Setting Example - ABB REB670 Applications Manual

Section 13
Logic
13.13.4
398
EnaAbs: This setting is used to select the comparison type between signed and absolute
values.
• Absolute: The function will do absolute comparison between input and reference
value.
• Signed: The function will do signed comparison between input and reference value.
RefSource: This setting is used to select the reference source between input and setting for
comparison.
• REF: The function will take reference value from input REF
• SetValue: The function will take reference value from setting SetValue
SetValue: This setting is used to set the reference value for comparison when setting
RefSource is selected as SetValue. If this setting value is less than 0.2% of the set unit then
the output INLOW will never pickups.
RefPrefix: This setting is used to set the unit of the reference value for comparison when
setting RefSource is selected as SetValue. It has 5 unit selections and they are Milli, Unity,
Kilo, Mega and Giga.
EqualBandHigh: This setting is used to set the equal condition high band limit in % of
reference value. This high band limit will act as reset limit for INHIGH output when
INHIGH is high in last execution.
EqualBandLow: This setting is used to set the equal condition low band limit in % of
reference value. This low band limit will act as reset limit for INLOW output when
INLOW is high in last execution.

Setting example

Let us consider a comparison is to be done between current magnitudes in the range of 90
to 110 with nominal rating is 100 and the order is kA.
For the above condition the comparator can be designed with settings as follows,
EnaAbs = Absolute
RefSource = SetValue
SetValue = 100
RefPrefix = Kilo
EqualBandHigh = 5.0 % of reference value
1MRK 505 337-UUS -
Application manual