TB MRF3 04.01 E
19
The relays are assigned as follows:
LEDs f
1
, f
2
, f
3
,f
4
, df
1
and df
2
are two-coloured and light
up
green
when the output relays are assigned as
alarm relays
and LEDs tf
1
, tf
2
, tf
3
, tf
4
, dt
1
and dt
2
red
as
tripping relays
.
Definition:
Definition:
Alarm relays
are activated at pickup.
Tripping relays
are only activated after elapse of the
tripping delay.
After the assignment mode has been activated, first
LED U< lights up green. Now one or several of the
four output relays can be assigned to under voltage
element U< as alarm relays. At the same time the se-
lected alarm relays for under voltage element 1 are
indicated on the display. Indication "1_ _ _" means
that output relay 1 is assigned to this under voltage
element. When the display shows "_ _ _ _", no alarm
relay is assigned to this under voltage element. The as-
signment of output relays 1 - 4 to the current elements
can be changed by pressing <+> and <-> push but-
tons. The selected assignment can be stored by press-
ing push button <ENTER> and subsequent input of the
password. By pressing push button <SELECT/RESET>,
LED U< lights up red. The output relays can now be
assigned to this voltage element as tripping relays.
Relays 1 - 4 are selected in the same way as de-
scribed before. By repeatedly pressing of the
<SELECT/RESET> push button and assignment of the
relays all elements can be assigned separately to the
relays. The assignment mode can be terminated at any
time by pressing the <SELECT/RESET> push button for
some time (abt. 3 s).
Note:
•
The function of jumper J2 described in general de-
scription "MR Digital Multifunctional Relays" does
not apply for
MRF3
. For relays without assignment
mode this jumper is used for parameter setting of
alarm relays (activation at pickup or tripping).
A form is attached to this description where the setting
requested by the customer can be filled-in. This form is
prepared for telefax transmission and can be used for
your own reference as well as for telephone queries.
Relay function
Output relays
Display-
Corres-
ponding
1
2
3
4
Indication
LED
f
1
Alarm
X
1 _ _ _
f
1
green
tf
1
Tripping
X
1 _ _ _
tf
1
red
f
2
Alarm
X
1 _ _ _
f
2
green
tf
2
Tripping
X
1 _ _ _
tf
2
red
f
3
Alarm
X
_ 2 _ _
f
3
green
tf
3
Tripping
X
_ 2 _ _
tf
3
red
f
4
Alarm
X
_ _ 3 _
f
3
green
ff
4
Tripping
X
_ _ 3 _
tf
3
red
df/dt
1
Tripping
X
_ _ _ 4
dt
1
red
df/dt
1
Tripping
X
_ _ _ 4
dt
2
red
Table 5.3: Example of assignment matrix of the output relay (default settings)
Summary of Contents for MRF3
Page 1: ...MRF3 Frequency Relay...
