Yokogawa VJA4 User Manual
User’s
Manual
Model VJA4
Distributor (Non-isolated)
IM 77J01A04-01E
Please read through this User’s Manual before use for correct handling.
Please keep this User’s Manual for future reference.
IM 77J01A04-01E
1st Edition Jan. 2000 (MC)
2nd Edition June 2004 (YK)
Network Solutions Business Divisiion
2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan
Phone: +81-422-52-7179 Facsimile: +81-422-52-6793
1. CAUTIONARY NOTES FOR SAFE USE OF THE PRODUCT
This User’s Manual should be carefully read before installing and operating the product. The following symbol is used on the product and in
this manual to ensure safe use.
This symbol is displayed on the product when it is
necessary to refer to the User’s Manual for information on
personnel and instrument safety. This symbol is displayed
in the User’s Manual to indicate precautions for avoiding
danger to the operator, such as an electric shock.
The following symbols are used only in this manual.
4.1 Wall Mounting
Loosen the main unit-fixing screw of the product and pull out the main
unit from the socket. Fix the socket on the wall with screws. Next, insert the main unit into the socket and fasten the main unit with the main
unit-fixing screw.
IMPORTANT
Indicates that operating the hardware or software in a
particular manner may cause damage or result in a system
failure.
<Mounting Dimensions>
NOTE
Draws attention to essential information for understanding
the operations and/or functions of the product.
Main unit
29.5 or more
22±0.2
59±0.3
Mounting
screws
Main
unit-fixing
screw
Socket
Threaded hole for
fixing the main unit
2-M4 or 2-ø4.5 or more
Unit: mm
2.
CHECKING PRODUCT SPECIFICATIONS AND PACKAGED ITEMS
(1) Checking the Model and Product Specifications
Check that the model and specifications indicated on the nameplate
attached to the side face of the main unit are as ordered.
4.2 DIN Rail Mounting
Insert a DIN rail into the upper part of the DIN rail groove on the rear of
the socket, and then slide the slide lock at the lower part of the socket
upwards until the socket is fixed into position as shown below.
(2) Packaged Items
Check that the packing carton contains the following items:
● VJA4: 1
● Tag number label: 1 sheet
● User’s Manual (this manual: IM 77J01A04-01E): 1 copy
DIN rail
3. GENERAL
This plug-in type distributor is used in combination with a two-wire type
transmitter to convert the transmitter’s 4 to 20 mA DC signals into DC
current or DC voltage signals. The input/output signal is non-isolated.
4. MOUNTING METHOD
NOTE
Insert/pull out the main unit into/from the socket vertically
to the face of socket. Otherwise the terminals are bent and
it may cause a bad contact.
4.3 Mounting Using a Multi-mounting Base
When using a multi-mounting base, see the User’s Manual for VJCE
(VJCE Mounting Base).
4.4 Using a Duct
When using a wiring duct, install the duct at leaset 30 mm away from
the top and bottom faces of the main unit.
Fit into here
DIN rail
Push
(Rear of the socket)
DIN rail
Slide lock
5. INSTALLATION LOCATIONS
● Avoid the following environments for installation locations:
Areas with vibration, corrosive gases, dust, water, oil, solvents, direct 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 product. 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
or thicker for signal cables, and that of 1.25 mm2 or thicker for
power cables.
Output for Channel 2
When internal
power is used
PS
4
6
Input for Channel 2
COM
PS
1
3
Input for Channel 1
COM
When external
power is used
COM
COM
4
6
55
1
3
99
Example of using a
Zener barrier to
configure an
intrinsically safe
system
PS
COM
PS
COM
4
6
5
1
3
9
2
5
3 2
1
56
4
789
1011
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 DC voltage/current standard (Yokogawa 7651 or the equivalent)
● A digital multimater (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. First adjust the chan-
nel-1 signal and then the channel-2 signal.
(2) Use the DC voltage/current standard and apply input signals
equivalent to 0, 25, 50, 75, and 100% of the input span to the
product. 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 volumes on front face of the product.
3 2
Input
2
With SINK current
DC voltge/
current
standard
1
3
Without SINK current
DC voltge/
current
standard
3
4
Power supply
1
5
6
4
Output-2
L
1011
1110 8
N
2
5
789
7
9
R: 250 precision resistor
for current output
GND
R
Output-1
R
Digital
multimater
Digital
multimater
Power supply
1110 8
N
L
GND
Output for Channel 1
7
9
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 daisychained 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.
2
IM 77J01A04-01E 2nd Edition June 01,2004-00
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