Woodward
Manual MRM3-2 GB
32
TD_MRM3-2_09.08_GB_Rev.New
5.9 Additional
Functions
5.9.1 Blocking of the Protective Functions
Blocking of the protective functions
After voltage has been applied to blocking input D8/E8, the intended reaction for each of the
protective functions can be defined individually. (Observe voltage adjustment !) See chapter 3.1.4
Setting
Effect when voltage has been applied to the blocking input
PR_B
Complete blocking of the protective element. Activation and trip are suppressed.
TR_B
Blocking of trip elements.
The individual protective elements are activated and this is signalled accordingly, but
there is no tripping.
BLOC
Complete blocking of the protective element. Activation and tripping are suppressed.
This is displayed if it is not differentiated between PR_B and TR_B in a parameter.
NO_B No
blocking.
This element operates normal, it is not blocked
Table 5.2: Adjustment Possibilities
Setting of parameters should be done as follows:
•
To come to the blocking menu push-buttons <ENTER> and <TRIP> are to be pressed at
the same time. The function being set is indicated by LEDs.
•
If necessary the blocking function can be changed with <+> or <-> and saved with
<ENTER> Perhaps a password has to be entered.
•
Proceed to the next function with <SELECT/RESET>
•
After selection of the last blocking function settings for the 2nd parameter set can follow.
•
For allocating the RESET function press push-button <SELECT/RESET> again. (See next
chapter).
Symbol Protective Function
Default
Setting
Possible Settings
LED/Colour
ϑ
>
Overload warning element NO_B
NO_B ; BLOC
ϑ
> red
I
B
> x k
Overload element
NO_B
NO_B ; PR_B ; TR_B I
B
>
green/
τ
W
green
I<
Undercurrent element
NO_B
NO_B ; PR_B ; TR_B I< red
I>
Over current element
NO_B
NO_B ; PR_B ; TR_B I> red
I>>
Start
Short-circuit element at
start-up
BLOC
NO_B ; PR_B
I>> red/Start green
I>> Short-circuit
element
dur-
ing operation
PR_B
NO_B ; PR_B ; TR_B I>> red
I2>
Load unbalance element
NO_B
NO_B ; PR_B ; TR_B I2> red
I
E
>
Earth current element
NO_B
NO_B ; PR_B ; TR_B I
E
> red
tCBFP
CB failure protection
NO_B
NO_B ; BLOC
CB green
Trip
External trip
NO_B
NO_B ; BLOC
Trip red
Table 5.3: Default Setting of the Blocking Functions
