Estun E21 User Manual

E21 Installation Manual
34
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
E21 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.
Ways to interfere coupling
Ways to interfere coupling are shown in Table 7-1.
Table 7-1 Ways to interfere coupling
Coupling mode
Cause
Typical cases
Direct electric
coupling
Two or more circuits use one
guide line
Many equipment share one power supply;
Electrostatic discharge, etc.
Capacity
coupling
Capacity coupling will
generate between any two
conductors.
When cables are laid in parallel, especially
when strong and weal current are in
parallel, strong current will affect weak
current.

Estun E21 Specifications

General

Brand	Estun
Model	E21
Category	Controller
Language	English