ABB RELION 670 Series Technical Manual page 369

1MRK 502 066-UUS B
Continuous monitoring of the measured quantity
Users can continuously monitor the measured quantity available in the function block by means of
four defined operating thresholds, see figure 190. The monitoring has two different modes of
operating:
• Overfunction, when the measured current exceeds the High limit (
XHiHiLim ) pre-set values
(
• Underfunction, when the measured current decreases under the Low limit (
low limit (
X_RANGE is illustrated in figure 190.
High-high limit
High limit
Low limit
Low-low limit
IEC05000657 V2 EN-US
Figure 190: Presentation of operating limits
Each analog output has one corresponding supervision level output (X_RANGE). The output signal
is an integer in the interval 0-4 (0: Normal, 1: High limit exceeded, 3: High-high limit exceeded, 2:
below Low limit and 4: below Low-low limit). The output may be connected to a measurement
expander block (XP (RANGE_XP)) to get measurement supervision as binary signals.
The logical value of the functional output signals changes according to figure 190.
The user can set the hysteresis (
operating and reset value at each operating point, in wide range for each measuring channel
separately. The hysteresis is common for all operating values within one channel.
Actual value of the measured quantity
The actual value of the measured quantity is available locally and remotely. The measurement is
continuous for each measured quantity separately, but the reporting of the value to the higher
levels depends on the selected reporting mode. The following basic reporting modes are available:
• Cyclic reporting (
• Magnitude dead-band supervision (
• Integral dead-band supervision (
Technical manual
XLowLowLim ) pre-set values.
Y
X_RANGE = 3
X_RANGE= 1
X_RANGE=0
X_RANGE=0
X_RANGE=2
X_RANGE=4
XLimHyst ), which determines the difference between the
Cyclic )
Hysteresis
Dead band )
Int deadband )
Impedance protection
XHiLim ) or High-high limit
XLowLim ) or Low-
t
IEC05000657-2-en.vsdx
Section 7
SEMOD54417-140 v4
SEMOD54417-150 v3
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