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DIR 1000587R0002 (Version 02)
2.3. User
interface
LSIG 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 trip unit
2
Test connector to connect battery unit
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 confi guration of rated frequency and neutral protection
8
Rating Plug
9
“iTest” button
2.3.1. Dip
switches
The dip switches on the front of LSIG 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 trip unit is on and without alarms: updating is immediate and the unit need
not be restarted.
ATTENTION: Settings changed by the user when the trip unit is in the alarm condition will not be activated 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.
