Omron ZN-CTX21 - Zero-Out Low Current Value (LOCUT); Measurement Range (RANGE)

4. Setting the Unit (Unit Operation)
4-19
Note
The rated primary side current value cannot be specified when ETC is set to "OFF" and
DTAIL is also set to "OFF".
(29) Zero-out Low Current Value (LOCUT)
Determines low current values to be zeroed out by specifying the threshold value in a
percentage to the dedicated CT type (CT) current value. The current values equal to or lower
than the specified value are deemed noise and therefore ignored. For example, if 0.6% (initial
value) is specified and the CT value is 100A, the values equal to or lower than 0.6A (i.e. 0.6%
of 100A) are all eliminated as noise.
The range of selection (Numeric input):
0.1 to 19.9%
Initial value: 0.6%
Note
The LOCUT setting is not possible when ETC is set to "OFF" and DTAIL is also set to
"OFF".
(30) Measurement Range (RANGE)
Specifies the measurement range.
The range of selection (Options):
NORM / AUTO
Initial value: AUTO
Setting Value
Operation
NORM
The measurement range is fixed.
AUTO
The measurement range is automatically switched with
approximately 5% or less of the CT rated current.
Note
The table below shows the resolutions (reference values) under AUTO setting.
* The reference value indicates a typical value, not a guaranteed value.
CT rating
Approx. more
than 5%
Approx. 5% or
less
5A
0.1A
0.007A
50A
1.0A
0.063A
100A
2.0A
0.125A
200A
4.0A
0.250A
The measurement range cannot be specified when ETC is OFF and DTAIL is OFF.