Red Lion PAXLC8 - Manual (Page 4)

4
3.0 W
IRING THE
M
ETER
The meter has switches that must be checked and/or changed prior to applying
power. To access the power switch, remove the meter base from the case by firmly
squeezing and pulling back on the side rear finger tabs. This should lower the latch
below the case slot (which is located just in front of the finger tabs). It is
recommended to release the latch on one side, then start the other side latch.
Power Selection Switch
Caution: Insure the AC power selection switch is set for the proper
voltage before powering-up the meter. The meter is shipped from
the factory in the 230 VAC position.
Setup DIP Switches
A DIP switch is at the rear of the meter. It is used
to set up the input, enable/disable programming and
front panel reset functions. For the correct input
setup, refer to 3.3 Wiring the Meter.
Switch 1
SNK.: Adds internal 7.8 K
 pull-up resistor to +12 VDC, I
MAX
= 1.9 mA
Switch 2
SRC: Adds internal 3.9 K
pull-down resistor, 8 mA max. @ 30 VDC max.
Switch 3
HI Frequency: Removes damping capacitor and allows max. frequency.
LO Frequency: Limits input frequency to 50 Hz and input pulse widths to
10 msec.
Switch 4
LOGIC: Input trigger levels V
IL
= 1.5 V max; V
IH
= 3.75 V max.
MAG: Not used for count applications.
Switch 5
Enable Programming: Enables programming through the front panel
buttons.
Disables Programming: Disables the front panel buttons from any
programming changes.
Switch 6
Enable Reset: Enables the front panel reset (down arrow key).
Disable Reset: Disables the front panel reset key. Note: The remote reset
terminal is not disabled by this switch.
2.0 S
ETTING THE
S
WITCHES
WIRING OVERVIEW
Electrical connections are made via screw-clamp terminals located on the
back of the meter. All conductors should conform to the meter’s voltage and
current ratings. All cabling should conform to appropriate standards of good
installation, local codes and regulations. It is recommended that the power
supplied to the meter (DC or AC) be protected by a fuse or circuit breaker.
When wiring the meter, compare the numbers embossed on the back of the
meter case against those shown in wiring drawings for proper wire position. Strip
the wire, leaving approximately 0.3" (7.5 mm) bare lead exposed (stranded wires
should be tinned with solder.) Insert the lead under the correct screw-clamp
terminal and tighten until the wire is secure. (Pull wire to verify tightness.)
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.
7. Switching of inductive loads produces high EMI. Use of snubbers across
inductive loads suppresses EMI.
Snubber: RLC# SNUB0000.
REAR TERMINALS
FRONT DISPLAY
115
INPUT SET-UP
DIP SWITCHES
230
POWER
SELECTION
SWITCH
3 1 2 5 4
ON
6
6 5 4 3 2 1
ON
DIS PGM DIS RST MAG LO Freq. SRC. SNK.
EN PGM EN RST LOGIC HI Freq. Not Active Not Active
Factory Setting