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2.0 S ETTING
THE
DIP S WITCHES
To access the switches, remove the right side plate of the meter. A bank of eight
switches is located inside the unit. Note: Some switches are not used and should
remain in the factory set position.
Warning : Exposed line voltage exists on the circuit boards.
Remove all power to the meter and load circuits before accessing
inside of the meter.
SWITCH 1 (Unused)
This switch is not used and should remain in the factory set position.
SWITCH 2 (Input A) {See Note 1}
SNK : Adds internal 7.8 K ? pull-up resistor to +12 VDC, I MAX = 2.1 mA.
SRC : Adds internal 3.9 K ? pull-down resistor, 7.2 mA max. @ 28 VDC max.
SWITCH 3 (Input A)
FILTER ON : Provides hardware debounce for Input A to allow relay or
switch contacts to be used as a signal source. Software debounce for Inputs
A and B is provided in the programming menu (Module 1).
SWITCH 6 (RESET/USER INPUT) {See Note 1}
SNK : Adds internal 7.8 K ? pull-up resistor to +12VDC, I MAX = 2.1 mA.
SRC : Adds internal 3.9 K ? pull-down resistor, 7.2 mA max. @ 28 VDC max.
SWITCH 7 (Unused)
This switch is not used and should remain in the factory set position.
SWITCH 8 (Input B)
NORMAL : Input B performs the normal functions described in the Timer
Input Operation parameter of the programming menu (Module 1).
INTENSITY ADJUST : In this position, Input B is used to adjust the LED
display intensity. Five distinct LED levels can be set by pulsing Input B.
The display intensity level can also be set in the programming menu
(Module 3).
Note 1: When the DIP switch is in the SNK position (OFF), the input is
configured as active low. When the switch is in the SRC position (ON), the
input is configured as active high.
SWITCH 4 (Input B) {See Note 1}
SNK : Adds internal 7.8 K ? pull-up resistor to +12 VDC, I MAX = 2.1 mA.
SRC : Adds internal 3.9 K ? pull-down resistor, 7.2 mA max. @ 28 VDC max.
SWITCH 5 (Input B)
FILTER ON : Provides hardware debounce for Input B to allow relay or
Input A
Input B
UNUSED
SNK
FILTER OFF
SNK
FILTER OFF
1
2
3
4
5
SRC
ON
SRC
ON
switch contacts to be used as a signal source. Software debounce for Inputs
A and B is provided in the programming menu (Module 1).
Reset/User Input SNK
UNUSED
6
7
SRC
Input B Normal
8
ON
Intensity Adjust
Factory Setting
3.0 W IRING
THE
M ETER
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 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 ran 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.
3
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.
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