L2275
Emax UL
40/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
linst setting dip-switch
lins
t se
tting
lab
el
In the label diagrams relative to the settings, the position of
the dip-switch is indicated by the white part.
In the diagram,
the dip-switch is set in the
top position ( Off)
13.8
Warning functions
13.8.1
Warning Threshold
When the maximum current (phase or neutral) exceeds the 0.9*I1 threshold (where I1 is the set threshold of function L) the “warning” LED
is lit and the warning message is displayed (see par. 13.17).
13.8.2
Harmonic distortion
The PR112 unit signals that a peak factor abo ve 2.1 has been exceeded (see par.13.7.1) with a warning message (see par. 13.17) and the
“warning” LED lighting up (remember that the IEC 60947-2 annex “F” foresees that the protection unit functions regularly with a peak factor
of
≤
2.1, up to 2x In).
For reclosing, adjustable tc1 fixed time timing is applied.
The closing control for load n°1 is sent when I < Ic1 (for the fixed time set with tc1).
The opening control for load n°1 is sent when I > Ic2 (for the time curve). At this point the protection is disabled and a message appears for “load
2 open”.
To re-enable operation of the protection on load n°1, it is necessary to press the “reset” key on the current page.
“Num.AR” indicates the number of load reclosing operations carried out.
“MaxAR” indicates the maximum number of reclosing operations which can be carried out (settable values: 1...9 reclosing operations, step 1
reclosing)
When “Num.AR = MaxAR”, reclosing is disabled (a message appears for “auto-reclosing disabled”).
To re-enable it, it is necessary to reset the “Num. AR” (entering “edit” mode on the protection setting page).
13.7.8 Protection against instantaneous short-circuit “Iinst”
This function has a single protection curve with fixed time.
When the protection trips, the circuit-breaker opens by means of the opening solenoid (SA).
13.7.8.1
Selection of the threshold value
To set the Iinst protection correctly, linked to the size of the circuit-breaker, work on the relative 10 dip-switches located on the part above the
release (see figure), consulting the label placed at its side.
The protection, which can only be set by personnel ABB, cannot be excluded.
The opening command to load n°1 is sent when I > Ic1 (for the time curve).
At this point the protection is disabled and a message appears for “load 1 open”.
The opening command to load n°2 is sent when I > Ic2 (for the time curve).
At this point the protection is disabled and a message appears for “load 2 open”.
To re-enable the protections on load n°1 (or n°2) to operate, it is necessar y to press the “reset” key on the current page.
13.7.7.2
Connection - Disconnection of a load
Ic1= load n°1 connection threshold
Ic2= load n°1 disconnection threshold
t (Ic1) = waiting time for reconnection of the load
t (Ic2) = waiting time for disconnection of the load
The protection is excludable, for both the checks, by selecting the [Off] value for the threshold.
Functionality:
The disconnection protection uses trip cur ves similar to those used b y protection “L”, but with lower thresholds and shorter times.
The trip curves to be used are those of protection “L”.
No ther mal memory is f oreseen. Operation with ther mal memory “L” connected could cause abnormal behaviour.
The modification of the setted threshold may cause
permanent damages to the circuit breaker itself and
the plant with conseguent harms to the operator
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