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90
NC20 - Manual - 01 - 2015
FUNCTION CHARACTERISTICS
If the CLP function (Cold Load Pick-up) is enabled for element blocking, the selected threshold may
be blocked for an adjustable time interval, starting from the circuit breaker closure.
This operating mode may be select by setting
ON-Element blocking
the
ICLP>> Mode
and/or
ICLP>>> Mode
parameters.
If the CLP function (Cold Load Pick-up) is enabled for threshold change, the selected threshold may
be changed for an adjustable time interval, starting from the circuit breaker closure.
This operating mode may be select by setting
ON-Change setting
the
ICLP>> Mode
and/or
ICLP>>> Mode
parameters, whereas the operating thresholds within the CLP may be adjusted in-
side the
Set \ Profi le A(or B) \ Phase overcurrent-50/51 Fundamental \
I>> Element
(
I>>> Element) \ Def-
inite time
menus.
For both operating modes the CLP Activation time parameters (
tCLP>>, tCLP>>>
) may be ad-
justed inside the
Set \ Profi le A(or B) \ Phase overcurrent-50/51 Fundamental \
I>> Element
(
I>>>
Element) \ Setpoints
menus.
For every of the two thresholds the following block criteria are available:
Logical block (Block1)
If the
I>>BLK1
and/or
I>>>BLK1
enabling parameters are set to
ON
and a binary input is de-
signed for logical block (Block1), the concerning element is blocked off whenever the given input is
active.
[1]
The enabling parameters are available inside the
Set \ Profi le A(or B) \ Phase overcurrent-
50/51 Fundamental \
I>> Element
(
I>>> Element) \Setpoints
menus, while the
Block1
function must
be assigned to the selected binary input inside the
Set \ Inputs \ Binary input IN1(x)
menus.
Note 1 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside
CONTROL AND MONITOR-
ING
section
all-F50-51F.ai
General logic diagram of the phase overcurrent elements - 50/51 Fundamental
I
L1
I
L2
I
L3
I
L1
I
L2
I
L3
I>> inhibition
BLK1I>>>
I>>> Element
Start I>>>
towards
50/51RMS
towards
50/51RMS
Start I>>>
Trip I>>>
&
I>> disbyI>>>
Start I>>>
&
I> disbyI>>>
t
>>> def
ICLP>>>
def
I>>>
def
ICLP>>>Mode
tCLP>>>
t
>>>RES
I>> Element
Start I>>
Trip I>>
Start I>>
&
I>AL disbyI>>
Start I>>
&
I>AL disbyI>>
t
>> def
ICLP>>
def
I>>
def
ICLP>>Mode
tCLP>>
t
>>RES
I>> Enable
I>>> Enable
CLPI>>
CLPI>>>
I>>>BF
Trip I>>>
&
I>>>BF
I>>BF
I>> Trip
&
I>>BF
BLK2OUT
I>>BLK2OUT
Start I>>
&
BLK2OUT
I>>>BLK2OUT
Start I>>> &
Start I>>
&
I> disbyI>>
BLK1I>>
&
I>>BLK1
Block1
Start I>>
&
&
I>>>BLK1
Block1
Start I>>>
&
&
I>>BLK2IN
BLK2INI>>
Block2
Start I>>
&
&
I>>>BLK2IN
Block2
BLK2INI>>>
Start I>>>
&