3.7.4. Controller and Grounding

3.7.4. Controller and Grounding

 

Connect the grounding conductor to the controller for safety.

Use the grounding conductor more than 5.5㎟. (Class 3 grounding)

 

l  Hi5a-P10/P20

 

Connect the grounding conductor to the controller for safety. A dedicated ground wire is required to comply with explosion-prevention regulations. Connections must be surely checked because an incomplete connection or a connection not made may cause explosions or fires.

 

When wiring inside the controller is performed, two types of ground wire connection are required. For general grounding, 100 Ω or less should be applied in the connection. For circuits related to intrinsic safety, 1 Ω or less resistance with the ground should be applied in the connection. Normally, a green/yellow pattern cable is used for general grounding, while a light blue cable is used for intrinsically safe grounding.

 

For the manipulator and the controller, a grounding wire of UL1015 AWG 10 (5.5 SQ) or above should be used, and for intrinsically safe grounds, a grounding wire of 12 AWG (4 SQ) or above should be used for the connection to the ground terminal, as shown below.

 

The intrinsically safe connection cable should be kept at least 50 mm distant from other cable connections.

 

Figure 3.39 Wiring inside the controller