Figure 498: 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.
Table 889: Settings for limit value supervision
Function
Settings for limit value supervision
Three-phase current measurement
(CMMXU)
High limit
A high limit
Low limit
A low limit
High-high limit
A high high limit
Low-low limit
A low low limit
Three-phase voltage measurement
(VMMXU)
High limit
V high limit
Low limit
V low limit
High-high limit
V high high limit
Low-low limit
V low low limit
Residual current measurement (RE-
SCMMXU)
High limit
A high limit res
Low limit
-
High-high limit
A Hi high limit res
Low-low limit
-
Frequency measurement (FMMXU)
High limit
F high limit
Low limit
F low limit
High-high limit
F high high limit
Low-low limit
F low low limit
Residual voltage measurement (RE-
SVMMXU)
High limit
V high limit res
Table continues on the next page
1MRS757644 H
Measurement functions
620 series
Technical Manual
929