Load Control Function; Summary Table Of The Protection Function Setting For The Pr122/Dc; Table Of Measurements - ABB Emax DC L3447 Installation And Service Instructions Manual

12.2.9.6

Load control function

Single loads can be enabled/disabled on the load side before the overload protection L intervenes and trips the circuit-breaker on the supply
side. This is done by contactors or switch-disconnectors (wired outside the release), controlled by the PR122/DC by means of contacts on the
PR120/K module or on the PR021/K external unit.
The current thresholds are lower than those available with the protection L, so that the load control can be used to prevent tripping due to overloads.
The function is active when an auxiliary power supply is present, or supply from PR120/V (see par. 14.1.3)
The operating logic involves the activation of three contacts when the preset thresholds LC1, LC2 and I
Thresholds LC1 and LC2 are expressed as a percentage of I
as an absolute value. The allowable values are given in the following table:
Warning current Iw
Threshold LC1
Threshold LC2
From the PR122/DC you can associate each of the PR120/K or PR121/K contacts with a configuration (NO or NC), a delay and the eventual latch.
12.2.9.7 Summary table of the protection function settings for the PR122/DC
Protection
L
curve
IEC 60255-8
S
(t=k)
S
(t=k/i )
2
I
(t=k)
MCR
(t=k)
O T
(temp=k)
Iinst
LC1/LC2 loads
control
Warning Iw
The minimum value of this trip is 1s regardless of the type of curve set (self-
(1)
protection).
These tolerances are based on the following assumptions:
(2)
- relay at full power (without start-up)
- preset trip time ≥ 100 ms.
no-trip time
(3)

12.2.9.7.1 Table of measurements

Type of measurement
Current 0,05 ... 12 In
L3447
Model
L3728
(current threshold specified for protection L) while the "warning current" I
1
0.30 ÷ 10.0 step 0.05xIn
50% ÷ 100% step 1% xI
1
50% ÷ 100% step 1% xI
1
Trip Threshold
0,4xIn ≤ I
1
step 0,01xIn
0,6 xIn ≤ I
2
step 0,1xIn
0,6 xIn ≤ I
2 start-up
step 0,1xIn
0,6xIn ≤ I
2
step 0,1xIn
1,5xIn ≤ I
3
step 0,1xIn
6.0xIn ≤ I
5
step 0.1xIn
Fixed, defined by
SACE
Automatic, defined
by SACE
50%÷100% step 0,05xI
0,3÷10I step 0,05xI
n
Range of values measured by the relay
0,05 ... 12 In
Trip Time
≤ 1xIn 3 s ≤ t ≤ 102s
1
t1@ 3I
1
≤10xIn 0,05 s ≤ t ≤ 0,35 s, step 0,01s
2
0,10 s ≤ t ≤ 30 s, step 0,01s
2 start-up
≤10xIn 0,04 s ≤ t ≤ 0,20 s, step 0,01s
2 sel
≤10xIn 0,05 s ≤ t ≤ 0,35 s,
2
step 0,01 s at 10xIn
≤ 10xIn ≤ 30 ms
0,10 s ≤ t ≤ 30 s, step 0,01 s
2 start-up
where I>I4
≤ 10xIn ≤ 30 ms
(3)
Instantaneous
Instantaneous
1
n
For all cases not covered by the above hypotheses, the following tolerance values
apply:
Protections Trip threshold
L Release between 1,05 e 1,25 x I1
S ± 10%
I ± 15%
Others
Apparatus
Doc. No.
are exceeded.
w
Trip
threshold
tolerance
, step 3 s
(1)
Release between
1,05 and1,2 xI1
±7%,I ≤ 6 In
g
±10%,I > 6 In
g
± 7%,I ≤ 6 In
g
± 10%,I > 6 In
g
± 10%
± 10%
± 5°C
± 10%
Trip time
± 20%
± 20%
≤ 60ms
± 20%
Standard operation range
Range
0,3 ... 4 In
Emax DC
1SDH000635R0002
is expressed
w
Trip time
tolerance
(2)
(2)
± 10%, I ≤ 4In
g
± 20%, I > 4In
g
The best of the two data
± 10% o 40 ms
± 15%, I 4In
≤
g
± 20%, I 4In
>
g
- - -
10÷40 ms
Tolerance %
± 5
Scale
Page No.
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