GE MLJ, Manual

GEK - 105560

16

The codes for failures are:

0.0. No defects
8.0. ROM failure. The program memory has failed.
8.1. Writing failure to EEPROM
8.2. RAM program failure
0.1. Setting failure. The settings stored are incorrect. This error is also shown when the

EEPROM memory is new (in which case the settings are stored by default).

0.4. Measurement error (defect in the analog circuits).

If there are multiple failures, only the one with top priority is shown. The above is listed from most to
least important.

3.6 OUTPUT UNITS

The MLJ has 5 outputs which are relay contacts. The contacts can be configured as normally opened
(N.O.) or normally closed (N.C.), by means of internal jumpers (solded in the printed circuit board). The
contacts included are:

2 close enable contacts. Set in the factory as normally opened (N.O.) (non-configurable).
1 alarm contact. Set in the factory as normally closed (N.C.) (non-configurable).
1 auxiliary contact. Set in the factory as normally opened (N.O.) and configured in factory as function
25.
1 auxiliary contact. Set in the factory as normally opened (N.O.) and configured in factory as function
27.

3.6.1  Mode of Operation

Internally, the MLJ reads the signals sent from the following units: the synchronism and synchronism
failure signals supplied by the synchronism unit; the undervoltage, dead bus and line signals supplied
by the undervoltage unit; and, finally, the alarm signal given by the self-check unit.

If there is a synchronism or undervoltage signal, this unit will activate the Close enable relays.

If there is an Alarm signal, or if the power fails, the Alarm relay will be deactivated. For this reason this
contact is always configured as normally closed (N.C.) contact.

The auxiliary relays are activated depending on how they have previously been configured. The
configuration is individual for each of them, and is done by selection using the following menu:

− 

Close enable

(PEr)

− 

Synchronism

(25)

− 

Undervoltage

(27)

− 

Dead line

(

_

dL)

− 

Dead bus

(db

_

)

− 

Failure of closure conditions

(F25)

− 

Alarm

(ALA)

NOTE

: the message that appears on the screen is shown in parenthesis.

The selection of the outputs as normally opened (N.O.) or normally closed (N.C.) can be done
withdrawing the MLJ from its case and changing the jumpers to C for closed and A for opened,
respectively (a solder gun is required for this operation).

3.6.2 Settings

There are two settings, one for each of the auxiliary outputs:

5-1 

 1:

Configuration: first auxiliary output
Range: PEr, 25, 27, 

_

dL, db

_

, F25, ALA

Units: --