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The PR121/P unit allows the neutral pole's current signal beprocessed using different relationships with the value the phases. Ifthe sensors are disconnected there Rating Plug error, when activated, opening command
is issued due the being activated.
A timing indication ("alarm" LED) provided the front the unit, which enabled during alarm for each protection; disabled when the
alarm condition ceases when the protection has been tripped. 12. protection against short-circuit with adjustable delay "S";
3.
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.1 Calculating the RMS
All the protection functions their respective processing the basis the real rms value the currents (the protection disabled for current
values greater than 8In [where I4>0,8In], greater than 6In [where 0.1.:
1.2.
This function can accessed through PR10/T test unit only via test bus and through HMI030 via local bus.
12.
□ atchdog for proper opening solenoid connection (TC).
12..3@2In), the tolerance for the calculation the true rms value will increase.3 atchdog
The PR121/P unit provides some watchdog functions guarantee the proper management relay malfunctions.n°.2.2. protectionagainst earth fault with adjustable delay "G";
5.
12. These functions are follows:
□ Rating PLUG validity.
With auxiliary voltage, the protection records historical the maximum current read. This function can activated through PR010/T test unit.
-25°C .4 unication bus
Local bus rear connector; RS485 physical interface, Modbus protocol. Any anomalies are indicated the LED coming on, explained par. 12. Any anomalies are indicated the LED coming on, explained par.5In< I4<0. protectionagainst instantaneous short-circuit high currents "Iinst". 98% with condensation
IP 30
Model L2234 Apparatus Scale
L 2778
Doc. the circuit-breaker does not open immediately the first time the Trip Coil hit (partial failure),
TRIP commands are sent repeatedly until the circuit-breaker opens.
C ris tic 121/P
Auxiliary voltage
(galvanically separated) 24V ±20%
Maximum ripple 5%
Inrush current 24V ~10A for ms
Rated power 24V ~2W
1 iro ris tic s
Operating temperature
Storage temperature
Relative humidity
Degree protection (with PR121/P installed the circuit-breaker)
12.
N..
The characteristics the power pack are given the table below.1.
□ atchdog for proper current sensor connection (CS).5 Protection functions
The PR121/P unit provides independent protection functions, i.7..8In] and greater than 4In [where I4<0,5In]. +90°C
0% .
For the fixed-time protections with adjustable delay, the relationship adopted follows: k.2.5.5..2.5. +70°C
-40°C .
12. protectionagainst instantaneous short-circuit "I";
4. 2
Page No. protection against overload with inverse time "L";
2.
For the inverse-time protections, the relationship between trip time and overcurrent given the formula: /I2.2 easuring Function
A current measuring function (ammeter) available all versions the PR121/P unit.
Test bus front test connector.7.e.
The unit also has "backup protection" function.: Beyond 15..The presence the auxiliary power supply enables the relay unit used even with the circuit-breaker open.
If the waveform has deformation beyond the declared limit (6..
□ atchdog for protection against Trip.B.5xIn current the Ne, the protection considered being set 100%
