TB MRF3 04.01 E
5
3.1.1
Analog input circuits
The analog input voltage is galvanically insulated via
the input transformer of the relay and the signal is
passed through an active low pass filter. The fre-
quency is detected from the square wave voltages
which are formed via comporators. The external wiring
of the measuring circuits as well as the auxiliary volt-
age are shown in the connection diagram.
3.1.2
Output relays
The
MRF3
has 5 output relays with change-over con-
tacts:
Output relay 1:
C1, D1, E1 and C2, D2, E2
Output relay 2:
C3, D3, E3 and C4, D4, E4
Output relay 3:
C5, D5, E5
Output relay 4:
C6, D6, E6
Output relay 5:
Self-supervision (internal fault of
the relay) C7, D7, E7
All relays are normally off, only the self-supervision re-
lay is normally on.
3.1.3
Blocking input
The parameters for the blocking function are free ad-
justable. Application of the aux. voltage to D8/E8
blocks all protection functions of the device for which
the parameters were set previsouly, refer Table 5.2
3.1.4
External reset input
Refer chapter 5.9.1
Содержание MRF3
Страница 1: ...MRF3 Frequency Relay...
