General Product Philosophy
The ZETA6xxx was not designed originally for EMC compliance. Therefore, it will require specific measures to be
taken during installation. The ultimate responsibility for ensuring that the EMC requirements are met rests with the
systems builder.
It is important to remember that for specific installations, the full protection requirements of the EMC Directive
89/336/EEC need to be met before the system is put into service. This must be verified either by inspection or by
testing. The following EMC installation instructions are intended to assist in ensuring that the requirements of the
EMC directive are met. It may be necessary to take additional measures in certain circumstances and at specific
locations.
It should be stressed that although these recommendations are based on expertise acquired during tests carried out on
the ZETA6xxx, it is impossible for Compumotor to guarantee the compliance of any particular installation. This will
be strongly influenced by the physical and electrical details of the installation and the performance of other system
components. Nevertheless, it is important to follow all the installation instructions if an adequate level of compliance
is to be achieved.
Safety Considerations
The ZETA6xxx is intended for installation according to
the appropriate safety procedures including those laid
down by the local supply authority regulations. The
recommendations provided are based on the requirements
of the Low Voltage Directive and specifically on
EN60204. It should be remembered that safety must never
be compromised for the purpose of achieving EMC
compliance. Therefore in the event of a conflict occurring
between the safety regulations and the following
recommendations, the safety regulations always take
precedence.
Ferrite Absorbers and P-Clips
Ferrite Absorber Specifications
The absorbers described in these installation
recommendations are made from a low-grade ferrite
material which has high losses at radio frequencies. They
therefore act like a high impedance in this waveband.
The recommended components are produced by Parker
Chomerics (617-935-4850) and are suitable for use with
cable having an outside diameter up to 10-13mm. The
specification is as follows:
Chomerics part #
83-10-M248-1000
83-10-A637-1000
Outside diameter
17.5mm
28.5mm
Inside diameter
10.7mm
13.77mm
Length
28.5mm
28.57mm
Impedance at 25MHz
80
Ω
135
Ω
Impedance at 100MHz
120
Ω
210
Ω
Curie temperature
130°C
130°C
(the device should not be operated near this temperature)
Handling & Installing Ferrite Absorbers
Take care when handling the absorbers—they can shatter
if dropped on a hard surface. For this reason the suggested
method of installation is to use a short length of 19mm
diameter heat-shrink sleeving (see Figure 1). This gives a
degree of physical protection while the cable is being
installed. The sleeving should have a shrink ratio of at
least 2.5:1. Cable ties may be used as an alternative,
however they give no physical protection to the absorber.
Figure 1. Ferrite Sleeve Installation
P-Clip Installation Details
The function of the P-clip is to provide a 360-degree
metallic contact and thus a convenient means of ensuring a
proper R.F. ground. When dealing with EMI issues, it is
important to remember that continuity, a DC connection,
does not at all speak to the integrity of an AC (high-
frequency) connection. High-Frequency bonding typically
involves wide, flat cabling to establish a suitable system
Appendix D
E M C I n s t a l l a t i o n G u i d e l i n e s
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
