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Protection against instantaneous short-circuit“I”;
4..
The signal can combined with relay the PR120/K module with those the PR021/K unit. These functions are as
follows:
□ Watchdog for presence Auxiliary power supply with "plug" icon displayed.5mA. +70°C
-40°C .2.4 Description inputs/outputs
12.
- Maintenance: number operations, percentage contact wear, opening data storage (latest trips and events)..
-25°C . When the circuit-breaker opens, the page withthe"Trip" data displayed
(when Test" pressed, automatically the presence Vaux).2.2 Auxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack.
□ Watchdog for proper connection the Trip Coil (TC).4.2.No.2.2.
The presence the auxiliary power supply enables the relay unit used even with the circuit-breaker open, well powering all the modules.
- The protection records the historical data the maximum current read. disabled when
the alarm condition ceases when the protection has been tripped.
- Current;
- Instantaneous current values over given tim interval (data logger).
The display shows histograms with the currents the polarity the main page and numerical form.6) and the "warning" LED lighting up.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. Protezione override con rele non alimentato;
7.
31/108
.
Test bus front test connector. Protection against overload with inverse time “L” ;
2.
12.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps.4. 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. 14.12. particular:
1.2.2.
A timing indication (message "alarm" LED) provided the unit's display,which activated duringa protection alarm. +90°C
0% .
□ Watchdog for protection Trip. the case where the presence
of current determined with the circuit-breaker the "OPEN" state, state error signaled warning message being displayed (see par.3 Environmental characteristics
Operating temperature
Storage temperature
Relative humidity
Degree protection (with PR122/DC installed the CB)
12.2..1. enabled, the event undefined Rating Plug error Installation error, opening command
is given the being enabled.
12.
12.1 Binary inputs
- K51/SZin: Zone selectivity: input for protection (only with Vaux)
12. 1SDH000635R0002
Page No.6 Protection functions
The PR122/DC protection unit carries out independent protection functions.7 Measurement functions
The current measuring (ammeter) function available all versions the SACE PR122/DC unit. Protection against overtemperature “OT”.
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..5 Communication bus
Local bus rear connector; RS485 physical interface, Modbus protocol.
12. Protection against closing short-circuit “MCR”;
5.
Model 3447
Apparatus Emax DC
Scale
D oc.1 Circuit-breaker state
The PR122/DC unit records the state the circuit-breaker means specific wiring the circuit-breaker.
12. Protection against instantaneous short-circuit high currents "Iinst";
6.8 Watchdog
The PR122/DC unit provides some watchdog functions able guarantee the proper management relay malfunctions.
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. Protection against short-circuit with adjustable delay “S” ;
3..2. 98% with condensation
IP 30
.2.2.2.6.
12..1 Powered the PR120/V-PR120/LV module
For full explanation the features the PR120/V-PR120/LV, see par
12.
□ Rating PLUG validity
