Conversion Of The Auxiliary Contacts Or Of The Signalling Contacts (Disconnected - Test Isolated - Connected) From Normally Closed (Opening) To Normally Open (Closing) Or Vice Versa - ABB Emax DC L3447 Installation And Service Instructions Manual

5.4 Conversion of the auxiliary contacts or of the signalling contacts (disconnected - test isolated - connected), from normally
closed (opening) to normally open (closing) or vice versa
The contacts are wired at the factory as shown on the electrical circuit diagram. If it is necessary to change their state for installation requirements,
proceed as follows.
a) Auxiliary contacts
To access the auxiliary contacts, carry out the following operations:
– remove the front protection (3) of the release by taking action on the blocks (1) as shown in the figure
– remove the protection release (4) removing the side nuts (2) and then sliding the release out from the front of the circuit-breaker.
1
3
Fig. 21
Being of the two-way type (changeover contacts), the auxiliary contacts can be modified from break contacts to make contacts and vice versa
simply by moving the output conductor from one position to the other, as shown in the figure.
N.C. contact Sliding contacts
Fig. 22
b ) Signalling contacts disconnected - test isolated -
connected
To change the state of the position contact, proceed in the same way
as explained for the auxiliary contacts.
L3447
Model
L3728
2
4
N.O. contact
Apparatus
Doc. No.
Terminal box
Emax DC
1SDH000635R0002
Scale
Page No.
13/108