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2. Protection against instantaneous short-circuit high currents inst";
7.13.2..
50/1 08
.4 Description inputs/outputs
13. Protection against undervoltage “UV”;
10.6. 14. +70°C
Storage temperature -40°C . Protection against overtemperature "OT";
9.4.
13.6 Protection functions
The PR123/DC protection unit carries out independent protection functions. Protection against overvoltage "OV";
11.3 Environmental characteristics
Operating temperature -25°C . particular:
1. When the circuit-breaker opens, the page with the "Trip" data displayed
(when Test" pressed, automatically the presence Vaux).
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.
Test bus front test connector.
13. the case where the presence
of current determined with the circuit-breaker the "OPEN" state, state error signaled warning message being displayed (see par.1 Circuit-breaker state
The PR123/DC unit records the state the circuit-breaker means specific wiring the circuit-breaker.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps.
13.2. Protection against overload with inverse time “L”;
2. Protection against earth fault with adjustable delay “G”;
6.
A timing indication (message "alarm" LED) provided the unit's display, which activated during protection alarm.5mA.2.
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.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..2.5 Communication bus
Local internal bus rear connector; RS485 physical interface, Modbus protocol.
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 3.2.6) and the "warning" LED lighting up.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.
13. Protection against short-circuit with adjustable delay “S” and "S2";
3. Override protection when release not powered..2 Auxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack..
The signal can combined with relay the PR120/K module with those the PR021/K unit. Protection against reverse active power "RP";
12.
Model 3447
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Page No. Protection against phase unbalance “U” ;
8.2..
13. Protection against closing short-circuit “MCR”
5.2.2.. Protection against instantaneous short-circuit “I”;
4. 98% with condensation
Degree protection (with PR123/DC installed the CB) 30
13.4.1 Powered the PR120/V-PR120/LV module
For full explanation the features the PR120/V-PR120/LV, see par.1.2. +90°C
Relative humidity . disabled when
the alarm condition ceases when the protection has been tripped
