2.3. User interface
PR331/P allows the protections and main settings to be adjusted via the dip switches and has signalling leds for monitoring the
state and alarms.
1
2
3
4
5 6
7 8 9
Ref. Description
1 Serial number of the protection release
2
Test connector
3 Section dedicated to protection L: threshold setting dip switches, time adjustment dip switches and alarm/trip leds
4
Section dedicated to protection S: threshold setting dip switches, time adjustment dip switches and alarm/trip leds
5
Section dedicated to protection I: threshold setting dip switches and trip leds
6
Section dedicated to protection G: threshold setting dip switches, time adjustment dip switches and alarm/trip leds
7 Dip Switches and indications for configuration of rated frequency and neutral protection
8 Rating Plug
9 “i Test” button
IMPORTANT: the dip switches and leds of protection S are available with release versions LSI and LSIG. The dip switches
and leds of protection G are available with release version LSIG.
2.3.1. Dip switches
The dip switches on the front of PR331/P are used for adjusting the tripping thresholds of each protection and the tripping time.
The available combinations are given alongside each group of dip switches.
The dip switches for regulating the tripping times of protections S (t2) and G (t4) can also be used for selecting the tripping curve:
Fixed time tripping curve. The following relation is used: t=k.
Inverse time tripping curve. The relation between the tripping time and over-current is given by the formula: t=k/I
2
The dip switch settings can be changed when the protection release is on and without alarms: updating is immediate and the
unit need not be restarted.
WARNING: Settings changed by the user when the protection release is in the alarm condition will not be acti-
vated until the alarm condition terminates.
An example of the dip-switch setting for the protection L function, with 2000A Rating Plug (In= 2000A) is given below.
B1751
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