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2. +90°C
0% .5mA. Protection against closing short-circuit “MCR”;
5.
□ Watchdog for proper connection the Trip Coil (TC). Protection against instantaneous short-circuit“I”;
4.1 Circuit-breaker state
The PR122/DC unit records the state the circuit-breaker means specific wiring the circuit-breaker. Protection against short-circuit with adjustable delay “S” ;
3.2.
-25°C .
- Current;
- Instantaneous current values over given tim interval (data logger)..
12.2.1.2.5 Communication bus
Local bus rear connector; RS485 physical interface, Modbus protocol.
Test bus front test connector. Protezione override con rele non alimentato;
7.8 Watchdog
The PR122/DC unit provides some watchdog functions able guarantee the proper management relay malfunctions.
A timing indication (message "alarm" LED) provided the unit's display,which activated duringa protection alarm.
12. Protection against instantaneous short-circuit high currents "Iinst";
6.
The presence the auxiliary power supply enables the relay unit used even with the circuit-breaker open, well powering all the modules.
□ Watchdog for protection Trip. +70°C
-40°C .12.
12. Protection against overload with inverse time “L” ;
2. Protection against overtemperature “OT”.
- The protection records the historical data the maximum current read. 1SDH000635R0002
Page No.2.2. particular:
1.1 Binary inputs
- K51/SZin: Zone selectivity: input for protection (only with Vaux)
12..
□ Rating PLUG validity. These functions are as
follows:
□ Watchdog for presence Auxiliary power supply with "plug" icon displayed.4.2.2.
12. enabled, the event undefined Rating Plug error Installation error, opening command
is given the being enabled. the case where the presence
of current determined with the circuit-breaker the "OPEN" state, state error signaled warning message being displayed (see par..6) and the "warning" LED lighting up. 14.
- Maintenance: number operations, percentage contact wear, opening data storage (latest trips and events). enabled, any faults are indicated special alarm message and the "alarm" LED
coming on; the PR120/D-M module installed, this activates the coil opening command (YO), thus opening the CB.
Model 3447
Apparatus Emax DC
Scale
D oc.4.
The display shows histograms with the currents the polarity the main page and numerical form.
12.
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
Z common mode leakage current (as defined IEC 478/1 and CEI 22/3) greater than 3. disabled when
the alarm condition ceases when the protection has been tripped.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps.2 Auxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack.2.
12.2.2.4 Description inputs/outputs
12.7 Measurement functions
The current measuring (ammeter) function available all versions the SACE PR122/DC unit.2 Binary outputs
- K51/SZout: Zone selectivity: output for protection (only with Vaux)
Note: These inputs/outputs should used between PR122/PR123 series units only.
The signal can combined with relay the PR120/K module with those the PR021/K unit.2.No..6.
The characteristics the power pack are given the table below:
Characteristics Version PR122/DC
Auxiliary voltage
(galvanically separated) 24V ±20%
Maximum ripple 5%
Inrush current 24V ~10 for 5ms
Rated power 24V ~5W
12.6 Protection functions
The PR122/DC protection unit carries out independent protection functions. When the circuit-breaker opens, the page withthe"Trip" data displayed
(when Test" pressed, automatically the presence Vaux)..3 Environmental characteristics
Operating temperature
Storage temperature
Relative humidity
Degree protection (with PR122/DC installed the CB)
12. 98% with condensation
IP 30
.
31/108
..1 Powered the PR120/V-PR120/LV module
For full explanation the features the PR120/V-PR120/LV, see par
12
