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1 Circuit-breaker state
The PR122/DC unit records the state the circuit-breaker means specific wiring the circuit-breaker.2.
- Current;
- Instantaneous current values over given tim interval (data logger).2. the case where the presence
of current determined with the circuit-breaker the "OPEN" state, state error signaled warning message being displayed (see par.6.12. +90°C
0% .
12.
- 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.
Model 3447
Apparatus Emax DC
Scale
D oc. enabled, the event undefined Rating Plug error Installation error, opening command
is given the being enabled..2. Protection against short-circuit with adjustable delay “S” ;
3.5mA.. Protection against overload with inverse time “L” ;
2.
31/108
.
The signal can combined with relay the PR120/K module with those the PR021/K unit. When the circuit-breaker opens, the page withthe"Trip" data displayed
(when Test" pressed, automatically the presence Vaux). 1SDH000635R0002
Page No.
□ Rating PLUG validity.2 Auxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack.
- The protection records the historical data the maximum current read. 98% with condensation
IP 30
. Protection against instantaneous short-circuit high currents "Iinst";
6.6) and the "warning" LED lighting up.2.
□ Watchdog for protection Trip. 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. Protection against overtemperature “OT”.4.
12.2..
12. Protezione override con rele non alimentato;
7. Protection against closing short-circuit “MCR”;
5.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps.
12.6 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.1.1 Powered the PR120/V-PR120/LV module
For full explanation the features the PR120/V-PR120/LV, see par
12.2.2.
12.4.4 Description inputs/outputs
12.3 Environmental characteristics
Operating temperature
Storage temperature
Relative humidity
Degree protection (with PR122/DC installed the CB)
12.2.
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.. +70°C
-40°C .
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..2.No. disabled when
the alarm condition ceases when the protection has been tripped.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.
□ Watchdog for proper connection the Trip Coil (TC). particular:
1..2.1 Binary inputs
- K51/SZin: Zone selectivity: input for protection (only with Vaux)
12. Protection against instantaneous short-circuit“I”;
4. 14.5 Communication bus
Local bus rear connector; RS485 physical interface, Modbus protocol.8 Watchdog
The PR122/DC unit provides some watchdog functions able guarantee the proper management relay malfunctions. These functions are as
follows:
□ Watchdog for presence Auxiliary power supply with "plug" icon displayed.
The display shows histograms with the currents the polarity the main page and numerical form.
12.
Test bus front test connector.2.
A timing indication (message "alarm" LED) provided the unit's display,which activated duringa protection alarm.
-25°C
