ABB RET650 Technical Manual page 435

1MRK 504 135-UEN A
Technical manual
Y
High-high limit
High limit
X_RANGE=0
Low limit
X_RANGE=2
Low-low limit
X_RANGE=4
IEC05000657 V1 EN
Figure 191: Presentation of operating limits
Each analogue 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 191.
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.
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 (Cyclic)
• Amplitude dead-band supervision (Dead band)
• Integral dead-band supervision (Int deadband)
Cyclic reporting
The cyclic reporting of measured value is performed according to chosen setting
(XRepTyp). The measuring channel reports the value independent of amplitude or
integral dead-band reporting.
In addition to the normal cyclic reporting the IED also report spontaneously when
measured value passes any of the defined threshold limits.
X_RANGE = 3
X_RANGE= 1
Hysteresis
X_RANGE=0
Section 14
Monitoring
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