L2234
Emax
40/158
Model
Scale
Page No.
Doc. No.
Apparatus
1SDH000460R0002
L2778
12.7 Definition of the alarms and signals for the PR121/P unit
12.7.1 Optical signals
The following table shows how the LEDs are managed in accordance with the IEC standard 60073 (and clause 4.2.3.2 in particular).
The LED alerts you to the status of the function set on its zone; e.g. in the figure in par. 12.5 the LED referenced as 1 identifies the status of the
function L. Also see the table below:
(1) Information on the "Last trip" is displayed when the LED relating to the protection unit that has been tripped comes on. The LED remains on
for 2 sec, or permanently if an outside power supply (from the PR030/B) is being used.
(2) The information is displayed with all the LEDs on for as long as the test button is pressed and held, or for 2 sec.
(3) When enabled, Hardware trip causes opening of the CB in 1 sec., activates in case of “Cs Error” or “Rating Plug Error”, or when Ne protection
is set to “ON” on the 3p CB without external neutral (configuration error).
When Vaux and/or PR030/B are installed (connected during the event), trip cause is displayed (CS Error, Rating Plug Error).
When no Vaux and/or PR030/B are installed, the general “Hw trip” indication is retained and can be viewed by pressing the “I-Test” key.
(4) Orange L led and red I led on.
(5) The values entered differ from those stored. Therefore, the relay must be installed (see 12.6.3).
(6) If other signals are not present, unit's operating mode is indicated 3 sec after the unit has been turned on.
TC error or TC disconnected
CS error or disconnected
Rating Plug/Install. error
Protection timing alarm
Last trip
(1)
Test button pressed and x
no failure detected
(2)
Hardware Trip
(3)
L prealarm
Configuration error
(5)
Settings inconsistency
Normal relay
operation
(6)
RED
Flashing
slowly
(0.5 Hz)
RED
RED
RED
ORANGE
RED
RED
ORANGE
Type of information
All LEDs
All LEDs
All LEDs
All LEDs
LED Single LED
LED flashing with
two 0.5 sec pulses
every 2 sec
ORANGE
Single LED
LED flashing
with one pulse
every 3 sec
ORANGE
(4)
LED
Flashing fast (2Hz)
LED on permanently
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