Woodward
Manual MRM3-2 GB
36
TD_MRM3-2_09.08_GB_Rev.New
5.10 Measuring Value and Fault Indications
5.10.1 Measuring Value Indications
The following measuring values can be displayed during normal operation:
•
Current in phase 1 (LED L1 green),
•
Current in phase 2 (LED L2 green),
•
Current in phase 3 (LED L3 green),
•
Earth current (LED E green),
•
Load unbalance current (LED I2 green),
•
Temperature
equivalent
ϑ
> in % (LED
ϑ
> red),
•
Operating hours (LED h yellow)
•
Number of motor starts (LED No. green)
•
Time until tripping in min. (LED Trip/t> red)
•
Remaining time of start blocking in min. (LED Start/Block green and t> red)
•
Date and time (LED
green)
5.10.2 Units of the Displayed Measuring Values
Indication of the measuring value can be represented in the display optionally as multiple of the
secondary rated current (x In) or as primary current (A).
Consequently the units displayed are changing, i.e. for:
Phase Current
Indicated as
Range
Unit
Secondary current
.000 – 40.0
x In
Primary current
.000 – 999.
k000 – k999
1k00 – 9k99
10k0 – 99k0
100k – 999k
1M00 – 2M00
A
kA*
kA
kA
kA
MA
* for rated transformer current starting at 2kA
Earth Current
Indicated as
Range
Unit
Secondary current
.000 – 15.0
x In
Primary earth current
.000 – 999.
k000 – k999
1k00 – 9k99
10k0 – 99k0
100k – 999k
1M00 – 2M00
A
kA*
kA
kA
kA
MA
* for rated transformer current starting at 2kA
5.10.3 Indication of the Fault Data
All fault events acquired by the relay are optically indicated on the front cover. For the MRM3-2 the
four LEDs (L1, L2, L3, I2; E) and the functional LEDs (
ϑ
>; I
B
>; I<; I>, I>>, I2> and I
E
>) are provided.
Not only fault signals are put out but also the activated protective function is indicated. If, for in-
stance, over current occurs, the LEDs assigned to the respective phases are flashing. LED I>
comes on also at the same time. After elapse of the trip-ping time the flashing LEDs change to
permanent light.
