Yokogawa VJQ7 User Manual

User’s Manual
IM 77J01Q17-01E
Model VJQ7 Analog/Pulse Transmitter
For the correct use of this product, read through this manual before use. The following safety symbol is indicated on the product to en­sure safe use.
CAUTION
If this symbol is indicated on the product, the operator should refer to the explanation given in the instruction manual in order to avoid personnel injury or death to either themselves or other personnel, and/or damage to the instru­ment. The manual describes the special care the operator should exercise to avoid shock or other dangers that may re­sult in injury or loss of life.
The following symbol marks are used only in this manual.
IMPORTANT
Indicates that operating the hardware or software in a par­ticular manner may damage it or result in a system failure.
NOTE
Draws attention to information that is essential for under­standing the operations and/or features of the product.
4. MOUNTING METHODS
4.1 Wall Mounting
Loosen the main unit-fixing screw of the transmitter to disconnect the main unit from the socket. Next, anchor the socket onto the wall with screws. Then, plug the main unit into the socket and se­cure the main unit with the main unit-fixing screw.
Socket
Threaded hole for fixing the main unit
Main unit
Main unit-fixing screw
Fig. 4.1
4.1.1 Mounting Dimensions
29.5 or more 22±0.2
Unit: mm
2-M4 or 2-ø4.5 or more
Mounting screws
2. CHECKING PRODUCT SPECIFI­CATIONS AND THE CONTENTS OF PACKING
(1) Model Number and Specification Check
Check that the model number and specifications shown on the nameplate attached on the side of the product are as ordered.
(2) Contents of the Packing
Check that the packing contains the following items:
VJQ7 main unit, 1
Instruction Manual (IM 77J01Q17-01E), 1
Accessories:
Tag number label, 1
Renge label, 1
Shunt registor (for specification of current input), 1
3. GENERAL
The VJQ7 is a plug-in analog/pulse Transmitter that converts DC current or DC voltage signal into isolated transistor-contact pulse or contactless AC switch pulse. The VJQ7 converter features:
Either pulse output, communication function (RS-485), or
alarm output (2 relay contacts) is selectable as Output-2.
Keep this manual in a safe place.
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
59±0.3
Fig. 4.2
4.2 DIN Rail Mounting
Locate the transmitter so that the DIN rail fits into the upper part of the DIN-rail groove at the rear of the socket, and fasten the socket using the slide lock at the lower part of the socket.
DIN rail
VIEW A
Fig. 4.3
VIEW A (Rear of socket)
IM 77J01Q17-01E
1st Edition Feb. 2000
2nd Edition June 2004
DIN rail
Slide lock
2
NOTE
4.3 Mounting Using a Multi-mounting Base
For mounting using a multi-mounting base, see the Instruction Manual for VJCE (VJ Mounting Base).
4.4 Using Ducts
Wiring ducts should be installed at least 30 mm away from the top or bottom of the main unit.
4.5 I
n case of top-and-bottom close mounting
Transmitter should be mounted horizontally with its top and bot­tom slits being vertical. The top and bottom slits should not be covered. The area for wiring is required above and below the transmitter (the area with slant lines).
40 or more40 or more
ALM1
ALM1
ALM1
ALM2
ALM2
29.5 or more
ALM1
ALM1
ALM2
ALM2
(72)
(72)
(29.5)
78 or more
150 or more
ALM2
ALM1
ALM2
For mounting, use M3 screws and crimp-on terminals with in­sulating sleeves appropriate for the wires used. Tool of the crimp-on terminals to be used should be appropri­ate for the crimp-on terminals.
Mount a breaker on the external place. Mount a switch or 5A circuit breaker on the place near by the instrument, within operator’s reach. And attach the indication that it is for disconnecting the instrument.
Input signal
Analog input
+
1
R
-
3
R: 100 Externally connected for current input
Shunt resistor (Externally connected for current input)
3 2
1011
56
1 4
789
Output-2 signal
Pulse output
+
2
-
5
Output-1 signal
Pulse
output
+
7
-
9
Power supply
L+
10
N-
11
GND
8
Alarm output
ALM1
2
COM
5
ALM2
6
RS-485
communication
B+
2
A-
5
6
COM
Fig. 4.4
5. INSTALLATION LOCATION
For installation, avoid any location where the product may be subject to vibrations, corrosive gases, or large amounts of dust, or where the product is exposed to water, oil, solvents, direct sunlight, radioactive rays, or strong electric or magnetic fields.
If there is a possibility that lightning could induce a high surge voltage on the power and signal lines, provide lightning arrest­ers on the line between the field instrument and indoor instru­ment in order to protect the product. Install a dedicated ar­rester on the field side and another on the indoor side.
6. EXTERNAL WIRING
WARNING
Turn OFF the power supply and make sure that none of the cables are not in the hot-line state before carrying out the wiring to avoid the possibility of electric shock.
Wires are connected to the terminals of the isolator’s socket. M3 screw terminals are provided for the connection of external signals. Attach a crimp-on lug to each wire for connection to the terminals.
Recommended cables: A nominal cross-sectional area of 0.5 mm2 or thicker for signal cables, and that of 1.25 mm2 or thicker for power cables, and shielded twisted-pair cables (AWG24) for communication wiring cables.
Fig. 6.1
The use of inductance (L) loads such as auxiliary relays
and solenoid valves causes malfunction or relay failure; always insert a CR filter or diode for spark-removal into the line in parallel with the load. Recommended CR C: 0.5 to 1F against contact current 1A R: 0.5 to 1 against contact voltage 1V
Keep all sources of noise away from the power and sig-
nal cables. Otherwise, accuracy cannot be assured.
Provide grounding to a grounding resistance of 100 ⍀.
The length of the grounding cable should be 20 m or less. Directly connect the lead from the ground terminal (terminal no. 8) of the isolator to the ground. Do not carry out daisy-chained inter-ground terminal wiring.
Direct Current
“Overvoltage category (Installation category)” describes a
number which defines a transient overvoltage condition. It implies the regulation for impulse withstand voltage. “II” applies to electrical equipment which is supplied from the fixed installation like distribution board.
“Pollution degree” describes the degree to which a solid,
liquid, or gas which deteriorates dielectric strength or surface resistivity is adhering. “2” applies to normal in­door atmosphere. Normally, only non-conductive pollu­tion occurs. Occasionally, however, temporary conduc­tivity caused by condensation must be expected.
Rated fuse of 125VDC, 1A is stored. However, operators
can not replace the fuse.
All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01Q17-01E 3rd Edition Mar.31,1997-00
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