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14.
13. Protection against instantaneous short-circuit “I”;
4.
13..6 Protection functions
The PR123/DC protection unit carries out independent protection functions. the case where the presence
of current determined with the circuit-breaker the "OPEN" state, state error signaled warning message being displayed (see par.2.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps.
A timing indication (message "alarm" LED) provided the unit's display, which activated during protection alarm. Override protection when release not powered.4.4.5mA. disabled when
the alarm condition ceases when the protection has been tripped..
13. Protection against undervoltage “UV”;
10.2 Binary outputs
- K51/SZout (K51/DFout): Zone selectivity: output for protection (only with Vaux)
- K51/GZout (K51/DBout): Zone selectivity: output for protection (only with Vaux)
Note: These inputs/outputs can used between PR122/PR123 series units only.6) and the "warning" LED lighting up.
The signal can combined with relay the PR120/K module with those the PR021/K unit. Protection against overvoltage "OV";
11.
A
Since the auxiliary voltage needs isolated from the ground, "galvanically separated converters" accordance with
the IEC standard 60950 (UL 1950) the equivalent IEC 60364-41 and CEI 64-8 have used guarantee current in
common mode leakage current (as defined IEC 478/1 and CEI 22/3) greater than 3.2 Auxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack.
13. When the circuit-breaker opens, the page with the "Trip" data displayed
(when Test" pressed, automatically the presence Vaux).2.3 Environmental characteristics
Operating temperature -25°C .6.
13.1 Binary inputs
- K51/SZin (K51/DFin): Zone selectivity: input for protection (only with Vaux)
- K51/Gzin (K51/DBin): Zone selectivity: input for protection (only with Vaux)
13.
Test bus front test connector. +70°C
Storage temperature -40°C .5 Communication bus
Local internal bus rear connector; RS485 physical interface, Modbus protocol.2. particular:
1.2.
Model 3447
A pparatus Emax DC
S cale
D 1SDH000635R0002
Page No. Protection against phase unbalance “U” ;
8.2.13.4 Description inputs/outputs
13.1 Powered the PR120/V-PR120/LV module
For full explanation the features the PR120/V-PR120/LV, see par. Protection against reverse active power "RP";
12...1 Circuit-breaker state
The PR123/DC unit records the state the circuit-breaker means specific wiring the circuit-breaker.2.
50/1 08
.1.2. Protection against overtemperature "OT";
9...2. Protection against earth fault with adjustable delay “G”;
6. +90°C
Relative humidity . Protection against closing short-circuit “MCR”
5.
The characteristics the power pack are given the table below:
Characteristics Version PR123/DC
Auxiliary voltage
(galvanically separated) 24V ±20%
Maximum ripple 5%
Inrush current 24V ~10A for 5ms
Rated power 24V ~5W
13.
The presence the auxiliary power supply enables the relay unit used even with the circuit-breaker open, well powering all the modules,
with the exception the PR120/V-PR120/LV MEASURING module, which powered means connection the busbars.2. Protection against overload with inverse time “L”;
2.2. Protection against instantaneous short-circuit high currents inst";
7. Protection against short-circuit with adjustable delay “S” and "S2";
3. 98% with condensation
Degree protection (with PR123/DC installed the CB) 30
13
