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12.3
Other functions
12.3.1 Indication of the cause of the trip and trip test button
Using the "i Test" button, you can retrieve the information stored in the past 48 hours. You can also perform a trip test by pressing and holding
the button for 7 seconds and an Autotest by pressing and holding the button for 3 seconds, again with the PR030/B battery unit connected and
no current flowing through.
12.4
Putting into service
12.4.1 Connections
For the connections provided by the user, it is recommended that you comply strictly with the recommendations contained
in this document.
This will enable us to satisfy all the international reference standards and guarantee the perfect operation of the relay even
under severe environmental and electromagnetic conditions. Take particular care with the earthing connections.
12.4.2 CS and TC connection check
If the PR121/P has been installed by the user, it is advisable (with the CB open and Vaux or the PR030/B) to check the proper
connection of the TC and/or CS cables before putting the circuit-breaker into service; if this has not been done,
make the right connections. If any of the red LEDs come on, this means an error in the connection of the CS
and/or TC. See par. 12.7.1.
1 2 . 4 . 3 Current sensor connection for external neutral
If you want to connect the current sensor for the external neutral conductor to a three-pole circuit-breaker,
remember to set I
During this procedure, the circuit-breaker must be open and preferably isolated.
12.5
User interface
Captions on the front of the PR121/P unit:
17
20
Ref.
Description
1
Alarm indicator LED for protection function L
2
Pre-alarm indicator LED for protection function L
3
Alarm indicator LED for protection function S
4
Alarm indicator LED for protection function I
5
Alarm indicator LED for protection function G
6
DIP switch for fine-setting of current threshold l1
7
DIP switch for the main setting of the current threshold l1
8
DIP switch for setting current threshold I2
9
DIP switch for setting current threshold I3
10
DIP switch for setting current threshold I4
11
DIP switch for setting trip time t1
12
DIP switch for setting trip time t2 and type of curve
L2234
Model
L2778
N accordingly (see par. 12.5, ref. 15)
n
18
9
19
11 12
7
6 8
1 2 3
5
4
13
10
Apparatus
Doc. No.
21
22
27
14
23
24
Emax
1SDH000460R0002
25
16
15
26
Scale
Page No.
37/158
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Table of Contents
Troubleshooting
