Example: Current monitoring in the neutral line
If the current in the neutral line is greater than 100 A
for 60 seconds, the digital output 1 should trip for at least
2 minutes.
The following must be programmed:
1. Comparator group 1
Select comparator group 1 for the limit value monitoring. The
comparator group acts only on digital output 1.
Since only one limit value is monitored, select comparator A
and program it as follows:
The address of the measured value to be monitored by
comparator A:
Address 110 = 866 (address of the current in the
neutral line)
The measured values for the B and C comparators are set
to 0.
Address 116 = 0 (the comparator is inactive)
Address 122 = 0 (the comparator is inactive)
The limit value to be observed.
Address 108 = 100 (100 A)
For a minimum exposure time of 2 minutes, digital output 1
should remain switched if the limit value is exceeded.
Address 111 = 120 seconds
For the lead time of 60 seconds, any exceeding should be
minimised.
Address 112 = 60 seconds
The operator for comparison between the measured value
and the limit value.
Address 113 = 0 (corresponds >=)
2. Source selection
Select comparator group 1 as the source.
Address 200 = 0 (comparator group 1)
3. Inverter
The result from comparator group 1 can also be inverted
here. The result is not inverted.
Address 201 = 0 (not inverted)
4. Linking comparators
The B and C comparators have not been set and are equal
to zero.
The result of comparator A is issued as a comparator result
through the OR link of comparators A, B and C.
Address 107 = 0 (OR link)
Result
Digital output 1 is tripped for at least 2 minutes if the current in
the neutral line is greater than 100 A for more than 60 seconds.
Digital output 1 is conductive. Current can flow.
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