Function Block - ABB RELION REX640 Technical Manual

1MRS759142 C
8.1.6.2
8.1.6.3
8.1.6.4
REX640
Technical Manual

Function block

GUID-823C9146-B3EA-4F8C-A2BE-BD212ADC3987 V2 EN
Figure 705: Function block symbol
Functionality
The single-phase voltage measurement function VAMMXU provides limit value
supervision output (HIGH_ALARM, HIGH_WARN, LOW_WARN, LOW_ALARM).
Instantaneous single-phase voltage in volt is available for application configurations
through output U_INST. Phase voltage demand value in volt is for connecting to Load
profile recorder (LDPRLRC) through output U_DMD.
Analog channel configuration
VAMMXU has one analog group input which must be properly configured.
Table 1229: Analog inputs
Input
U3P
See the preprocessing function blocks in this document for the
possible signal sources.
There are a few special conditions which must be noted with the configuration.
Table 1230: Special conditions
Condition
U3P connected to real measurements
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings. For
troubleshooting, check the contents of this chapter and also the preprocessing blocks
in this document. The configuration can be written to the protection relay once the
mismatch is corrected.
Measurement functions
Description
Voltage group signal
Description
The function requires that the first phase voltage
U_A or U_AB is connected.
Section 8
1307