Design - ABB REL650 Technical Manual

Section 14
Monitoring
14.10.3.1
632

Design

Figure 319 illustrates the general logic diagram of the function.
BLOCK
INPUT
RESET
CountType
OnMaxValue
MaxValue
CounterLimit1...4
InitialValue
IEC12000625 V1 EN-US
Figure 319: Logic diagram
The counter can be initialized to count from a settable non-zero value after reset of
the function. The function has also a maximum counted value check. The three
possibilities after reaching the maximum counted value are:
• Stops counting and activates a steady overflow indication for the next count
• Rolls over to zero and activates a steady overflow indication for the next count
• Rolls over to zero and activates a pulsed overflow indication for the next count
The pulsed overflow output lasts up to the first count after rolling over to zero, as
illustrated in figure 320.
Overflow indication
Actual value
... Max value -1
Counted value
... Max value -1
IEC12000626 V1 EN-US
Figure 320: Overflow indication when OnMaxValue is set to rollover pulsed
The Error output is activated as an indicator of setting the counter limits and/or
initial value setting(s) greater than the maximum value. The counter stops counting
Operation
Counter
® ®
Max value Max value +1
® ®
Max value
1MRK 506 382-UEN A
GUID-B643C994-D0BA-4BE9-BACB-ADEA0197CAE4 v1
Overflow
OVERFLOW
Detection
LIMIT1 ... 4
Limit
Check
Error
Detection
IEC12000625_1_en.vsd
®
®
Max value +2
® ®
0 1
IEC12000626_1_en.vsd
Line distance protection REL650 2.2 IEC
Technical manual
VALUE
ERROR
Max value +3 ...
...
2