Function Block - ABB RELION REX640 Technical Manual

Section 8
Measurement functions
8.1.5.2
8.1.5.3
8.1.5.4
1302

Function block

GUID-F37B930B-9C09-4CF9-B47A-A1587538BBD9 V2 EN
Figure 704: Function block
Functionality
The three-phase voltage measurement function VMMXU provides limit value
supervision output (HIGH_ALARM, HIGH_WARN, LOW_WARN, LOW_ALARM).
Setting parameters On delay time and Off delay time are used for controlling the
activation and the deactivation of alarm and warning outputs.
Instantaneous phase-to-phase and phase-to-earth voltages in volts are available for
application configurations through outputs U_INST_AB, U_INST_BC and
U_INST_CA and U_INST_A, U_INST_B and U_INST_C, respectively.
Phase current demand values in volts are for connecting to Load profile recorder
(LDPRLRC) through outputs I_DMD_A, I_DMD_B and I_DMD_C.
Analog channel configuration
VMMXU has one analog group input which must be properly configured.
Table 1221: 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.
Description
Three-phase voltages
1MRS759142 C
REX640
Technical Manual