Protection Against Lightning Surge; Other Notes - Okura Yusoki A Series Original Instructions Manual

2.4. Protection Against Lightning Surge

There is no protection against lightning surge inside of controller.
Relevant protection against lightning shall be required when connecting main power
supply.
2.5. Other Notes (Wiring)
2.5.1. Attaching insulation cover
Attach cover to O-axis and D-axis connector, which keep more than 10 mm clearance and
creepage distance not to touch.
2.5.2. Securing of Grounding Continuity
1.
Connect following wires between robot body and protective conductors inside
controller.
Wires: IEC standard
Wires diameter: more than 10 sqmm
Color: green/yellow
2.
Measure resistance value between each motor frames and external protective
conductor of controller, and confirm if the value is less than following resistance
value.
Resistance value : 0.1 ohm or less per 10 A
3.
Attaching duct
Harness between controller and robot must be put in metal duct.
Divide power line and control line by separator.
Minimum size of duct is 150 mm wide and 100 mm deep.
4.
Fix protective conductor terminal with specified screw to the robot as shown in the
figure. And fix insulator separately.
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