ABB Relion 620 Series - Application; Signals; Settings

Blocking logic
There are three operation modes in the blocking function. The operation modes
are controlled by the BLOCK input and the global setting in Configuration >
System > Blocking mode which selects the blocking mode. The BLOCK input can be
controlled by a binary input, a horizontal communication input or an internal signal
of the protection relay's program. The influence of the BLOCK signal activation is
preselected with the global setting Blocking mode .
The Blocking mode setting has three blocking methods. In the "Freeze timers"
mode, the operation timer is frozen to the prevailing value, but the OPERATE output
is not deactivated when blocking is activated. In the "Block all" mode, the whole
function is blocked and the timers are reset. In the "Block OPERATE output" mode,
the function operates normally but the OPERATE output is not activated.
4.11.5 Application
The function block can be used for any general analog signal protection, either
underprotection or overprotection. The setting range is wide, allowing various
protection schemes for the function. Thus, the absolute hysteresis can be set to
a value that suits the application.
The temperature protection using the RTD sensors can be done using the function
block. The measured temperature can be fed from the RTD sensor to the function
input that detects too high temperatures in the motor bearings or windings, for
example. When the ENA_ADD input is enabled, the threshold value of the internal
comparator is the sum of the Start value Add and Start value settings. This allows a
temporal increase or decrease of the level detector depending on the sign and value
of the Start value Add setting, for example, when the emergency start is activated.
If, for example, Start value is 100, Start value Add is 20 and the ENA_ADD input is
active, the input signal needs to rise above 120 before MAPGAPC operates.
4.11.6 Signals
Table 731: MAPGAPC Input signals
Name Type Default Description
AI_VALUE FLOAT32 0.0 Analogue input value
BLOCK BOOLEAN 0=False Block signal for activating the
blocking mode
ENA_ADD BOOLEAN 0=False Enable start added
Table 732: MAPGAPC Output signals
Name
Type Description
OPERATE BOOLEAN Operate
START BOOLEAN Start
1MRS757644 H Protection functions
620 series
Technical Manual
771