Installation
3-15
Part 1618871−01
2020 Nordson Corporation
Grounding
WARNING: Consoles and all conductive equipment in the spray area
MUST be connected to a true earth ground. Use the provided ground
cables to ground the consoles. Mount junction boxes and control panels to
grounded stands or the booth base. Failure to observe this caution could
result in severe shocks to personnel, fire, or explosion.
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 sole purpose of the green/yellow ground wires bundled with the AC
input power cable is to protect personnel from a shock. They must be used
for PE grounding only. These ground wires do not protect equipment
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 V. 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 MHz.
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 Nordson powder coating equipment to protect
against ESD.
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