Rockwell Automation 140G-NTK-E12 LSIG and LSIG-MM Release User Manual

Page 10

DIR 1000587R0002 (L3821)

(10)

In some installations, where particularly high harmonics occur, the current running on neutral may be higher than that of phases.

In the LSIG release, this protection can be set for the following values: I

N =0 - 50% - 100% - 200% * I

With three-pole circuit breakers, without external neutral, Neutral is adjusted to OFF

2.5.2 Guidance for Neutral adjustment
Adjustment of neutral value (I

N) must comply with the following formula: I

x I

N≤Iu

When a 4-pole CB is available, this setting is controlled by the relay which signals the fault through a LED (see par. 2.6.1), and automatically

adjusts the parameter within the accepted limits.

When a 3-pole CB with external neutral is available, the relay does not perform any control and settings are to be adjusted by user.

E.g.:

With 140G-N 1200 with Rating Plug at 400 A, Iu=1200 A and I1=1In, adjustment of I

N may be 50-100-200%

With 140G-N 1200 and 800 A Rating Plug, Iu=1200 A and I1=1In, adjustment of I

N may be 50-100%

Note 1: I

=1l

setting is intended as the maximum adjustment of the protection against overloads. Actual maximum allowable adjustment must take into account any tempe-

rature derating, terminals used and altitude, or In (rating plug)≤ 50% of circuit breaker size.

Failure to comply with the setting limits for “I1“ and “I

N” can cause damage to circuit breaker with consequent risks even for

operator.

2.5.3 Replacing an electronic release
To complete the procedure for installing LSIG, take the following steps:

1. With the circuit breaker open and preferably isolated, install the protection unit on the circuit breaker.
2. Power the unit ONLY from the battery unit.
3. If there are no errors other than configuration error (see par. 2.6.1), press and hold “i Test” button for a few seconds until all red LEDs

start flashing confirming that installation is completed.

4. Remove the battery unit.
5. Power the relay from any supply (Vaux, battery unit).
6. Make sure there are no configuration errors (“Alive” LED glows).
7. Circuit breaker and release can now be commissioned.

2.6 Definition of alarms and signals for the LSIG unit

2.6.1 Optical signals
The following table shows how the LEDs are managed in accordance with IEC 60073 standard (clause 4.2.3.2 in particular).

The LED alerts about status of the function set on its zone; e.g. in the figure in par. 2.5 the LED referenced as 8 identifies status of function L.

Also see the following table

LED permanently ON

TC error or TC disconnected

CS error or disconnected

Rating Plug/Installation error

(1)

Protection timer error

Last trip

(2)

Test button pressed and

no failure detected

(3)

L pre-alarm

Configuration error

(4)

Settings inconsistency

Normal operation of relay

(5)

CB Undefined or

CB status error

RED

Flashing

slowly (0.5 Hz)

RED

ORANGE

RED

ORANGE

Type of information

All LEDs

Single LED

Flashing fast (2Hz)

LED flashing with

two 0.5 sec pulses

every 2 sec



ORANGE

Single LED

LED flashing with

one pulse

every 3 sec

ORANGE



Single LED

LED permanently ON



Single LED

ORANGE



(1) RP disconnected or RP>Iu

(2) 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 battery unit) is being used.

(3) The information is displayed with all LEDs on for as long as the test button is pressed and held, or for 2 sec.

(4) Installed values differ from stored values. Therefore, the relay must be installed (see 2.5.3).

(5) If other signals aren’t present, the unit’s operating mode is indicated 3 sec after the unit has been turned on.

This manual is related to the following products:

140G-NTT-E12 LSIG and LSIG-MM Release