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2.4 escription inputs/outputs
-25°C .6 Protection functions
The PR122/P protection unit carries out independent protection functions.1.4.2.1 Binary inputs
- K51/SZin:
- K51/Gzin:
13.2.With the optional PR120/V module, the PR122/P also assures the following protections:
S bol Protection against
UV undervoltage
OV overvoltage
RV residual voltage
RP reverse active power
UF underfrequency
OF overfrequency
U phase-to-phase voltage unbalance (as alternative phase currents)
13.2. Protection against overload with inverse time "L";
2. 98% with condensation
IP 30
Zone selectivity: input for protection S
Zone selectivity: input for protection G
(only with Vaux)
(only with Vaux)
13.3 Powered the PR120/V odule
For full explanation the features the PR120/V, see par..4. 15.E6
Minimum three-phase busbar current for enabling relay and switching the display >70A >140A >160A >320A
50/60 ±10%
3000 max
6.2..3 Environm ental characteristics
Operating temperature
Storage temperature
Relative humidity
Degree protection (with PR122/P installed the CB)
13.5m A.
Since the xiliary voltage needs isolated from the "galvanically separated converters" accordance ith
/ the IEC standard 60950 (UL 1950) the equivalent IEC 60364-41 and CEI 64-8 have used guarantee rre in
L ode akage rre (as fin IEC 478/1 and CEI 22/3) 3.
Using this supply mode, the unit's protection functions are assured, however, not the accessory functions regarding the modules..
13.2....
The presence the auxiliary power supply enables the relay unit used even with the circuit-breaker open, well powering all the modules.1 lf-su ply
The self-supply enables the protection unit powered with the busbar current using current transformers.E3 E4.
13.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps.2.n°..
The characteristics the power pack are given the table below:
C haracteristics Version PR122/P
Auxiliary voltage
(galvanically separated) 24V ±20%
Maximum ripple 5%
Inrush current 24V ~10 for 5ms
Rated power 24V ~5W
13. Protection against short-circuit with adjustable delay "S";
Model 2234 Apparatus Scale
L 2778
Doc..2.
13.2 Binary outputs
- K51/SZout: Zone selectivity: output for protection (only with Vaux)
- K51/GZout: Zone selectivity: output for protection (only with Vaux)
Note: These inputs/outputs should used between PR122/PR123 and PR332/PR333 series units only.E3 E4.. particular:
1.
The characteristics are given the table below:
General characteristics Relay Enabling Display Switch-On
E1.2..2 Electrical characteristics
Rated operating frequency
Pass band
Peak factor
MTBF (MIL-HDBK-217E)
13.5 unication bus
Local bus rear connector; RS485 physical interface, Modbus protocol...E6 E1.3 max 2In
15 years 45°C
1 ilia ly
The external auxiliary power supply provided using galvanically-separated power pack.
Test bus front test connector.
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-40°C .2
