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12.6 Load control function
Single loads can enabled/disabled the load side before the overload protection intervenes and trips the circuit-breaker the supply
side.
34/1 08
.0 step 0.05xIn
Threshold LC1________________ 50% 100% step xI,
Threshold LC2________________50% 100% step x^
From the PR122/DC you can associate each the PR120/K PR121/K contacts with configuration (NO NC), delay and the eventual latch.30 10.
12.
(3) no-trip tim e
12. 14..1.2.1 Table measurements
For all cases not covered the above hypotheses, the follow ing tolerance values
apply:
Protections Trip threshold Trip time
L elease 1,05 1,25 20%
S 10% 20%
I 15% 60m s
O 20%
Type measurement
Range values measured the relay
Standard operation range
Range Tolerance %
Current 0,05 .
The function active when auxiliary power supply present, supply from PR120/V (see par..0xIn I5< 10xIn
step 0.9.. 5
Model 3447
A pparatus Emax DC
S cale
D 1SDH000635R0002
Page No.2.7 Summary table the protection function settings for the PR122/DC
Protection
Disabling
Disablingof
TRIPonly
Zoneselectivity
Start-upthreshold
Í
0
E
e
E
<s
E
<5
ř
Trip Threshold Trip Time Trip
threshold
tolerance <2>
Trip time
tolerance <2>
L
curve
IEC 60255-8
□ 0,4xIn Ifl 1xIn
step 0,01xIn
3 102s(1), step s
t 3Ifl
Release between
,05 and xI1
± 10%, 4In
± 20%, 4In
g
S
(t k)
H 0,6 xIn <10xIn
step 0,1xIn
0,6 xIn <10xIn2start-up
step 0,1xIn
0,05 t2< 0,35 step 0,01s
0,10 t2stait_up< step 0,01s
0,04 t2sel 0,20 step 0,01s
± ,Ig< In
± In
T ta
± 10% s
S
(t= k/i2)
H 0,6xIn <10xIn
step 0,1xIn
0,05 t2< 0,35 s,
step 0,01 10xIn
± ,Ig< In
± 10% ,Ig> In
± 15%, 4In
± 20%, 4In
g
I
(t= k)
H 1,5xIn I3< 10xIn
step 0,1xIn
< ms
0,10 t2^ step 0,01 s
where I>I4
± 10%
MCR
(t= k)
H 6.
Thresholds LC1 and LC2 are expressed percentage Ifl (current threshold specified for protection while the "warning current" Iwis expressed
as absolute value.9.3)
The operating logic involves the activation three contacts when the preset thresholds LC1, LC2 and Iware exceeded. This done contactors switch-disconnectors (wired outside the release), controlled the PR122/DC means contacts the
PR120/K module the PR021/K external unit.1xIn
< ms(3) 10%
k)
=
of
□ Fixed, defined by
SACE
Instantaneous 5°C -
linst Automatic, defined
by SACE
Instantaneous
LC1/LC2 loads
control
H 50%-100% step 0,05xI1
Warning 0,3-10I step 0,05xI’ 10% 10+40 ms
(1) The value trip regardle typ curve set (self
protection). 0,3 .. 0,05 .9.2...7.
(2) These tolerances are based follow ing assum ptions:
- relay ithout start-up)
- preset trip tim 100 ms. The allowable values are given the following table:
Warning current 0.
The current thresholds are lower than those available with the protection that the load control can used prevent tripping due overloads
