Nordson Encore HD iControl System, Hardware Manual

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Installation
3-7
Part 1603054-02
E 2015 Nordson Corporation
Grounding
Proper grounding of all conductive components of a powder coating system
provides both shock and electrostatic discharge protection for both
operators and sensitive electronic equipment. Many system components
(booth, collector, color modules, control consoles, and conveyor) are
connected both physically and electrically. It is important that the proper
grounding methods and equipment are used when installing and operating
the system.
PE (Protective Earth) Grounding
PE grounding is required on all conductive metal electrical enclosures in a
system. PE grounding is provided by a ground conductor wire bonded to a
true earth ground. PE grounding protects operators from electrical shock by
providing a path to ground for electrical current if a conductor contacts an
electrical enclosure or other conductive component. The ground conductor
wire carries the electrical current directly to ground and short circuits the
input voltage until a fuse or circuit breaker interrupts the circuit.
The green/yellow ground wires bundled with the AC input power cable are
used only for PE grounding and their sole purpose is to protect personnel
from a shock. These ground wires do not protect against electrostatic
discharge.
Electrostatic Grounding
Electrostatic grounding protects electronic equipment from damage caused
by electrostatic discharges (ESD). Some electronic components are so
sensitive to ESD that a person can deliver a damaging static discharge
without feeling even a mild shock.
Proper electrostatic grounding is mandatory in an electrostatic powder
coating system. Powder spray guns generate electrostatic voltages up to
100,000 volts. It does not take long for ungrounded system components to
build up an electrical charge strong enough to damage sensitive electronic
components when discharged.
Electrostatic discharges occur at very high frequencies, around 100
megahertz. An ordinary ground conductor does not conduct such high
frequencies well enough to prevent damage to electronic components.
Special flat braided cables are provided with your Nordson powder coating
equipment to protect against ESD.
Obsolete