L2275
Emax UL
41/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
13.9
Measurement functions
13.9.1
Current measurements
The PR112 unit is always able to provide measurement of the currents in the three phases, in the neutral and for ground fault (ammeter function),
both with self-supply and with auxiliary power supply.
The “……A” indication corresponds to a current reading under the measurable minimum.
The “—— A” indication corresponds to disabling of current measurement (greater than 4 In for ground fault).
The ground fault current takes on two different meanings according to whether the internal “Ground Fault” toroid or the external “Ground Source
Return” one is selected.
The minimum value of current measurable is 0.1 In (10% of the nominal).
The maximum value of current measurable is 16 In.
In Range
0.3....6.0In
Measurement precision
5%
13.10
Information functions
13.10.1 Software version
Whenever it is necessary to notify ABB SACE of operating problems with the unit, it is advisable to indicate the SW version of the PR 112 unit.
ABB SACE
Heading
PR112/P-A Sw : x.xx
Software version of the PR112 unit/P-A
13.10.2 Opening data storage
The function of opening data storage (“TRIP” = opening for protection) is only active when there is an Auxiliary power supply before, during and
after (for at least 1 sec.) any opening of the power circuit breaker due to trip for protection by the trip unit.
The function and also consultation of the page which shows the last data stored are therefore only available when there is an auxiliary power
supply. In self-supply, the attempt to access the page makes a “function not available” message appear.
The percentage of contact wear is indicative of the electrical life of the EMAX power circuit breaker electrical contacts.
The functionality of the trip unit is not in any way modified by the presence of the wear messages. The alarm message indicates that it is necessary
to check the state of contact wear.
The percentage of wear depends on the number of openings carried out by the power circuit breaker and on the absolute current interrupted during
each of these.
13.10.2.1 Display of opening data
N°Open:xxxxx x PROT
Number of openings due to protections L, S, I and G and T for the PR112/P-A versions.
L1:xxxxxA
L2:xxxxxA
Value of the currents interrupted during the last TRIP on L1 and L2
L3:xxxxxA
Ne:xxxxxA
Value of the currents interrupted during the last TRIP on L3 and Ne
Wear:xxx%
Gr:xxxxxA
Contact wear and ground fault current (only for versions LSIG)
In the case of trip for Iinst, the following page is displayed (without the values of the interrupted currents):
N°Open:xxxxx I PROT
Total number of openings carried out up to now by the power circuit breaker
Short circuit
Indication of trip against short circuit
Current > Icw
Wear:xxx%
Contact wear
13.11
Other functions
13.11.1
Contact programming K51/p1
The PR112 is fitted with a trip unit, whose contact is called K51/p1.
This can signal different situations, selectable by the user among those listed in the following table.