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.5 unication bus
Local internal bus rear connector; RS485 physical interface, Modbus protocol.
Using this supply mode, only the unit's protection functions are assured, however, not the accessory functions regarding the modules.1.2. Protection against directional short-circuit with adjustabledelay "D";
4.5m A.
Test bus front test connector.... 98% with condensation
Degree protection (with PR123/P installed the CB) 30
14.2. +90°C
Relative humidity .6 Protection functions
The PR123/P protection unit carries out independent protection functions.
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 rre in
co ode kage rre (as fin IEC 478/1 and CEI 22/3) 3.3 Powered the PR120/V odule
For full explanation the features the PR120/V, see par.E3 E4.4 escription inputs/outputs
14.3 max 2In
MTBF (MIL-HDBK-217E) years 45°C
14.E6 E1.tric ris tic s
Rated operating frequency 50/60Hz ±10%
Pass band 3000Hz max
Peak factor 6.4.
The characteristics the power pack are given the table below:
C haracteristics Version PR123/P
Auxiliary voltage
(galvanically separated) 24V ±20%
Maximum ripple 5%
Inrush current 24V ~10A for 5ms
Rated power 24V ~5W
14.
77/158
.
14.1 elf-pow ering
Self-powering enables the protection unit powered with the busbar current using current transformers.2.4. 2
Page No.2 Binary outputs
- K51/SZout (K51/DFout): Zone selectivity: output for protection "direct" output for protection D
(only with Vaux)
- K51/GZout (K51/DBout): Zone selectivity: output for protection "reverse" output for protection D
(only with Vaux)
Note: These inputs/outputs can used between PR122/PR123 and PR332/PR333 series units only.2. Protection against earth fault with adjustable delay "G";
7..2.. Protection against overload with inverse time "L";
2.2.1 Binary inputs
- K51/SZin (K51/DFin): Zone selectivity: input for protection "direct" input for protection D
(only with Vaux)
- K51/Gzin (K51/DBin): Zone selectivity: input for protection "reverse" direction input for protection D
(only with Vaux)
14.2...N°.2.2...
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 MEASURING module, which powered means connection the busbars. Protection against closing short-circuit "MCR"
6.
14. Protection against instantaneous short-circuit "I";
5..E6
Minimum three-phase busbar current for enabling relay and switching the display >70A >140A >160A >320A
14. 15.2.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps. Protection against short-circuit with adjustable delay "S"and "S2";
3.3 Environm ental characteristics
Operating temperature -25°C .2.2.E3 E4. Protection against instantaneous short-circuit high currents inst";
Model 2234 Apparatus Scale
L 2778
Doc.
14... particular:
1.
The characteristics are given the table below:
General characteristics Relay Enabling Relay ctivation
E1.2 uxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack.. +70°C
Storage temperature -40°C
