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.5mA.5 Communication bus
Local bus rear connector; RS485 physical interface, Modbus protocol.2. disabled when
the alarm condition ceases when the protection has been tripped. Protection against closing short-circuit “MCR”;
5.6.
- Maintenance: number operations, percentage contact wear, opening data storage (latest trips and events)..
□ Watchdog for protection Trip.
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.
- The protection records the historical data the maximum current read.
12.
Test bus front test connector.7 Measurement functions
The current measuring (ammeter) function available all versions the SACE PR122/DC unit.6 Protection functions
The PR122/DC protection unit carries out independent protection functions.1. particular:
1..4 Description inputs/outputs
12.6) and the "warning" LED lighting up.
-25°C . Protection against instantaneous short-circuit“I”;
4.
12...
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 overtemperature “OT”.2. +70°C
-40°C .
Model 3447
Apparatus Emax DC
Scale
D oc.2..No.2.2. 1SDH000635R0002
Page No. 14.
12.3 Environmental characteristics
Operating temperature
Storage temperature
Relative humidity
Degree protection (with PR122/DC installed the CB)
12.
The display shows histograms with the currents the polarity the main page and numerical form. +90°C
0% .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. enabled, the event undefined Rating Plug error Installation error, opening command
is given the being enabled.2 Auxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack.2.
12.2.
- Current;
- Instantaneous current values over given tim interval (data logger).12.8 Watchdog
The PR122/DC unit provides some watchdog functions able guarantee the proper management relay malfunctions. Protection against short-circuit with adjustable delay “S” ;
3.
The signal can combined with relay the PR120/K module with those the PR021/K unit.1 Circuit-breaker state
The PR122/DC unit records the state the circuit-breaker means specific wiring the circuit-breaker. Protection against instantaneous short-circuit high currents "Iinst";
6.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps.
□ Rating PLUG validity.
□ Watchdog for proper connection the Trip Coil (TC).2.. Protezione override con rele non alimentato;
7.
12.
The presence the auxiliary power supply enables the relay unit used even with the circuit-breaker open, well powering all the modules. Protection against overload with inverse time “L” ;
2.4. 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.2.1 Binary inputs
- K51/SZin: Zone selectivity: input for protection (only with Vaux)
12.1 Powered the PR120/V-PR120/LV module
For full explanation the features the PR120/V-PR120/LV, see par
12.
12. the case where the presence
of current determined with the circuit-breaker the "OPEN" state, state error signaled warning message being displayed (see par. These functions are as
follows:
□ Watchdog for presence Auxiliary power supply with "plug" icon displayed. When the circuit-breaker opens, the page withthe"Trip" data displayed
(when Test" pressed, automatically the presence Vaux). 98% with condensation
IP 30
.2.
A timing indication (message "alarm" LED) provided the unit's display,which activated duringa protection alarm.2
