since the number of positions of the switch can be established by settings
(see below), one must be careful in coordinating the settings with the configuration
(if one sets the number of positions to x in settings – for example, there will be
only the first x outputs available from the block in the configuration). Also the
frequency of the (UP or DOWN) pulses should be lower than the setting
tPulse .
From the local HMI, the selector switch can be operated from Single-line diagram
(SLD).
12.4.3 Setting guidelines
SEMOD115063-294 v7
The following settings are available for the Logic rotating switch for function
selection and LHMI presentation (SLGAPC) function:
Operation : Sets the operation of the function On or Off .
NrPos : Sets the number of positions in the switch (max. 32).
OutType : Steady or Pulsed .
tPulse : In case of a pulsed output, it gives the length of the pulse (in seconds).
tDelay : The delay between the UP or DOWN activation signal positive front and
the output activation.
StopAtExtremes : Sets the behavior of the switch at the end positions – if set to
Disabled , when pressing UP while on first position, the switch will jump to the last
position; when pressing DOWN at the last position, the switch will jump to the first
position; when set to
Enabled , no jump will be allowed.
Section 12
1MRK 505 393-UEN B
Control
268 Line differential protection RED650 2.2 IEC
Application manual