ABB RELION REX640 Technical Manual page 179

1MRS759142 F
mA current is measured at channel 1. AI_VAL from measuring channel 1 is
connected to AO_VAL of output channel 2.
(mA) and
and
Value maximum 20
Value minimum
Figure 76: Scaling of AO_VAL to mA output with two knee points
Example 3: RTD input to mA output
AO_VAL
Figure 77: Application example for RTD input to mA output
Tap position is measured by the RTD channel 7. AI_VAL from channel 7 is
connected to AO_VAL of channel 1.
Input minimum to "10" (ohm). Value maximum is set to "20" mA and Value
minimum is set to "4" mA. Num of knee points is set to "4".
REX640
Technical Manual
Input minimum to "–20" (mA). Value maximum is set to "20" mA
Value minimum is set to "0" mA. Num of knee points is set to "2".
Output [mA]
Value knee
15
point 2
Value knee
5
point 1
0
-20 -15
Slot# – mA1
AI_VAL
HIGH_ALARM
HIGH_WARN
LOW_WARN
LOW_ALARM
Slot# – RTD 7
AI_VAL
HIGH_ALARM
HIGH_WARN
LOW_WARN
LOW_ALARM
SENSOR_FLT
Input maximum is set to "20"
Input maximum is set to "160" (ohm) and
Basic functions
AO_VAL
15 20
179