TB MRF3 04.01 E
21
•
Normal measuring values are selected by pressing
the <SELECT/RESET> button.
•
When then the <-> button is pressed, the latest fault
data set is shown. By repeated pressing the <->
button the last but one fault data set is shown etc.
For indication of fault data sets abbreviations FLT1,
FLT2, FLT3, ... are displayed (FLT1 means the latest
fault data set recorded). At the same time the pa-
rameter set active at the occurence is shown.
•
By pressing <SELECT/RESET> the fault measuring
values can be scrolled.
•
By pressing <+> it can be scrolled back to a more
recent fault data set. At first FLT8, FLT7, ... are al-
ways displayed.When fault recording is indicated
(FLT1 etc), the LEDs flash in compliance with the
stored trip information, i.e. those LEDs which
showed a continuous light when the fault occured
are now blinking blinking to indicate that it is not a
current fault. LEDs which were blinking blinking dur-
ing trip conditions, (element had picked up) just
briefly flash.
•
If the relay is still in trip condition and not yet reset
(TRIP is still displayed), no measuring values can be
shown.
•
To delete the trip store, the push button combina-
tion <SELECT/RESET> and <->, has to be pressed
for about 3s. The display shows “wait”.
Recorded fault data:
Measuring
Displayed value
Correspon-
ding LED
Voltage
1-phase measuring
U
Frequency
f, f
min
,f
max
f; min; max
Frequency chang-
ing rate
df, df
min
df
max
df; min; max
Time stamp
Date:
Y = 99
M = 03
D = 10
#
#
#
Time:
h = 17
m = 21
s = 14
#
#
#
5.9.1
Reset
MRF3
has the following 3 possibilities to reset the dis-
play as well as the output relays at jumper position
J3 = ON.
(see also chapter 4.2 of description "
MR
-Digital Multi-
functional Relays".
Manual reset
•
by pressing push button <SELECT/RESET> for
some time (abt. 3 secs.).
Electrical reset
•
by applying aux. voltage to C8/D8.
Software reset
•
software reset has the same effect as the
<SELECT/RESET> push button. Please also refer
here to the communication protocol of RS 485 in-
terface.
Resetting the display is only possible when there is no
pickup anymore (otherwise signal "TRIP" will still remain
in the display and the relays remain activated). Reset-
ting the relay does not change the preset parameters.
Summary of Contents for MRF3
Page 1: ...MRF3 Frequency Relay...
