Solid State Relays

G3NH

201

Replacement

Be sure to turn off the power before replacement.

1. First, remove the four screws (shown below as “A”) and the

transparent protective cover from the relay housing and then

disconnect the wiring.

2. Remove the four screws (shown in the following as “B”) and the

nameplate from the relay housing.

3. Remove the three screws (shown in the following as “C”) from

inside the housing and pull the Base Assembly up to detach. (The

Base Assembly cannot be removed thoroughly because of the

leads connected to the base.)

4. When the Base Assembly is detached, you will see the leads

connected to the built-in thyristor module. Pull the connector to

disconnect the leads. At this point, if any defect exists in any of

the electronic components on the PWB, the SSR may fail again

even after the replacement of the built-in thyristor module. In such

a case, consult OMRON about appropriate remedial action.

5. Remove the two screws (shown in the following as “D”) and take

out the built-in thyristor module.

Assembly of the thyristor module must be performed in the exact

reverse order of the previous disassembly steps 1 to 5.

6. Before mounting the new thyristor module for replacement, wipe

off the silicone grease adhering to the heat sink, keep clean the

jointing surfaces of the heat sink and thyristor module, and apply

the new grease (supplied as an accessory) to the jointing

surfaces. Secure the thyristor module to the heat sink with the two

screws “D” and tighten each screw to a torque of 2.45 to

2.94 N·m.

7. Connect the thyristor module to the PWB with the socket. (The

socket may be inserted in either direction.) Assemble the Base

Assembly with the heat sink by aligning the PWB with the PWB

securing groove and the protective cover with the protective cover

securing groove, respectively, while exercising caution not to get

any of the leads caught between the Base Assembly and the heat

sink.

8. Secure the Base Assembly with the three screws “C”. Because a

large current flows into these screw parts, make sure that any of

the screws is not clogged with foreign matter and tighten each

screw to a torque of 4.41 to 4.90 N·m.

9. Check the assembled parts again for any lead caught between

the Base Assembly and heat sink and for proper fitting of the

PWB and protective cover into their respective securing grooves.

Then, replace the nameplate and secure it with the four screws

“B”.

10.Complete the wiring and secure the protective cover with the four

screws “A”.

11.Apply power to the relay and check the relay for proper operation.

A

A

A

A

B

B

B

B

Name plate

C

Base

Connector

Protection cover

PWB

Connecting to thyristor module

Protection cover

securing groove

D

D

PWB securing groove

Heat sink