Yokogawa JUXTA VJR6 - Manual (Page 2)

2 IM 77J01R06-01E 2nd Edition June 01,2004-00
5. INSTALLATION LOCATIONS
● Avoid the following environments for installation locations:
Areas with vibration, corrosive gases, dust, water, oil, solvents, di-
rect sunlight, radiation, a strong electric field, and/or a strong
magnetic field
● If there is any risk of a surge being induced into the power line
and/or signal lines due to lightning or other factors, a dedicated
lightning arrester should be used as protection for both this unit
and a field-installed device.
6. EXTERNAL WIRING
WARNING
To avoid the risk of an electric shock, turn off the power
supply and use a tester or similar device to ensure that no
power is supplied to a cable to be connected, before carring
out wiring work.
Wiring should be connected to the terminals on the socket of the prod-
uct. The terminals for external connections are of M3 screws. Use
crimp-on terminal lugs for connections to the terminals.
● Recommended cables: A nominal cross-sectional area of 0.5 mm 2
or thicker for signal cables, and that of 1.25 mm 2 or thicker for
power cables.
10 11
3 2 1
4 5 6
7 8 9
1
3
4
11 10 8
L+ N– GND
7
9
B
B
A
+
–
2
5
+
–
Power Supply
Output-1
Output-2
Input
IMPORTANT
● The power line and input/output signal lines should be
installed away from noise-generating sources. Other
wise accuracy cannot be guaranteed.
● The grounding resistance must be 100
Ω
(JIS Class D
grounding). The length and thickness of the grounding
cable should be as short and thick as possible. Directly
connect the lead from the ground terminal (terminal no.
8) of the product to the ground. Do not carry out daisy-
chained inter-ground terminal wiring.
● Use of the product ignoring the specifications may
cause overheating or damage. Before turning on the
power, ensure the following:
(a) Power supply voltage and input signal value applied
to the product should meet the required
specifications.
(b) The external wiring to the terminals and wiring to
ground are as specifications.
● Do not operate the product in the presence of
flammable or explosive gases or vapors. To do so is
highly dangerous.
● The product is sensitive to static electricity; exercise
care in operating it. Before you operate the product,
touch a nearby metal part to discharge static electricity.
7. MAINTENANCE
The product starts running immediately when the power is turned on;
however, it needs 10 to 15 minutes of warm-up before it meets the
specified performance.
7.1 Calibration Apparatus
● A 6-dial variable resistor (Yokogawa M&C 279301 or the equivalent)
● A digital mutimater (Yokogawa 7561 or the equivalent)
● A precision resistor of 250 ⍀ ±
0.01%, 1 W
7.2 Calibration Procedure
(1) Connect the instruments as shown below.
(2) Find the resistance equivalent to 0, 25, 50, 75, and 100% of the
measuring range.
(3) Use the 6-dial variable resistance and apply input signals equiva-
lent to 0, 25, 50, 75, and 100% of the input span to the converter.
(4) Check to see the corresponding output voltages are 0, 25, 50, 75,
and 100% respectively and within the specified accuracy rating.
“R” is used for current output.
● If the output signals are out of the accuracy rating range, adjust
the output signal level using the zero and span adjustment vol-
umes on front face of the product.
10 11
6
7 8 9
3 2 1
4 5 1
4
3
11 10 8
L ϩ N Ϫ GND
2
5
7
9
R
A
B
B
R
R: 250 ⍀ precision resistor
for current output
Power supply
Output-2
Input
Output-1
Ϫ
ϩ
Digital
multimater
Ϫ
ϩ
Digital
multimater
6-dial variable
resistor