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7 Measurement functions
The current measuring (ammeter) function available all versions the SACE PR122/DC unit. +70°C
-40°C . Protection against instantaneous short-circuit high currents "Iinst";
6.4. enabled, the event undefined Rating Plug error Installation error, opening command
is given the being enabled.6) and the "warning" LED lighting up.
- Current;
- Instantaneous current values over given tim interval (data logger).2.
The signal can combined with relay the PR120/K module with those the PR021/K unit.
□ 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.
A timing indication (message "alarm" LED) provided the unit's display,which activated duringa protection alarm. These functions are as
follows:
□ Watchdog for presence Auxiliary power supply with "plug" icon displayed. particular:
1. 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. 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. Protection against overload with inverse time “L” ;
2.. When the circuit-breaker opens, the page withthe"Trip" data displayed
(when Test" pressed, automatically the presence Vaux).
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps. Protection against overtemperature “OT”.2 Auxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack..1 Binary inputs
- K51/SZin: Zone selectivity: input for protection (only with Vaux)
12.
The presence the auxiliary power supply enables the relay unit used even with the circuit-breaker open, well powering all the modules. 98% with condensation
IP 30
. +90°C
0% .
12.5mA.
□ Watchdog for proper connection the Trip Coil (TC).
Model 3447
Apparatus Emax DC
Scale
D oc.2. Protection against short-circuit with adjustable delay “S” ;
3.2.2.
- The protection records the historical data the maximum current read. 14. Protezione override con rele non alimentato;
7.
The display shows histograms with the currents the polarity the main page and numerical form.No.
12.2..4 Description inputs/outputs
12.1.12..
Test bus front test connector.
12.2.5 Communication bus
Local bus rear connector; RS485 physical interface, Modbus protocol.1 Circuit-breaker state
The PR122/DC unit records the state the circuit-breaker means specific wiring the circuit-breaker.8 Watchdog
The PR122/DC unit provides some watchdog functions able guarantee the proper management relay malfunctions.2. Protection against closing short-circuit “MCR”;
5.4.
□ Rating PLUG validity..1 Powered the PR120/V-PR120/LV module
For full explanation the features the PR120/V-PR120/LV, see par
12.2 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 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
12.2..3 Environmental characteristics
Operating temperature
Storage temperature
Relative humidity
Degree protection (with PR122/DC installed the CB)
12. 1SDH000635R0002
Page No.6 Protection functions
The PR122/DC protection unit carries out independent protection functions.2.6.
12.
-25°C .
12.2.
31/108
. disabled when
the alarm condition ceases when the protection has been tripped.
12.
- Maintenance: number operations, percentage contact wear, opening data storage (latest trips and events). Protection against instantaneous short-circuit“I”;
4
