Athena 6075 series, Instruction Manual, Page: 15 / 39

watchdog circuits and filtering built into the unit Contacts and coils must be
suppressed! One very effective filter is a .1 ufd/600V capacitor in series with a
100 Ohm, 1/2 watt (min.) resistor. This network must be put on all contacts,
especially across hard contacts that are switching coils and across the coils
themselves. The filter should be placed as close to the noise source as
Possible i.e. right on a contactors coil etc.
Other recommended practices include:
* Run sensor wires separately, shield if possible and ground only one end
of the shield.
* Install .01 ufd/100V or greater capacitors from each sensor terminal to
case ground (the green screw).
* Connect each unit’s ground (the green case screw) directly to the machine
(ground). Do not connect it to the panel Paint and corrosion can cause
poor signal transmission Do not connect ground wires in series from
unit to unit Ground wires must be connected from each unit directly
to ground
* Make sure the machine is connected to earth ground Do not assume
it is.
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