
3.0INSTALLING PLUG-IN CARDS
The
Range Jumpers
Setpoint Card
Comms Card
Locking Tab
CAUTION: The
REMOVING THE REAR COVER
To remove the rear cover, locate the cover locking tab below the 2nd and 3rd input terminals. To release the tab, insert a small, flat blade screwdriver between the tab and the plastic wall below the terminals. Inserting the screwdriver will provide enough pressure to release the tab locks. To replace the cover, align the cover with the input terminals and press down until the cover snaps into place.
4.0WIRING THE METER
Electrical connections are made via
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
Although this meter is designed with a high degree of immunity to ElectroMagnetic 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 ran in metal conduit that is properly grounded. This is especially useful in applications where cable runs are long and portable
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:TDK #
Line Filters for input power cables: Schaffner #
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.
DC Power
+9 to +28 VDC: +VDCPower Common:CAUTION: 9 to 28 VDC power circuit is not isolated from the signal circuit.
Sinking Logic
USR COMM | Connect external switching device between the |
USR | }User Input terminal and User Input Common. |
The user input of the meter is internally pulled up to +9 to +28 V with 10 K resistance. The input is active when it is pulled low (<0 .7 V).
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