ABB RELION REX640 Technical Manual page 1296

Section 8
Measurement functions
1290
measured values are set to the nominal and also the quality
information of the data set accordingly. The undervoltage limit is
fixed to 10 percent of the nominal for the frequency measurement.
Limit value supervision
The limit value supervision function indicates whether the measured value of
X_INST exceeds or falls below the set limits. The measured value has the
corresponding range information X_RANGE and has a value in the range of 0 to 4:
• 0: "normal"
• 1: "high"
• 2: "low"
• 3: "high-high"
• 4: "low-low"
The range information changes and the new values are reported.
GUID-0307BE4E-9895-4353-8006-6B609B43ACA9 V1 EN
Figure 700: Presentation of operating limits
The range information can also be decoded into boolean output signals on some of the
measuring functions and the number of phases required to exceed or undershoot the
limit before activating the outputs and can be set with the Num of phases setting in the
three-phase measurement functions CMMXU and VMMXU. The limit supervision
boolean alarm and warning outputs can be blocked.
1MRS759142 C
REX640
Technical Manual