Application - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.11.5
4.11.6
4.11.7
Table 945: MAPGAPC Group settings (Basic)
Parameter
Start value
Start value Add
Operate delay time
1008

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.
Signals
Table 943: MAPGAPC Input signals
Name
AI_VALUE
BLOCK
ENA_ADD
Table 944: MAPGAPC Output signals
Name
OPERATE
START
Settings
Values (Range) Unit
-10000.0...10000.0
-100.0...100.0
0...200000 ms
Type Default Description
FLOAT32 0.0 Analogue input value
BOOLEAN 0=False Block signal for activating the blocking mode
BOOLEAN 0=False Enable start added
Type Description
BOOLEAN Operate
BOOLEAN Start
Step Default
0.1 0.0
0.1 0.0
100 0
1MRS759142 C
Description
Start value
Start value Add
Operate delay time
Technical Manual
REX640