18
TB MRF3 04.01 E
5.7
Additional functions
5.7.1
Setting procedure for blocking the
protection functions
The blocking function of the
MRF3
can be set accord-
ing to requirement. By applying the aux. voltage to
D8/E8, the functions chosen by the user are blocked.
Setting of the parameter should be done as follows:
•
When pressing push buttons <ENTER> and <TRIP>
at the same time, message "BLOC" is displayed (i.e.
the respective function is blocked) or "NO_B" (i.e.
the respective function is not blocked). The LED allo-
cated to the first protection function U< lights red.
•
By pressing push buttons <+> <-> the value dis-
played can be changed.
•
The changed value is stored by pressing <ENTER>
and entering the password.
•
By pressing the <SELECT/RESET> push button, any
further protection function which can be blocked is
displayed.
•
Thereafter the menu is left by pressing
<SELECT/RESET> again.
•
If the <SELECT/RESET> key is actuated again, the
blocking menu is left and the assignment mode is
accessed^.
Function
Description
Display LED
f1
Frequency step 1
BLOC
green
f2
Frequency step 2
BLOC
green
f3
Frequency step 3
NO_B
green
f4
Frequency step 4
NO_B
green
df/dt1
Frequency gradient 1
BLOC
green
df/dt2
Frequency gradient 2
BLOC
green
Table 5.2
:
Blocking function for two parameter sets
Assignment of the output relays:
Unit
MRF3
has five output relays. The fifth output relay
is provided as permanent alarm relay for self supervi-
sion is normally on. Output relays 1 - 4 are normally
off and can be assigned as alarm or tripping relays to
the voltage functions which can either be done by us-
ing the push buttons on the front plate or via serial in-
terface RS485. The assignment of the output relays is
similar to the setting of parameters, however, only in
the assignment mode. The assignment mode can be
reached only via the blocking mode.
By pressing push button <SELECT/RESET> in blocking
mode again, the assignment mode is selected.
Summary of Contents for MRF3
Page 1: ...MRF3 Frequency Relay...
