LJ Relays (Converting Contacts)

CONVERTING CONTACTS

These instructions assist the user in converting any or all of the contacts located in the upper deck of the relay. Be sure to read each instruction fully before beginning the work outlined in that step.

Projection mount units:

If you have and LJ32 or LJ33, proceed to step 4 under flush mount case below. If you have an LJ41, LJ42, LJ43, follow the flush mount case instructions below, shipping step 4.

Flush Mount Case

Using a 1/16" Allen wrench, remove and retain the two button head (4-40 x 1/4") nameplate retaining screws. (labeled N in figure 1)
Remove and retain the nameplate.
Observing the assembly order, remove and set aside target reset and target.
Remove the four(4) screws located at the corners of the case. These are on the terminal strip end of the case. Remove the relay from the case (note: On units with the seal-in option, you must first unscrew the collar from around the reset button.)
Noting the orientation of the cover, use a 1/4" standard screwdriver to remove the two(2) screws (labeled C in figure 1) which hold the cover in place. Remove cover.
Noting the location of the target magnet (labeled T in figure 1), use a 1/4" screwdriver to back out the red cross bar screw about one inch. Now rotate the red cross bar 90 degrees to provide access to the selected contact.
Locate the contact you wish to convert and remove the terminated leads from the terminals of the selected contact (refer to Figure 2). (note: On units with the electrical seal-in, you must first remove screw B (Figure 1, ) which holds the reset button in place. Move this assembly out of the way.)
Lift the contact cartridge out of its location. Turn the cartridge over and rotate the two cylindrical nuts (refer to Figure 2) to the required position (inserting the terminal screws a turn or two helps to facilitate this) in order to reassemble. Insert the cartridge back into its position. Verify the desired contact form by noting the N.C. or N.O. symbol on the contact. The symbol that is visible (facing upward) is the selected configuration.
Reassemble the relay in the exact reverse order stated above. Using a screwdriver, hand tighten all screws securely When assembly is complete no further adjustments are necessary, however testing the relay is recommended to assure its proper operation.

Lower Decks: Removal and conversion of contacts
Should the user wish to convert any of the contacts in the remaining decks (A and/or B), follow the direction below:

Follow steps one through six (6) above for the type of mounting configuration you have.
Back out the screw in the center of the red operator completely (Figure 3, )and set both screw and red operator aside.
Carefully remove the eight (8) terminated leads from the four (4) contacts in the uppermost deck (note: be sure to write down which sets of leads go to which contact).
Remove the two (2) deck mounting screws in Figure 3. These screws are long and hold the different decks together.
The deck is now ready to be removed As you remove the deck note its orientation, the bottom of each deck is keyed to assist in assembly As you lift the deck, the black cross bar (Figure 3.) for that deck will fall out of its center.
Set the deck with its corresponding black crossbar aside.
You may now convert the contacts as listed in steps 7-9 of converting contacts.
Reassemble in the reverse order listed above. Take particular care when rewiring the relay to insure that all pairs of leads match up and go to the properly configured contact. If there is any question as to the proper wiring pattern, refer to Figure 5. [note: All decks are labeled near the contact wells as Axx, Bxx, or Cxx. When assembling make sure you assemble A first, then B, then, if it is a 10 contact relay, C deck. (refer to Figure 1)]

Typical Terminal Blocks

Contacts are between 1 and 2, 3 and 4, etc.
Highest numbered terminals are wired to normally open contacts.
Contacts 21-22 / 13-14 are not available for use on an electrical seal-in unit.
Coil is wired between terminals labeled "C" and is not polarity sensitive.

Contact Relay Associates for more information.