|Ask the Experts|
August 31, 2017
Control Electronic Static Discharge
How can I control Electronic Static Discharge in my automated handling equipment?
|Expert Panel Responses|
Contact the manufacturer of the equipment for this information
North America Sales Manager
In most cases, electrostatic discharge protection should be built into the equipment, it is difficult to retrofit, but I can give you some tips.
Director of Application Engineering
Inside of the AHE (automated handling equipment) you have ESD events, called from CDM (Charged Device Model). This ESD event is very fast. For ESD control you shell first all metal parts are grounding and second you shell use an ionizer. The ionizer shell is placed inside of the AHE. The ionizer shell discharge the electronic device and the PCB directly before the electronic device placed on the PCB. If you have more questions, we have a very long experience in static control, also inside of machines or outside on workstation.
All equipment should be grounded through the power cord. If any portion of the equipment is isolated from the chassis ground then electrical connections should between all the pieces or sections of the equipment so it is all grounded. It can be as simple as having a conductive floor and using chains to drag onto the floor, or using metal pads for the feet of the equipment on the grounded floor. One should also review the equipment for any element which may not be static dissipative allowing an electrical charge to build up, for example a place where paper is slid across a non metallic surface or a conveyor that is supported by non metallic supports or isolated from the base system. When these conditions are evident, wires can be installed to ground the units together.
Vice President, Technical Director
If you are referring to ESD events caused by the motion of the handling devices then the only method is to utilize localized ionization. The ionizer needs to be of the quality that will "knock down" a charge rapidly. There are several devices on the market that are capable of doing this that are made to go inside the cabinet without sacrificing a great deal of room. As far as the equipment itself, it is grounded via your electrical system.
As Leo has so wisely pointed out, do not assume that all portions of any machine are grounded through the power cord. Also do not assume that if you have 0 ohms of resistance between the various parts of the machine and electrical ground, there is nothing to worry about. The electrical ground may only be for some parts of the machine, but the rails, fixtures, etc., should also be checked for grounding. Also, a machine that is grounded can still produce voltages that can damage the circuit card or components that it comes in contact with. These have to be checked as well, similar to the testing performed on a solder station.
|Submit A Comment|
Free Newsletter Subscription
Circuitnet is built for professionals who bear the responsibility of looking ahead, imagining the future, and preparing for it.
Insert Your Email Address