Specifications

L2234
L2778
L4681
L5179
Emax
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Doc. no.
Model
Apparatus
Scale
Page No
1SDH000460R0002
L5439
Access to view the opening data is via the Historicals submenu in the Measurements menu. The following is an example of the
information provided:
1/3
Last Trip
15 Feb 2004
I1: 625A
I2: 617A
N: > 10.0 kA
L Protection
N.02
I3: 623A
Number of openings due to the protections.
Indication for protection tripped.
Value of the currents interrupted on phases (L1, L2, L3), neutral (Ne) and Ground (if G has
been tripped).
Again in the Measurements menu, you can view the percentage of contact wear, which is an indication of the electrical life of the
electrical contacts in the circuit-breaker.
In any case, functionality of the relay is in no way modified by the presence of the wear messages.
The prealarm message (wear > 80%, “warning” LED lighting up) indicates that the wear has reached a high value. The alarm
message (100% wear, “alarm” LED lighting up) indicates that it is necessary to check the state of contact wear.
The percentage of wear depends on the number of openings carried out by the circuit-breaker and by the absolute current inter-
rupted during each of them.
13.6. Definition of alarms and signals in the PR122/P unit
13.6.1. Optical signals
Signaling Description
Led Warning (yellow)
• The prealarm threshold has been exceeded; one or more phases with current values in the range
0.9xI1< I < 1.05xI1 (on the Ne it depends on the selection made; for instance, at 50% the values
are halved).
• Presence, between two or three phases, of unbalance above the value programmed for the "U",
protection, with protection trip disabled;
• Presence of distorted wave form with form factor > 2.1;
• ontact wear greater than 80% (and less than 100%);
• WARNING Threshold Iw exceeded;
• Circuit-breaker state error;
• Frequency out of range;
• Configuration error;
• Settings inconsistency.
Led Warning (yellow 0,5Hz) • Relay’s internal temperature exceeding WARNING threshold.
Led Warning (yellow 2Hz) • Relay’s internal temperature exceeding ALARM threshold.
Led Alarm (red)
• Presence of overload on one or more phases with current values I >1.3 I1 (timing protection “L”)
(on the Ne it depends on the selection made; for instance, at 200% the values are doubled)*;
• Timing in progress for protection function S;
• Timing in progress for protection function I;
• Timing in progress for protection function G;
• Timing in progress for protection function D;
• Timing in progress for the voltage (UV, OV, RV), frequency (OF, UF) protection functions;
• Timing in progress for the reverse active power protection function (RP);
• Timing in the case of unbalance between the phases (protection U) above the value set in the
configuration with protection trip set to on;
• Contact wear = 100%;
• Rating Plug disconnected;
• Trip Coil (TC) disconnected;
• Key plug error;
• Current sensors disconnected;
• Installation error.
* The IEC 60947-2 Standard defines the timing threshold L for current: 1.05 < I < 1.3 I1..
13.6.2. Electrical signals
K51/p1...p4 Programmable electrical signals if the PR120/K module is installed and there is an auxiliary power supply.
K51/p1...p8 Programmable electric signals if the PR021/K unit is installed and there is an auxiliary power supply.
Pressing the “i Test” key enables resetting the activated contacts.