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□ Watchdog for proper connection the Trip Coil (TC).
□ Rating PLUG validity.2.8 Watchdog
The PR122/DC unit provides some watchdog functions able guarantee the proper management relay malfunctions.
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.
The signal can combined with relay the PR120/K module with those the PR021/K unit. 14.
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.
12.
A timing indication (message "alarm" LED) provided the unit's display,which activated duringa protection alarm.2. Protection against closing short-circuit “MCR”;
5..6 Protection functions
The PR122/DC protection unit carries out independent protection functions.
31/108
. Protection against overtemperature “OT”.2.
12.
12..12.1 Binary inputs
- K51/SZin: Zone selectivity: input for protection (only with Vaux)
12.2. disabled when
the alarm condition ceases when the protection has been tripped.
- The protection records the historical data the maximum current read.
Model 3447
Apparatus Emax DC
Scale
D oc..4.
12.5mA. Protezione override con rele non alimentato;
7.2. 1SDH000635R0002
Page No.5 Communication bus
Local bus rear connector; RS485 physical interface, Modbus protocol.1..1 Powered the PR120/V-PR120/LV module
For full explanation the features the PR120/V-PR120/LV, see par
12.. +70°C
-40°C .
- Current;
- Instantaneous current values over given tim interval (data logger). When the circuit-breaker opens, the page withthe"Trip" data displayed
(when Test" pressed, automatically the presence Vaux). These functions are as
follows:
□ Watchdog for presence Auxiliary power supply with "plug" icon displayed.No.2.
The display shows histograms with the currents the polarity the main page and numerical form.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.2.7 Measurement functions
The current measuring (ammeter) function available all versions the SACE PR122/DC unit.2.
- Maintenance: number operations, percentage contact wear, opening data storage (latest trips and events).
The presence the auxiliary power supply enables the relay unit used even with the circuit-breaker open, well powering all the modules. the case where the presence
of current determined with the circuit-breaker the "OPEN" state, state error signaled warning message being displayed (see par.2.1 Circuit-breaker state
The PR122/DC unit records the state the circuit-breaker means specific wiring the circuit-breaker.2.4 Description inputs/outputs
12. Protection against short-circuit with adjustable delay “S” ;
3.
□ Watchdog for protection Trip. +90°C
0% . particular:
1.
12.
-25°C . Protection against overload with inverse time “L” ;
2. Protection against instantaneous short-circuit high currents "Iinst";
6. 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. enabled, the event undefined Rating Plug error Installation error, opening command
is given the being enabled.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps.4. Protection against instantaneous short-circuit“I”;
4.2.
Test bus front test connector. 98% with condensation
IP 30
.6) and the "warning" LED lighting up..6.2.
12.3 Environmental characteristics
Operating temperature
Storage temperature
Relative humidity
Degree protection (with PR122/DC installed the CB)
12.2 Auxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack
