5
EMC INSTALLATION GUIDELINES
Although this meter is designed with a high degree of immunity to Electro-
Magnetic Interference (EMI), proper installation and wiring methods must be
followed to ensure compatibility in each application. The type of the electrical
noise, source or coupling method into the meter may be different for various
installations. The meter becomes more immune to EMI with fewer I/O
connections. Cable length, routing, and shield termination are very important
and can mean the difference between a successful or troublesome installation.
Listed below are some EMC guidelines for successful installation in an
industrial environment.
1. The meter should be mounted in a metal enclosure, which is properly
connected to protective earth.
2. Use shielded (screened) cables for all Signal and Control inputs. The shield
(screen) pigtail connection should be made as short as possible. The
connection point for the shield depends somewhat upon the application.
Listed below are the recommended methods of connecting the shield, in order
of their effectiveness.
a. Connect the shield only at the panel where the unit is mounted to earth
ground (protective earth).
b. Connect the shield to earth ground at both ends of the cable, usually when
the noise source frequency is above 1 MHz.
c. Connect the shield to common of the meter and leave the other end of the
shield unconnected and insulated from earth ground.
3. Never run Signal or Control cables in the same conduit or raceway with AC
power lines, conductors feeding motors, solenoids, SCR controls, and
heaters, etc. The cables should be run in metal conduit that is properly
grounded. This is especially useful in applications where cable runs are long
and portable two-way radios are used in close proximity or if the installation
is near a commercial radio transmitter.
4. Signal or Control cables within an enclosure should be routed as far as possible
from contactors, control relays, transformers, and other noisy components.
5. In extremely high EMI environments, the use of external EMI suppression
devices, such as ferrite suppression cores, is effective. Install them on Signal
and Control cables as close to the unit as possible. Loop the cable through the
core several times or use multiple cores on each cable for additional protection.
Install line filters on the power input cable to the unit to suppress power line
interference. Install them near the power entry point of the enclosure. The
following EMI suppression devices (or equivalent) are recommended:
Ferrite Suppression Cores for signal and control cables:
Fair-Rite # 0443167251 (RLC# FCOR0000)
TDK # ZCAT3035-1330A
Steward # 28B2029-0A0
Line Filters for input power cables:
Schaffner # FN610-1/07 (RLC# LFIL0000)
Schaffner # FN670-1.8/07
Corcom # 1 VR3
Note: Reference manufacturer’s instructions when installing a line filter.
6. Long cable runs are more susceptible to EMI pickup than short cable runs.
Therefore, keep cable runs as short as possible.
3.0 R
EVIEWING THE
F
RONT
B
UTTONS AND
D
ISPLAY
Display Valley (LO) Reading
Display Peak (HI) Reading
PAR
PROGRAMMING MODE OPERATION
DISPLAY MODE OPERATION
KEY
Store selected parameter and index to next parameter
Increment value or change selection
Decrement value or change selection
Access Programming Mode or Display Input Reading
PEAK/VALLEY DETECTION
The meter will automatically record the highest input reading (peak) and the
lowest input reading (valley) for later recall. These values are stored at power-
down to allow monitoring the process limits over any length of time (shifts, days,
etc.). A selectable capture delay time is used to prevent detection of false peak or
valley readings caused by sudden short spikes or unusual process events.
The peak and valley readings can be viewed and reset using the front panel
keys as described below.
View Peak, Valley and Input readings:
To view Peak, press
. Meter displays
followed by the Peak reading.
To view Valley, press
. Meter displays
followed by the Valley reading.
To view Input, press
PAR
. Meter displays
followed by the current
Input reading.
Note: The decimal point to the right of digit 1 flashes while the peak or valley
reading is displayed.
Reset Peak and/or Valley to the current Input reading:
To reset Peak and Valley, press
and
simultaneously.
To reset Peak only, press and hold
then press
PAR
.
To reset Valley only, press and hold
then press
PAR
.
In each case, the meter displays
followed by the current Input reading.
