ABB RELION REX640 Technical Manual page 176
Protection and control
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Also See for RELION REX640:
- Technical manual (1760 pages) ,
- Operation manual (164 pages) ,
- Engineering manual (156 pages)
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Basic functions
Value maximum
"Dimensionless"
Value minimum
Figure 71: Output as a ratio of the resistance range
The output scaling function:
k =
f
= − ⋅
_
AI VAL
3.15.4.2
Limit value supervision
All the measurement inputs have individual limit supervision modules that operate
similarly as in the measurement functions. The measured values are compared
against their set value limits. The limit supervision outputs are HIGH_ALARM,
HIGH_WARN, LOW_WARN and LOW_ALARM.
When an output is scaled,
to which the output value is limited or scaled. Hysteresis is added to the range limit
values so that the output value is allowed to slightly exceed or go below the limit
value before being treated as out of range.
The pre-defined hysteresis values are set based on the set
Table 105: Pre-defined hysteresis values based on Value unit
Value unit
Dimensionless
Ampere
Table continues on the next page
176
AI_VAL
100
Value unit
0
100Ω
Input minimum
Input maximum Input minimum
−
Value maximum Value minimum
−
k
Value minimum Input minimum
+
Input
f
−
=
k
Input mode
"Resistance"
Value maximum and Value minimum are the range limits
Hysteresis
Based on the scaling function
0.1 mA
1MRS759142 F
Input
1600Ω
Input maximum
(Equation 4)
(Equation 5)
(Equation 6)
Value unit .
1
REX640
Technical Manual
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