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2.
The second set parameters (set can enabled by:
- digital input provided with the PR120/K module.
13.
In operation, the state (set and set indicated the display.9.
13.2.9.
The current thresholds are lower than those available with the protection that the load control can used prevent tripping due overloads.2.12 Double protections setting
Using the double protections setting, the PR123/DC can save set alternative parameters for all the protections. enable it, see par.
Model 3447
A pparatus Emax DC
S cale
D 1SDH000635R0002
Page No.
Thresholds LC1 and LC2 are expressed percentage Ifl (current threshold specified for protection while the "warning current" Iwis expressed
as absolute value.1 Protection “UV”
When the minimum phase voltage drops below the set threshold U8the protection counts down the preset time interval and then opens.5.
The minus sign ('-') front the threshold and power indicates reverse power. 13.10.1.
The double setting disabled default.9 Load control function
Single loads can enabled/disabled the load side before the overload protection intervenes and trips the circuit-breaker the supply
side.
The function active when auxiliary power supply power PR120/V-PR120/LV module present (see par. For instance, can connected auxiliary contact bus-tie;
- communication network, means the PR120/D-M (e. The passage from set set can made when there change
in the mains configuration when there emergency capable changing the load capacity and the short-circuit levels. 13.5. This done contactors switch-disconnectors (wired outside the release), controlled the PR123/DC means contacts the
PR120/K module the PR021/K external unit. fact, the case where the circuit-breaker is
open and current detected, the timing leads the "alarm" state and not "TRIP".
When the total reverse active power (sum the power the polarity) exceeds the set reverse active power threshold the protection counts
down the preset time interval and then opens.05xIn
Threshold LC1_______________ 50% 100% step xI,
Threshold LC2_______________ 50% 100% step x^
From the PR123/DC you can associate each the PR120/K PR121/K contacts with configuration (NO NC), delay and any latch.2.g.2.9.10 Voltage protections “UV”, “OV”
The PR123/DC unit provides voltage protections, which can disabled, with fixed adjustable time k), active both with self-powering and
with auxiliary supply:
- Undervoltage “UV”
- Overvoltage “OV”
Apart from the normal timing and "TRIP" operation, the voltage protections can state defined "alarm" (with the "emergency" led and
an alarm message displayed) providing there auxiliary PR120/V module power supply.30 10.13.
13.00 step 0. The threshold indicated percentage "Pn", where "Pn"
is the nominal power the circuit-breaker. when the switch scheduled);
- directly from the user interface the PR123/DC (see settings menu par.3). When the circuit-breaker closed the passage of
a current detected, you pass immediately from the state "alarm" "TRIP" without timing. The second set parameters
(set can replace the default set (set means external com and. The allowable values are given the following table:
Warning current 0.
13.4.10.
54/1 08
. This because the fault linked the voltages can persist
even with the circuit-breaker open and the unit would therefore always under "timing".2.9.4);
- with time that can specified set set after the circuit-breaker has closed;
- depending Vaux being installed.1. 14.9.9.
13.2 Protection “OV”
When the maximum phase voltage exceeds the set threshold the protection counts down the preset time interval and then opens.11 Protection against reverse active power “RP”
The PR123/DC unit provides protection (which can disabled) with adjustable fixed time k), against reverse active power, active both
with self-powering and auxiliary supply.
The operating logic involves the activation three contacts when the preset thresholds LC1, LC2 and Iware exceeded
