Ametek IPS-4-UV, User Manual

Page: 12 / 200

xii | IPS-4-UV Analyzer-GPDiv2
Electromagnetic Compatibility (EMC)
Read and follow the recommendations in this section to avoid performance
variations or damage to the internal circuits of this equipment when installed
in harsh electrical environments.
The various configurations of the IPS-4 Analyzer should not produce, or fall vic-
tim to, electromagnetic disturbances as specified in the European Union’s EMC
Directive (if applicable to your application). Strict compliance to the EMC Direc-
tive requires that certain installation techniques and wiring practices are used to
prevent or minimize erratic behavior of the Analyzer or its electronic neighbors.
Below are examples of the techniques and wiring practices to be followed.
In meeting the EMC requirements, the various analyzer configurations described
in this manual rely heavily on the use of metallic shielded cables used to con-
nect to the customer’s equipment and power. Foil and braid shielded I/O and DC
power cables are recommended for use in otherwise unprotected situations. In
addition, hard conduit, flexible conduit, and armor around non-shielded wir-
ing also provides excellent control of radio frequency disturbances. However,
use of these shielding techniques is effective only when the shielding element is
connected to the equipment chassis/earth ground at both ends of the cable run.
This may cause ground loop problems in some cases. These should be treated
on a case-by-case basis. Disconnecting one shield ground may not provide suf-
ficient protection depending on the electronic environment. Connecting one
shield ground via a 0.1 microfarad ceramic capacitor is a technique allowing
high frequency shield bonding while avoiding the AC-ground metal connection.
In the case of shielded cables the drain wire or braid connection must be kept
short. A minimal connection distance between the shield’s end and the nearest
grounded chassis point, ground bar or terminal is highly recommended. An even
greater degree of shield performance can be achieved by using metallic glands for
shielded cable entry into metal enclosures. Expose enough of the braid/foil/drain
where it passes through the gland so that the shield materials can be wrapped
backwards onto the cable jacket and captured inside the gland, and tightened up
against the metal interior.
Inductive loads connected to the low voltage “Alarm Contacts” are not recom-
mended. However, if this becomes a necessity, adhere to proper techniques and
wiring practices. Install an appropriate transient voltage suppression device (low
voltage MOV, “Transzorb,” or R/C) as close as possible to the inductive device to
reduce the generation of transients. Do not run this type of signal wiring along
with other I/O or DC in the same shielded cable. Inductive load wiring must be
separated from other circuits in conduit by using an additional cable shield on the
offending cable.
In general, for optimum protection against high frequency transients and other
disturbances, do not allow installation of this Analyzer where its unshielded I/O
and DC circuits are physically mixed with AC mains or any other circuit that
could induce transients into the Analyzer or the overall system. Examples of elec-
trical events and devices known for the generation of harmful electromagnetic
disturbances include motors, capacitor bank switching, storm related transients,
RF welding equipment, static, and walkie-talkies.
!
CAUTION