Removing the STO contactors

In order to access the SICK modules and replace them, the two STO contactors must first be disconnected and removed.

1. Disconnect all the wires going into the two STO contactors. Both STO contactors have three rows of inputs–top, middle and bottom. All of the terminals can be loosened on the front of the STO contactors. Use a T25 bit.

   

2. Remove the end clip on the DIN rail to the left of the STO contactors. Use a small flat-head bit if necessary.

   

3. Push downwards on the release mechanism below the STO contactors with a screwdriver. This enables you to remove it from the DIN rail.

   

4. While pushing the release mechanism downwards, push the STO contactor toward the front of the drawer and up to detach it from the DIN rail.

   

5. Repeat steps 3 and 4 with the second STO contactor.

Replacing the SICK modules

The SICK modules are stacked together on a DIN rail, connected by pins between them. It is important that a module is disconnected from its neighboring module before removing it from the DIN rail. The modules can be slid along the DIN rail to the left until there is room to remove it.

1. Unplug any cables in the module that you want to remove. The SICK modules can have cables connected on the underside too.

   

2. Slide all modules in front of the module you want to replace to the left along the DIN rail, and isolate the module you are replacing. Make sure it is not connected to any neighboring modules.

   

3. Remove the SICK module from the DIN rail by pulling it up, toward the front of the drawer, and down. The clip on the back of the SICK module releases when you pull the module up, enabling the module to be removed. Discard the removed module.

   

4. Place the bottom part of the new SICK module on the DIN rail, and then push the top part of the module backwards until it clips in place.

   

5. Slide the module into place along with any other modules that was slid out. Make sure all the modules are firmly pushed together and connected.

Reassembly

Remount all components by following the instructions in reverse.

All cables are clearly marked with labels to indicate where they should be connected. Observe the numbers printed on the STO contactors and SICK modules, and make sure that they correspond to the number on the wires.

Some wires are loose jumper wires, which will be marked in both ends.

Before remounting the K2 STO contactor, remember to route the following jumper cables through the channel on the right:

• The cable for connecting K1_21 to K2_22

• The cable for connecting K2_21 to XTIO1_I4

The two jumper cables are marked at the ends with the above connection points.