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
4.1Wall Mounting
Loosen the main unit-fixing screw of the computing unit 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
4.1.1Mounting Dimensions
29.5 or more
22±0.2
t: 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:
● VJX7 main unit, 1
● Instruction Manual (IM 77J01X07-01E), 1
Accessories:
● Tag number label, 1
● Renge label, 1
● Shunt registor (for specification of current input), 1
3. GENERAL
This Universal Computing Unit, which belongs to the JUXTA series
of signal conditioners, receives DC current or voltage signals and
converts them to pairs of isolated DC voltage or current signals.
•Output-2 signal is selectable from a DC voltage signal, DC
current signal, communication function (RS-485), and alarm
output (two relay contacts).
Keep this manual in a safe place.
59±0.3
Fig. 4.2
4.2DIN Rail Mounting
Locate the computing unit 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)
DIN rail
Slide lock
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
IM 77J01X07-01E
1st Edition Jan. 2000
2nd Edition June 2004
2
NOTE
4.3Mounting Using a Multi-mounting Base
For mounting using a multi-mounting base, see the Instruction
Manual for VJCE (VJ Mounting Base).
4.4Using Ducts
Wiring ducts should be installed at least 30 mm away from the top
or bottom of the main unit.
4.5I
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 Ω
Externally
connected for
current input
Shunt resistor
(Externally connected
for current input)
3 2
Output-2 signal
1
4
789
Analog output
Output-1 signal
Analog output
56
1011
Alarm output
+
2
–
5
+
7
–
9
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.
Power supply
L+
10
N–
11
GND
8
Fig. 6.1
● 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, opera-
● If this instrument is used in a manner not sepecified in
this manual, the protection provided by this instrument
may be impaired.
● If the product is operated by a power supply exceeding
the specifications, the product may become extremely
hot and, as a result, damaged. To prevent this, ensure
the following before turning on the power.
(a) The voltage of the supplied power and the input
signal level meet the specifications of the product.
(b) External wires are connected to the correct termi-
nals (refer to Chapter 5).
● 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. DESCRIPTION OF FRONT PANEL
AND CONNECTION OF SETTING
TOOLS
7.1Front Panel
The communications connector in the front panel is used for setting up parameters through a PC (VJ77 PC-based Parameters Setting Tool) or the Handy Terminal. The RLY1 and RLY2 LEDs
light up if a contact is ON (those LEDs are provided only when the
output-2 is specified for contact output.)
Communications connector
8. SETTING PARAMETERS
Set the parameters using a PC (VJ77 PC-based Parameters Setting
Tool) or the Handy Terminal. Refer to the list of parameters in this
manual and the Instruction Manual for Handy Terminal (IM JF8102E) and VJ77 PC-based Parameters Setting Tool (IM 77J01J7701E).
8.1Settings Related to Inputs and Outputs
8.1.1Input Type
Set by selecting input type from among VOLTS (DC voltage) and
CURRENT (DC current) in D16: INP TYPE.
8.1.2Input Hard Range
Set by selecting the input hard range from among AUTO, HIGH,
MIDDLE, and LOW in D17: SELECT RANGE. Generally, select
AUTO.
● AUTO: Sets the input hard range automatically with respect to
the input range to be set.
● HIGH: For a span of 5 V or more in an input range of -10 to
+10 V
● MIDDLE: For a span of 2.5 V or more in an input range of -5
to +5 V
● LOW: For a span of 0.5 V or more in an input range of -1 to
+1 V
The conditions for the input hard range (HIGH, MIDDLE,
and LOW) are specified for operations within the range of
accuracy rating. The input range may be set to a range not
meeting these conditions, but take note of accuracy limitations. Similar accuracy limitations exist even when AUTO
is selected. For more information on accuracy limitations,
see the general specifications of VJH7 (GS 77J1H07-01E).
Contact output-1 LED
(lights up if an alarm occurs)
Contact output-2 LED
(lights up if an alarm occurs)
* The LEDs are provided only when output-2
is specified for contact output.
RLY 1
RLY 2
Fig. 7.1 Front Panel
7.2Connecting the Setting Tools
Connect the modular jack-to-connector adapter (E9786WH) to the
JUXTA communication cable with 5-pin connector (F9182EE)
and then connect this adapter to the communication connector of
JUXTA.
JUXTA communication cable with
5-pin connectors (F9182EE)
JHT200
Handy T erminal
Fig. 7.2 Connecting the Handy Terminal
[Provided with VJ77, JHT200]
Modular jack conversion
adapter (E9786WH)
[Provided with VJ77]
Dedicated adapter (E9789HA)
[Provided with VJ77]
Dedicated cable (E9786WK)
[Provided with VJ77]PC
8.1.3Input Range
Set the 0% value of input range to D22: INPUT1 L_RANGE and
the 100% value of input range to D23: INPUT1 H_RANGE within
the numerically specified range.
8.1.4Selection of Program Function
Select the following communication functions in D32:PRGM SELECT.
(A) free program, (B) moving average, (C) dead time, (D) first-order lag, (E) first-order lead, (F) velocity limiter, (G) limiter, (H)
velocity computation, (J) linearizer, and (K) ratio setter
8.1.5Computation Cycle Time
Set the computation cycle time by selecting either 100 ms or 200
ms in D35:CYCLE TIME.
8.1.6Direction of Output Action
Analog output signals can be reversed. To reverse the signal from
output-1, set D38: OUT1 DR to REVERSE. For output-2, set D39
OUT2 DR to REVERSE. To return the output-1 signal to normal,
set D38: OUT1 DR to DIRECT. For output-2, set D39: OUT2 DR
to DIRECT.
8.2Settings Related to Communication
Function
Set the following parameters when output-2 is specified for communication function. For more information on the communication
function, see the Instruction Manual for VJ Series Communication
Function (IM 77J1J11-01E).
8.2.1Communication Protocol
Set the communication protocol by selecting from among PCLINK, PC-LINK WITH SUM, MODBUS ASCII, MODBUS
RTU, and LADDER in F01: PROTOCOL.
Set the address number of the isolator numerically in a range of 1
to 99 in F02: ADDRESS.
8.2.3Baud Rate
Set the baud rate by selecting from among 1200, 2400, 4800, and
9600 bps in F03: BAUD RATE.
8.2.4Parity
Select and set NONE, EVEN, or ODD in F04: PARITY.
8.2.5Data Length
Select and set 7 bits or 8 bits in F05: DATA LEN.
8.2.6Stop Bit
Select and set 1 bit or 2 bits in F06: STOP BIT.
9. COMPUTING FUNCTION
9.1VJX7-A (Free Program)
This computing unit is used to meet individual applications by
programming the available commands using a PC (PC-based Parameters Setting Tool) or the Handy Terminal. Set the computing
program in G01 to G40.
9.2VJX7-B (Moving Average Computation)
This computing unit stores the input values sampled at intervals of
one-fortieth of the moving-average time (L) into 40 buffers in order, and outputs the moving average of 40 input values (Output-1=
Y1, Output-2= Y2). The output between samplings is smoothed
out by interpolation. Minimum sampling time is the set computing
period. Therefore, when the moving-average time is set shorter,
the number of samplings is less than 40. When using a first-order
lag filter for input (X), set the first-order lag time constant (T).
Set the moving-average time (L) at % value in H02: CONST. The
value of 0 to 100.0% corresponds to that of 0 to 1000 seconds. For
example, enter “6” to set in H02 when setting 60 seconds.
● Setting range of moving-average time:
0 to 320,000 seconds (about 3.7 days) with 4 significant digits
Minimum unit is 1 second (however, 0.1 second is possible
for 4 seconds or shorter).
( e.g. 12345% is impossible, 12340% is possible.)
First-order lag time constant (T) is set at % value in H01:
CONST. The value of 0 to 100% corresponds to that of 0 to
100 seconds.
● Setting range of time constant:
0 to 799.0 seconds; minimum unit is 0.1 second.
● Accuracy of moving average and time constant setting:
(±5.0% of set value) ± 1 second
e.g.
Moving average=
X
37
X
38
X
39
X
40
Note: For the moving average times at 1, 2 and 3
second, the number of samplings is 10, 20 and
30, respectively (when the computing period is
100 ms).
X1+X2+ ••••• X40
40 (Note)
X
5
X
4
X
35
X
36
X
Computation time
3
X
2
X
1
Time
9.3 VJX7-C (Dead Time Computation)
This computing unit stores the input values (X) sampled at intervals of one-fortieth of the dead time (L) into 40 buffers in order
and outputs data (output-1=Y1, Output-2= Y2) after the dead time
has elapsed. Minimum sampling time is the set computing period.
Therefore, when the dead time is set shorter, the number of samplings is less than 40. However, for the dead times of 3, 2 and 1
second, the number of samplings is 30, 20, and 10, respectively
(when the computing period is 100ms). The output between samplings is smoothed out by interpolation. When using a first-order
lag filter for input (X), set the first-order lag time constant (T). Set
the dead time (L) at % value in H02: CONST. The value of 0 to
100.0% corresponds to that of 0 to 1000 seconds. For example,
enter “6” to set in H02 when setting 60 seconds.
● Setting range of dead time:
0 to 320,000 seconds (about 3.7 days) with 4 significant digits
Minimum unit is 1 second (however, 0.1 second is possible
for 4 seconds or shorter).
( e.g. 12345% is impossible, 12340% is possible.)
First-order lag time constant (T) is set at % value in H01: CONST.
The value of 0 to 100% corresponds to that of 0 to 100 seconds.
● Setting range of time constant:
0 to 799.0 seconds; minimum unit is 0.1 second.
● Accuracy of dead time and time constant setting:
(±5.0% of set value) ± 1 second
-LS
Y1=Y2=X
e
1+TS
e.g. 0% → 100% step input
9.4VJX7-D (First-order Lag Computation)
This computing unit provides a first-order lag computation on input (X) with a time constant (T) and outputs the result (output1=Y1, output-2=Y2). Set the time constant (T) at % value in H01:
CONST. The value of 0 to 100% corresponds to that of 0 to 100
seconds.
This computing unit provides a first-order lead computation on input (X) with a time constant (T) and outputs the result (output1=Y1, output-2=Y2). Set the time constant (T) at % value in H01:
CONST. The value of 0 to 100% corresponds to that of 0 to 100
seconds.
● Setting range of time constant:
0 to 799.0 seconds; minimum unit is 0.1 second.
● Accuracy of time constant setting:
(±5.0% of set value) ± 1 second
Y1=Y2= (1+) X
e.g. 0% → 50% step input
Input 0%
68.4%
Output 0%
TS
1+TS
T
50%
100%
50%
9.6VJX7-F (Velocity Limiter)
This computing unit limit the input (X) velocity at the ascending
velocity limit for a positive change and the descending velocity
limit for a negative change, and outputs the limited value (output1=Y1, output-2=Y2). When the input velocity (slope) is no more
than the limit value, the unit outputs the input as is.
Set the ascending velocity limit at % value in H01:CONST, and
the descending velocity limit at % value in H02:CONST. The
value of 0 to 100.0% corresponds to that of 0 to 100.0%/minute.
e.g. 0% → 100% → 0% step input
100%
Input 0%
Output 0%
Ascending velocity limit
(%/minute)
● Setting range of velocity limit value:
0.1% to 699.9%/minute; minimum unit is 0.1%/minute.
Setting the limit at 700%/minute or above does not limit the
input, so the unit simply outputs the input as is (i.e., works as
an open limit function).
● Accuracy of velocity limit setting:
(±5.0% of set value) ± 1 %/minute
100%
Descending velocity limit
(%/minute)
9.7VJX7-G (Limiter)
This computing unit serves as an ordinary converter as long as the
input (X) is within the upper and lower limits. When the input exceeds the limit, the unit outputs the signal that corresponds to the
limit value (output-1=Y1, output-2=Y2).
Set the upper limit at % value in H01:CONST, and the lower limit
at % value in H02:CONST.
● Setting range of upper and lower limit value:
-6.0% to 106.0%; minimum unit is 0.01%.
However, if the setting is made so that the upper limit < lower
limit, the unit outputs the upper limit value.
9.8VJX7-H (Velocity Computation)
This computing unit calculates the input velocity by subtracting
the input of the last velocity computation (XL) from the present
input (X). The unit then adds a 50% bias to one-half of the obtained velocity and outputs the result (output-1=Y1, output2=Y2). The output results is 50% when the input is not changed,
50% or more when the input increases (100% for X-XL 100%),
and 50% or less when the input decreases (0% for X-XL –100%).
When using a first-order lag filter for input (X), set the first-order
lag time constant (T).
X–X
Y1=Y2=+50%
Set the velocity computation time (L) at % value in H02: CONST.
The value of 0 to 100.0% corresponds to that of 0 to 1000 seconds.
For example, enter “6” to set in H02 when setting 60 seconds.
● Setting range of velocity computation time:
0 to 320,000 seconds (about 3.7 days) with 4 significant digits
Minimum unit is 1 second (however, 0.1 second is possible
for 4 seconds or shorter).
( e.g. 12345% is impossible, 12340% is possible.)
First-order lag time constant (T) is set at % value in H01:
CONST. The value of 0 to 100% corresponds to that of 0 to
100 seconds.
● Setting range of time constant:
0 to 799.0 seconds; minimum unit is 0.1 second.
● Accuracy of moving average and time constant setting:
(±5.0% of set value) ± 1 second
L
2
9.9VJX7-J (Linearizer)
This computing unit gives an optional relationship between the input (X) and output (output-1=Y1, ouput-2=Y2) signals using an
optional line-segment function. The line-segment function has 21
breakpoints, which each gives an input-output relationship as a
percentage (%). Set the input (X) at % value in H01:CONST to
H21:CONST, and the output (Y) at % value in H22:CONST to
H42:CONST.
● Breakpoint (21 points) setting conditions:
For input: -6.0⬉X0 (H01) to X20 (H21)⬉106.0%; minimum
unit is 0.01%
X0<X1<X2< ····· <X20
For output: -6.0⬉Y0 (H22) to Y20 (H42)⬉106.0%; minimum
unit is 0.01%
When input⬉X0 (H01), Y0 (H21) is output.
When input⭌20 (H22), Y20 (H42) is output.
● Computation accuracy:
±1 % (when line-segment gain is 1 or less)
9.10 VJX7-K (Ratio Setter)
This computing unit sets the ratio by the following expression.
Y1=Y2=K1 × (X+A1)+A2
where Y1:Output-1 signal (%)
Y2:Output-2 signal (%)
X:Input signal (%)
K1:Ratio (no unit)
A1, A2: Bias (%)
Set the ratio (K1) in H01:CONST, and the bias (A1) at % value in
H02:CONST, and the bias (A2) at % value in H03:CONST.
● Setting range of ratio:
-320 to 320 with 4 significant digits; minimum unit is
0.00001.
● Setting range of bias:
-32,000% to 32,000% with 4 significant digits; minimum unit
is 0.001%.
● Computation accuracy:
± 1 % (when K1=1, A1=A2=0%)
Set the ratio or bias not to exceed ±9×1020% during the computation. The computation result of ratio or bias is 4 significant digits.
D01 Tag no. 1TAG NO.1F01 Communication protocolPROTOCOL
D02 Tag no. 2TAG NO.2F02 AddressADDRESS
D03 Comment 1COMMENT1F03 Baud rateBAUD RATE
D04 Comment 2COMMENT2F04 ParityPARITY
D16 Input typeINP TYPEF05 Data lengthDATA LEN
D17 Selection of input hard rangeSELECT RANGEF06 Stop bitSTOP BIT
D18 Input resistorIN RESIST
D22 Input low rangeINPUT1 L_RNG
D23 Input high rangeINPUT1 H_RNG
D32 Selection of programPRGM SELECT
D35 Computing periodCYCLE TIME
D38 Direction of output-1 actionOUT1 DR
D39 Direction of output-2 actionOUT2 DR
D60 Self-check resultSELF CHK
GProgram of computing unitPROGRAMHFixed constant of computing unitCONST
P02 Zero adjustment of input-1ZERO ADJ1Q02 Forced output 1OUT1 TEST
P03 Span adjustment of input-1SPAN ADJ1Q03 Forced output 2OUT2 TEST
P12 0% adjustment of output-1OUT1 0%Q06 Forced output (relay 1)RLY1 TEST
P13 100% adjustment of output-1OUT1 100%Q07 Forced output (relay 2)RLY2 TEST
P14 0% adjustment of output-2OUT2 0%Q60 Self-check resultSELF CHK
P15 100% adjustment of output-2OUT2 100%
P17 Adjustment of external input resistanceRESISTOR ADJ
P60 Self-check resultSELF CHK
Programming itemsFixed constant setting items
Adjusting itemsTest items
6
Display items
Setting items
There are items not displayed depending on what output-2 is specified.
11.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.
For cleaning the instrument, use a soft and dry cloth.
11.1 Calibration Apparatus
● A voltage and current generator (Yokogawa 7651 or the
equivalent)
● A voltmeter (Yokogawa 7562 or the equivalent)
●
A precision resistor of 250 ⍀ ± 0.01%, 1 W (for current output)
11.2 Calibration Procedure
Connect the instruments as shown in Fig. 10.1. First adjust the output-1 signal and then the output-2 signal.
Produce input signals equivalent to 0, 25, 50, 75, and 100% of the
input span from the voltage and current generator to the isolator.
Then, check that the isolator’s output signal shows voltages corresponding to 0, 25, 50, 75, and 100% of the input span within the
rated accuracy range.
If the output signal is out of the rated accuracy range, adjust the
output signal level using PC (VJ77 PC-based Parameters Setting
Tool) or the Handy Terminal (JHT200).