Estun E21S, Руководство по установке

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Figure 7-2
Location of enclosure grounding terminal
Power terminal grounding
There is a PE pin on power terminal. This pin must ground well, and ground
resistance is no higher than 0.3ohm.
Cable shield layer grounding
If encoder cable has shield layer, both ends of the shield layer must ground well,
suppress external interference effectively, and enhance system reliability. Do not
pigtail the shield layer.
For cable shield layer grounding, if ground potentials of both ends are not equal, it
will result in current in shield layer. In such case, treat the ground and lower
potential difference.
7.3 Protective measures
7.3.1 Measures to ensure electromagnetic compatibility
E21S and its components are specially designed for industrial environment with
strong electromagnetic compatibility. But when install and operate, take possible
interference by the outside into account, and improve reliability and stability of the
system.
Common external interference sources

High inductive load, such as contactor and relay. Strong electromagnetic
interference will be generated at the cut-off moment;

Frequency converter, servo driver and motor will generate strong
electromagnetic interference.