Yamaha SRCD Series Supporting Supplement Manual page 25

2-2-4 Protective bonding
The robot controller is built in to the equipment, so it has a protective structure of Class
I against electrical shock. To prevent electrical shock, be sure to ground the protective
conductor terminal of the robot controller by connecting it to the protective conductor of
the entire system. The protective conductor terminal of the robot controller is marked
with the symbol shown below.
2-2-5 Insulation co-ordination
Insulation co-ordination was designed to meet the following conditions. (Refer to the
description of IEC60664-1 standards.)
I Overvoltage category II
I Pollution degree II
If the robot or controller is used in environments worse than these levels, take proper
countermeasures as needed.
2-2-6 Isolation Resistance and Voltage BreakdownTests
Never attempt isolation resistance tests or voltage breakdown tests on the controller.
Since capacitive grounding is provided between the controller body and 0V, these tests
may result in detecting excessive leakage current or damage to internal circuitry. If these
tests are required, please consult your YAMAHA sales office or representative.
Protective conductor terminal symbol : 417-IEC-5019
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CHAPTER2 Configuration and Connection