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3.0 W IRING
THE
M ETER
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 power supplied
to the meter (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, its source or the method of coupling into the unit may be different for
various installations. 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. 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.
3. Signal or Control cables within an enclosure should be routed as far away as
possible from contactors, control relays, transformers, and other noisy
components.
4. 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 #1VR3
Note: Reference manufacturer ’s instructions when installing a line filter.
5. Long cable runs are more susceptible to EMI pickup than short cable runs.
Therefore, keep cable runs as short as possible.
6. Switching of inductive loads produces high EMI. Use of snubbers across
inductive loads suppresses EMI.
Snubber: RLC#SNUB0000.
3.1 POWER WIRING
AC Power
Terminal 1: VAC
3.2 INPUT SIGNAL WIRING
Current Signal (self powered)
Terminal 4: + Amps AC
Terminal 2: VAC
1
2
Terminal 3: - Amps AC
3
4
115/230
-
A
+
5A MAX.
4.0 S CALING
THE
M ETER
FACTORY SCALING
The meter is calibrated from the factory for 5 Amps AC current input to show
1999. This scaling will be used when the Scale Switch is in the “OFF” position.
5
SCALING READOUT
Place the Scale Switch in the “ON” position. This enables the Scale
Potentiometer which is accessible from the back of the meter. (Enabling the
Scale Potentiometer does NOT affect the calibration of the meter.) Place the
Decimal Point Switches to the proper location. Apply the meter power and the
current signal. Adjust the Scale Potentiometer to the desired value.
This scaling only effects the span. There is no offset scaling. This means that
only zero current can display a value of zero.
At 5 Amps AC current input, the display can be scaled from 1999 down to
200 by using the scaling potentiometer. For display values below 200, turn on
the appropriate Decimal Point Switch and then adjust the potentiometer to
achieve the desired display value. Example: A customer wants to display 50
Amps because he is using a 50:5 CT. In this case, he must turn DIP switch 1 on
for a decimal point and DIP switch 5 on for scaling. Then apply the 5 Amp
signal and turn the scaling pot until 50.0 is shown on the display.
发布紧急采购，3分钟左右您将得到回复。
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