2.6.2. Connections
WARNING: Strict compliance with the instructions given in this document is required for the connections at the
user’s charge.
This will ensure compliance with all the international reference standards and guarantee that the protection
release functions perfectly even in heavy duty environmental and electromagnetic conditions. Pay particular
attention to the earth connection.
2.6.3. CS and TC connection check
WARNING: If the PR331/P has been installed by the user, remember to check (with the CB open and Vaux or
PR030/B), prior to putting the circuit-breaker into service, to make sure that the CS and TC cables have been
connected correctly. Make the correct connections if this is not the case. If all the red leds come on, it means
that there is an error in the CS and/or TC connections
2.6.4. Connection of current sensor for external neutral
WARNING: Remember to set the InN in the appropriate way if the current sensor for the external neutral conduc-
tor must be connected to a three-pole circuit-breaker.
During this phase, the circuit-breaker must be open and, if possible, isolated.
2.7. Default parameters
Before the PR331/P is put into service, it is essential for the user to define and carefully adjust the editable parameters to suit
his installation requirements.
ABB will apply the adhesive rating plates of all the variables concerning the CB (e.g. Type of CB, Rating Plug size, etc.) so as to
provide the user with all the information he needs to define the parameters.
PR331/P is supplied with the following predefined parameters:
# Protection Threshold Time
1 L 1 In 144 s
2 S Off 0,1 s
3 I 4 In --
4 G Off 0,1 s
5 Mains frequency 50 Hz
(1)
6 Neutral sel
(2)
7 S51/P1 Alarm L 0 s
Note:
(1) = 50 Hz for IEC type CB
60 Hz for UL type CB
(2) = Off for three-pole CB
50% for four-pole CB
B1751
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