ABB REG650 Technical Manual page 418

Section 14
Monitoring
412
zero point clamping might be overridden by the zero point clamping used for the
measurement values within CVMMXN.
Continuous monitoring of the measured quantity
Users can continuously monitor the measured quantity available in each function block
by means of four defined operating thresholds, see figure 193. The monitoring has two
different modes of operating:
• Overfunction, when the measured current exceeds the High limit (XHiLim) or High-
high limit (XHiHiLim) pre-set values
• Underfunction, when the measured current decreases under the Low limit
(XLowLim) or Low-low limit (XLowLowLim) pre-set values.
X_RANGE is illustrated in figure 193.
Y
High-high limit
High limit
X_RANGE=0
Low limit
X_RANGE=2
Low-low limit
X_RANGE=4
IEC05000657 V1 EN
Figure 193: 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 193.
The user can set the hysteresis (XLimHyst), which determines the difference between
the 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.
X_RANGE = 3
X_RANGE= 1
Hysteresis
X_RANGE=0
1MRK 502 043-UUS B
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Technical Manual