Application - ABB REG670 Applications Manual

1MRK 502 071-UEN -
15.5.2
15.5.3
15.6
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual

Application

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).
Setting guidelines
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.
Selector mini switch VSGAPC
Section 15
Control
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