Mcs 3I; Mcs 3U - ABB REX 521 Technical Reference Manual, Standard Configurations

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7.4.3.
7.4.4.
Protection Relay
Technical Reference Manual, Standard Configurations
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ALARM
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MCS 3I

The supervision function block MCS 3I detects interruptions in energizing circuits.
The function block supervises the energizing circuits by comparing the measured
phase currents. If one or two phase currents exceed the setting "High limit", while
the measured phase current in the remaining one or two phases is below the setting
"Low limit", the output ALARM is activated after the adjustable alarm delay.
The function block is disabled if all input currents are below the setting "Low limit".
The ALARM output will reset automatically when the fault disappears.
The phase current supervision function block operates on the numerically calculated
fundamental frequency component of the phase currents.
MCS 3I
ALARM
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MCS 3U

The supervision function block MCS 3U detects interruptions in energizing circuits.
The user can select three-phase or two-phase operation. The function block can also
be set out of use by means of the parameter.
The function block supervises the energizing circuits by comparing the measured
voltages. If one or two voltages exceed the setting "High limit", while the measured
values of the remaining one or two voltages are below the "Low limit", the output
ALARM is activated after the set alarm delay.
The function block is disabled if all input voltages are below the setting "Low limit".
The ALARM output resets automatically when the fault disappears.
MCS 3U
ALARM
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