L2275
Emax UL
72/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
15.2.7.2
Network frequency
The PR113 unit constantly measures the frequency of the network voltages it is connected to. When there are no voltages (Umax < 0.1Un),
determination is carried out on the currents (if Imax >0.1In).
If the frequency goes out of the permitted range by ±10% in relation to the nominal frequency selected (50 or 60Hz), the “warning” LED is lit and
the warning message is displayed (see par. 15.6).
Signaling can be combined with one of the internal relays or with those of the PR020/K unit.
Precision of frequency determination is ± 0.1Hz.
15.2.7.3
Harmonic distortion
The PR113 unit signals that a peak factor above a 2.1 has been exceeded with a warning message and the “warning” LED lighting up (see par.
15.2.8.4.2) (remember that the IEC 60947-2 annex “F” Standard foresees that the protection unit must function regularly with a peak factor
≤
2.1,
up to 2xIn).
Signaling can be combined with one of the internal relays or with those of the PR020/K unit.
15.2.7.4
Stato interruttore
When there is an auxiliary power supply, the PR113 unit determines the status of the power circuit breaker by means of special cabling on the
power circuit breaker. In the case where the presence of current is determined with the power circuit breaker in the “OPEN” status, a status error
is signaled by means of display of a warning message (see par. 15.6) and the “warning” LED lighting up.
Signaling can be combined with one of the internal relays or with those of the PR020/K unit.
15.2.8 Measurement functions
The measurements are always available when there is an auxiliary power supply. In the case of self-supply, the sum of the entering currents must
exceed a certain value (see par. 15.2.2.1) for the display to be activated. Both with Vaux and self-supply, the display is lit after a few seconds
(see par. 15.2.2) from when the PR113 itself is turned on.
The indication “ ……”
corresponds to a value under the minimum measurable.
The indication “ > xxxx” corresponds to a value over the maximum measurable.
The indication “ -----”
corresponds to disabling of the calculation of the value.
15.2.8.1
Current measurements
The measurement of current for the ground fault is disabled when the current of one of the phases exceeds a defined value (see par. 15.2.6.5).
Range
0.4….2xIn
Measurement precision
2 %
15.2.8.2
Voltage measurements
The PR113 unit is able to provide voltage measurement of the three phases, of the relative line-to-line
voltages and of the residual voltage both with self-supply and with an auxiliary power supply.
You access the page from the current measurement one using the
↓
key (
↑
to go back).
The minimum value of voltage measurable is 0.05xUn (5% of the nominal).
The maximum value of current measurable is 1.2xUn.
Measurement precision
1 %
Values obtained with class 0.5. voltage sensors (see note A al par.15.3.2.1)
The PR113 unit is able to provide current measurement of the three phases, of the neutral and of the ground
fault, both with self-supply and with an auxiliary power supply. The ground fault current takes on two different
meanings according to whether the internal “Ground Fault” toroid is selected or the external “Source Ground
Return” one.
You access the page from the default one by using the
↓
key (
↑
to go back).
The minimum value of current measurable is 0.1xIn (10% of the nominal).
The maximum value of current measurable is 16xIn.