Yokogawa VJX7 User Manual

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Instruction

Uni

Manual

IM 77J01X07-01E

Model VJX7 Universal Computing Unit

1. CAUTIONARY NOTES FOR SAFE USE OF THE PRODUCT

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 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

4.1.1 Mounting 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

4.2 DIN 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

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

ALM2

29.5 or more

ALM1

ALM2

(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

–

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

1011

Alarm output

–

ALM1

COM

ALM2

RS-485

communication

B+

A–

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+

N–

GND

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-

tors can not replace the fuse.

NOTE

IMPORTANT

● 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

7.1 Front 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).

8.1 Settings Related to Inputs and Outputs

8.1.1 Input Type

Set by selecting input type from among VOLTS (DC voltage) and CURRENT (DC current) in D16: INP TYPE.

8.1.2 Input 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

7.2 Connecting 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

8.1.3 Input 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.

8.1.4 Selection 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

8.1.5 Computation Cycle Time

Set the computation cycle time by selecting either 100 ms or 200 ms in D35:CYCLE TIME.

8.1.6 Direction 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.

8.2 Settings 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).

8.2.1 Communication Protocol

Set the communication protocol by selecting from among PCLINK, PC-LINK WITH SUM, MODBUS ASCII, MODBUS RTU, and LADDER in F01: PROTOCOL.

Input

Output

8.2.2 Communication Address

Set the address number of the isolator numerically in a range of 1 to 99 in F02: ADDRESS.

8.2.3 Baud Rate

Set the baud rate by selecting from among 1200, 2400, 4800, and 9600 bps in F03: BAUD RATE.

8.2.4 Parity

Select and set NONE, EVEN, or ODD in F04: PARITY.

8.2.5 Data Length

Select and set 7 bits or 8 bits in F05: DATA LEN.

8.2.6 Stop Bit

Select and set 1 bit or 2 bits in F06: STOP BIT.

9. COMPUTING FUNCTION

9.1 VJX7-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.

9.2 VJX7-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=

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)

Computation time

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

1+TS

e.g. 0% → 100% step input

9.4 VJX7-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.

● 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

-LS

Y1=Y2= X

e.g. 0% → 100% step input

Input 0%

63.2%

Output 0%

1+TS

100%

NOTE

9.5 VJX7-E (First-order Lead Computation)

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%

1+TS

50%

100% 50%

9.6 VJX7-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)

9.7 VJX7-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.

9.8 VJX7-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:

● 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

9.9 VJX7-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.

10.LIST OF PARAMETERS

1011

3 2

1 4

789

L+

N–

GND

Power supply

Analog output

Output-1 signal

Voltmeter

R: For current output using 250 Ω

precision resistor

Voltage and

current

generator

–

Analog output

Output-2 signal

Voltmeter

R: For current output using 250 Ω

precision resistor

–

Input signal

–

Analog input

R: 100 Ω Externally connected for current input

Shunt resistor

(Externally connected

for current input)

No. Item Display Remarks No. Item Display Remarks

01 Model MODEL 02 Tag No. TAG NO 03 Self-check result SELF CHK

A Display1 DISPLAY1 B Display2 DISPLAY2 A01 Input value INPUT1 B01 Input value INPUT1 A03 Output value 1 OUTPUT1 B03 Output value 1 OUTPUT1 A04 Output value 2 OUTPUT2 B04 Output value 2 OUTPUT2 A09 Temporary memory 1 T1 B09 Temporary memory 1 T1 A10 Temporary memory 2 T2 B10 Temporary memory 2 T2 A11 Temporary memory 3 T3 B11 Temporary memory 3 T3 A12 Temporary memory 4 T4 B12 Temporary memory 4 T4 A14 Digital output DO B14 Digital output DO A15 Load factor LOAD B15 Load factor LOAD A54 Status STATUS *1 B55 Status MENU REV A55 MENU REV MENU REV B60 Self-check result SELF CHK A60 Self-check SELF CHK *1 The Status is displayed for service personnel to see history records.

D Setting (I/O) SET(I/O) F Setting (communication) SET (COM)

D01 Tag no. 1 TAG NO.1 F01 Communication protocol PROTOCOL D02 Tag no. 2 TAG NO.2 F02 Address ADDRESS D03 Comment 1 COMMENT1 F03 Baud rate BAUD RATE D04 Comment 2 COMMENT2 F04 Parity PARITY D16 Input type INP TYPE F05 Data length DATA LEN D17 Selection of input hard range SELECT RANGE F06 Stop bit STOP BIT D18 Input resistor IN RESIST D22 Input low range INPUT1 L_RNG D23 Input high range INPUT1 H_RNG D32 Selection of program PRGM SELECT D35 Computing period CYCLE TIME D38 Direction of output-1 action OUT1 DR D39 Direction of output-2 action OUT2 DR D60 Self-check result SELF CHK

G Program of computing unit PROGRAM H Fixed constant of computing unit CONST

G01 Program PROGRAM H01 Fixed constant CONST

↑↑ ↑ ↑ ↑ ↑

↓↓ ↓ ↓ ↓ ↓

G40 Program PROGRAM H59 Fixed constant CONST G60 Self-check result SELF CHK H60 Self-check result SELF CHK

P Adjustment ADJUST1 Q Test TEST

P02 Zero adjustment of input-1 ZERO ADJ1 Q02 Forced output 1 OUT1 TEST P03 Span adjustment of input-1 SPAN ADJ1 Q03 Forced output 2 OUT2 TEST P12 0% adjustment of output-1 OUT1 0% Q06 Forced output (relay 1) RLY1 TEST P13 100% adjustment of output-1 OUT1 100% Q07 Forced output (relay 2) RLY2 TEST P14 0% adjustment of output-2 OUT2 0% Q60 Self-check result SELF CHK P15 100% adjustment of output-2 OUT2 100% P17 Adjustment of external input resistance RESISTOR ADJ P60 Self-check result SELF CHK

Programming items Fixed constant setting items

Adjusting items Test items

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).

Fig. 11.1

Yokogawa VJX7 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual