L3447
Emax DC
74/108
L3728
Model
Scale
Page No.
Doc. No.
Apparatus
1SDH000635R0002
13.6.2 Electrical signals
K51/p1...p4
Programmable electrical signals if the PR120/K module or the PR021/K unit are installed and there is an auxiliary power supply.
K51/p1...p8
Programmable electrical signals if the PR021/K unit is installed and there is an auxiliary power supply.
Pressing the "i Test" key enables you to reset the activated contacts.
Signalling
Description
•The prealarm threshold has been exceeded; with current values in the range 0.9xI
1
< I < 1.05xI
1
;
•Presence, between two polarity, of unbalance above the value programmed for the "U" protection,
Warning
(yellow) led
with protection trip disabled;
•Contact wear greater than 80% (and less than 100%);
•WARNING Threshold I
w
exceeded;
•Circuit-breaker state error;
•Configuration error;
•Settings inconsistency.
Warning
Led (yellow 0.5Hz)
•WARNING threshold of relay’s internal temperature exceeded.
Warning
Led (yellow 2Hz)
•ALARM threshold of relay’s internal temperature exceeded.
• Presence of current values I >1.3 I1 (timing protection “L”)*;
• Timing in progress for protection function S;
• Timing in progress for protection function G;
Alarm
(red) led
• Timing in progress for the voltage (UV, OV) protection functions;
• Timing in progress for the reverse active power protection function (RP);
• Timing in the case of unbalance between the polarities (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.
13.6.3 Table of error and warning messages
All the messages which can be shown on the display relating to incorrect configurations, generic alarms or deriving from the protection functions
and linked to useful information are described below.
The following symbols in the warning signals have the following meanings:
= Warning signal / Protection in alarm mode, with no trip (trip=off)
= Protection in alarm mode, with trip at end of delay (trip=on)
= Information, no action, except for displaying by the relay.
Error message
Description
Notes
Contact wear
Alarm for contact wear
Contact wear = 100%
G (TRIP OFF)
Alarm for protection G
T Alarm
Alarm for protection T
Temperature outside range
T (TRIP OFF)
Alarm for protection T
U Alarm
Alarm for protection U
Protection U delay counting down
UV Alarm
Alarm for protection UV
OV Alarm
Alarm for protection OV
RP Alarm
Alarm for protection RP
Load LC1
Alarm for load control LC1
Load LC2
Alarm for load control LC2
IA Sensor
Alarm for IA polarity current sensor
Polarity IA sensor disconnected or faulty
IB Sensor
Alarm for IB polarity current sensor
Polarity IB sensor disconnected or faulty
TC disconnected
Trip Coil disconnected or faulty
Rating Plug
Rating Plug Error absent or faulty
Invalid date
Clock information lost
CB status
CB status error
Probable error in Q26 and/or Q27
Installation
Key plug error
CB not defined
State of circuit-breaker inconsistent (Open/Closed)
Probable error in Q26 and/or Q27
13.6 Definition of alarms and signals in the PR123/DC unit
13.6.1 Optical signals