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Protection against instantaneous short-circuit high currents inst";
7.2 Auxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack.2.2.
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.
A timing indication (message "alarm" LED) provided the unit's display, which activated during protection alarm. disabled when
the alarm condition ceases when the protection has been tripped. Protection against earth fault with adjustable delay “G”;
6.
13.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps. Protection against closing short-circuit “MCR”
5..
50/1 08
.
The signal can combined with relay the PR120/K module with those the PR021/K unit.1 Powered the PR120/V-PR120/LV module
For full explanation the features the PR120/V-PR120/LV, see par.
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.
13. Protection against reverse active power "RP";
12.
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..2.2 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.2.5mA.
Test bus front test connector. Protection against overtemperature "OT";
9. When the circuit-breaker opens, the page with the "Trip" data displayed
(when Test" pressed, automatically the presence Vaux).1 Circuit-breaker state
The PR123/DC unit records the state the circuit-breaker means specific wiring the circuit-breaker.4. Override protection when release not powered. Protection against overload with inverse time “L”;
2.2. +90°C
Relative humidity .
Model 3447
A pparatus Emax DC
S cale
D 1SDH000635R0002
Page No. 98% with condensation
Degree protection (with PR123/DC installed the CB) 30
13. Protection against overvoltage "OV";
11. particular:
1.
13.
13. +70°C
Storage temperature -40°C .3 Environmental characteristics
Operating temperature -25°C .6.
13.5 Communication bus
Local internal bus rear connector; RS485 physical interface, Modbus protocol.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. 14.. Protection against undervoltage “UV”;
10.6) and the "warning" LED lighting up.6 Protection functions
The PR123/DC protection unit carries out independent protection functions.2. Protection against instantaneous short-circuit “I”;
4.4 Description inputs/outputs
13. Protection against short-circuit with adjustable delay “S” and "S2";
3.2.13.. Protection against phase unbalance “U” ;
8.2.1.. the case where the presence
of current determined with the circuit-breaker the "OPEN" state, state error signaled warning message being displayed (see par.4..2.2
