Yokogawa VJQ7 User Manual

User’s
Manual

IM 77J01Q17-01E

Model VJQ7
Analog/Pulse Transmitter

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 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: [phone] Facsimile: [phone]

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 Ω
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 1␮F 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

3

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 in-

put signal level meet the specifications of the prod­uct.

(b) External wires are connected to the correct ter-

minals (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 ALM1 and ALM2 LEDs
light up if an alarm occus (those LEDs are provided only when the
output-2 is specified for alarm 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 re-

spect 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 VJQ7 (GS 77J1Q17-01E).

Alarm output-1 LED

(lights up if an alarm occurs)

Alarm output-2 LED

(lights up if an alarm occurs)

* The LEDs are provided only when output-2

is specified for alarm output.

ALM 1

ALM 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 Setting Tools

[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 Output Range Unit

When referring and setting the output range, select and set Hz or
kHz in D10: UNIT.

8.1.5 Output Range

Set the 0% value of output range in D24: OUT L_RNG, and 100%
of output range in D25: OUT H_RNG within the numerically
specified range.

8.1.6 Pulse Width Type

Select and set "50%" (duty 50%), "ON PULSE" (ON-state pulse
width fixed), or "OFF PULSE" (OF-state pulse width fixed) in
D46: PULSE TYPE.

8.1.7 Pulse Width Time

The pulse width time is set when the pulse width type is set to "ON
PULSE."
Select and set the numerical value in D43: PULSE WIDTH.
Pulse width setting range: 0.1 to 500ms, by 0.1ms
The output frequency when ON-state pulse width or OFF-state
pulse width is fixed is as follows. The frequency over the follow­ing frequency is limited.

1

Pulse width set value(ms)×2

×1000[Hz]

All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01Q17-01E 3rd Edition Mar.31,1997-00

4

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.

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.

8.2.7 Input Decimal Point Position

Namber of digits of decimal places can be set.
Select and set among 0 to 5 digits in F07: INPUT DEC PT.

8.3 Settings Related to Alarm Output

Set the following parameters when output-2 is specified for alarm
output.

8.3.1 Alarm Setpoints

Set the alarm setpoints of alarm-1 and alarm-2 in E03: SET
POINT1 and E04: SET POINT2 numerically.

● Setting range: A range of 0 to 100% of input range

● Setting resolution: 0.1%

8.3.2 Direction of Alarm Action

Select the direction of alarm-1 action and that of alarm-2 action from
among HIGH ALM (high-limit alarm) and LOW ALM (low-limit
alarm) and set each in E05: ALM1 ACTION (direction of alarm-1
action) or E06: ALM2 ACTION (direction of alarm-2 action).

● To activate alarm status when input signal ⱖ alarm setpoint,

select HIGH ALM.

● To activate alarm status when input signal ⱕ alarm setpoint,

select LOW ALM.

8.3.3 Hysteresis

Set alarm-1 and alarm-2 hysteresis, in E09: HYSTERESIS1 and
E10: HYSTERESIS2. Hysteresis is a value added to the alarm
setpoint in order for an alarm status to be released (to normal) after
the alarm status has been activated. The alarm status will be re­leased in the following conditions, depending on the direction of
alarm action.
* When HIGH ALM (high-limit alarm) is set: Alarm is released

when input signal < (alarm setpoint - hysteresis).

* When LOW ALM (low-limit alarm) is set: Alarm is released

when input signal > (alarm setpoint + hysteresis).

● Setting range: A range of 0 to 100% of input range

● Setting resolution: 0.1%

8.3.4 Alarm ON Delay and Alarm OFF Delay

Set alarm-1 and alarm-2 ON delays in E11: ON DELAY1 and
E12: ON DELAY2 and then alarm-1 and alarm-2 OFF delays in
E13: OFF DELAY1 and E14: OFF DELAY2.
An alarm ON delay is a delay time from the establishment of alarm
condition to alarm output; an alarm OFF delay is a delay time from
the establishment of return-to-normal condition to output.

● Setting range: 0 to 999 seconds

● Setting resolution: 1 second (Note that about 0.2 second will

be added to set time to prevent erroneous operation.)
For example, when an alarm ON delay is set to 1 second, alarm
output is generated if alarm status continues for more than 1 sec­ond after the input value exceeds the alarm setpoint. Further, when
an alarm OFF delay is set to 2 seconds, alarm output is released if
normal condition continues for more than 2 seconds after the input
value has returned to normal from the alarm status.

8.3.5 Direction of Relay Action

Set the direction of relay energizing in alarm-1 normal condition
and alarm-2 normal condition by selecting from among NRM DE­ENERGIZED (de-energized under normal condition) and NRM
ENERGIZED (energized under normal condition) in E15: RL1
ACTION and E16: RL2 ACTION and set them.

All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01Q17-01E

9. DESCRIPTION OF ALARM ACTIONS

This chapter describes examples of alarm actions under the following conditions.

metI

noitcamralafonoitceriDNOITCA1MLA:50Emralatimil-hgiHNOITCA2MLA:60Emralatimil-woL

gnittesmralA1TNIOPTES:30E%082TNIOPTES:40E%51

siseretsyH1SISERETSYH:90E%012SISERETSYH:01E%5

yaledNOmralA1YALEDNO:11E.ces12YALEDFFO:21E.ces3

yaledFFOmralA1YALEDFFO:31E.ces22YALEDFFO:41E.ces4

[%]

100

mralafonoitpircseD

Alarm conditions established

[1] [2]

Alarm conditions established

High-limit alarm ON

Normal conditions established

Normal conditions established

snoitca

1-mralA2-mralA

retemaraPtniopteSretemaraPtniopteS

.lamronotsnrutersutatseht,sdnoces2

[1]: Alarm status does not continue for more than 1 second after the

High-limit alarm OFF

alarm conditions are established at alarm-1.

[2]: Normal status does not continue for more than 2 seconds after the

normal conditions are established at alarm-1.

[3]: Alarm status does not continue for more than 3 seconds after the

alarm conditions are established at alarm-2.

[4]: Normal status does not continue for more than 4 seconds after the

normal conditions are established at alarm-2.

5

tupniehterehwnoitidnocehtfisdnuosmralaehT

seunitnocmralatimil-hgihfoeromro%08sieulav

,sdnuosmralaehtretfA.dnoces1nahteromrof
nahtsselsieulavtupnierehwnoitidnocehtnehw
nahteromrofseunitnocmralatimil-hgihehtfo%07

tupniehterehwnoitidnocehtfisdnuosmralaehT

seunitnocmralatimil-wolfosselro%51sieulav

,sdnuosmralaehtretfA.sdnoces3nahteromrof

nahteromsieulavtupnierehwnoitidnocehtnehw

nahteromrofseunitnocmralatimil-wolehtfo%02

.lamronotsnrutersutatseht,sdnoces4

80

60

40

20
15

Alarm-1 action
Alarm-2 action

1 sec.

Alarm-2 hysteresis (5%)

0

Normal

Alarm-1 ON delay

2 sec.

Alarm-1 OFF delay

Alarm-2 setpoint (15%)

Alarm

Normal Alarm Normal

Alarm-1 setpoint (80%)

Alarm-1 hysteresis (10%)

Alarm conditions

established

[3] [4]

Alarm-2 ON delay

Alarm conditions

established

3 sec. 4 sec.

Low-limit alarm ON

Normal

Normal conditions

established

Alarm-2 OFF delay

Normal conditions

established

Elapsed time

Low-limit alarm OFF

1 sec.

All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01Q17-01E

10.LIST OF PARAMETERS

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

A Dispay1 DISPLAY1 B Dsplay2 DISPLAY2
A01 Input value INPUT1 B01 Input value INPUT1
A02 Output value OUTPUT B02 Output value OUTPUT
A07 Alarm-1 status ALM1 STATUS B07 Alarm-1 status ALM1 STATUS
A08 Alarm-2 status ALM2 STATUS B08 Alarm-2 status ALM2 STATUS
A54 Status STATUS *1 B60 Self-check result SELF CHK
A56 Rev. no REV NO
A58 Menu rev. MENU REV *1: The Status is displayed for service personnel to see history records.
A60 Self-check result SELF CHK

D Setting (I/O) SET(I/O) E Setting (alarm output) SET(ALM)
D01 Tag no. 1 TAG NO.1 E03 Alarm-1 setting SET POINT1
D02 Tag no. 2 TAG NO.2 E04 Alarm-2 setting SET POINT2
D03 Comment 1 COMMENT1 E05 Direction of alarm-1 action
D04 Comment 2 COMMENT2 E06 Direction of alarm-2 action
D10 Output range unit UNIT E09 Alarm-1 hysteresis
D14 Low output cut point LOW CUT E10 Alarm-2 hysteresis
D16 Input type INP TYPE E11 Alarm-1 ON delay setting ON DELAY1
D17 Selection of input hard range SELECT RANGE E12 Alarm-2 ON delay setting ON DELAY2
D18 Input resistance IN RESIST E13 Alarm-1 OFF delay setting OFF DELAY1
D22 Input low range INPUT1 L_RNG E14 Alarm-2 OFF delay setting OFF DELAY2
D23 Input high range INPUT1 H_RNG E15 Direction of alarm-1 relay action RL1 ACTION
D24 Output low range OUT L_RNG E16 Direction of alarm-2 relay action RL2 ACTION
D25 Output high range OUT H_RNG E60 Self-check result SELF CHK
D46 Pulse width type PULSE TYPE F Setting (communication) SET(COM)
D47 Pulse width time PULSE WIDTH F01 Communication protocol PROTOCOL
D60 Self-check result SELF CHK F02 Address ADDRESS

There are items not displayed depending on what output-2 is specified. F05 Data length DATA LEN

Adjusting items Test items
P Adjustment ADJUST Q Test TEST
P02 Zero adjustment of input-1 ZERO ADJ Q04 Forced output (alarm) ALM1 TEST
P03 Span adjustment of input-1 SPAN ADJ1 Q05 Forced output (alarm) ALM2 TEST
P17 Adjustment of external input resistance RESISTOR ADJ Q08 Forced output OUT TEST
P60 Self-check result SELF CHK Q60 Self-check result SELF CHK

Display items

Setting items

ALM1 ACTION
ALM2 ACTION

HYSTERESIS1

HYSTERESIS2

F03 Baud rate BAUD RATE
F04 Parity PARITY

F06 Stop bit STOP BIT
F07 Decimal point position of input
F60 Self-check result SELF CHK

INPUT DEC PT

6

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

● Voltage/current generator (Yokogawa 7651 or the equiva-

lent): 1

● A counter(Yokogawa TC100 or the equivalent) or oscillo-

scope (Yokogawa DL1540 or the equivalent): 1

● A resistor (1k⍀, 1.6 k⍀): 1 each

● 6V battery: 1

11.2 Calibration Procedure

Connect the instruments as shown in Fig.11.1. 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 to the converter from the voltage and current generator.
Then, check that the converter's output signal shows the outputs cor­responding to 0, 25, 50, 75, and 100% of the input span within the
rated accuracy range. Take the same calibration procedure for the
output-2, and confirm that the frequency of the output 2 is the same
as that of the output 1.
When using a oscilloscope, the wave shaping of output pulse can be
confirmed.
If the output signal is out of the rated accuracy range, adjust the out­put signal level using the Handy Terminal (JHT200). For adjust­ment, refer to Instruction Manual for VJ77 Parameters Setting Tools
(IM 77J01J77-01) or for Handy Terminal (IM JF82-01).

3 2

56

1011

Power supply

L+

N–

GND

11

10 8

Fig. 11.1

Shunt resistor
(Externally connected for current input)

Input signal

1
3

1

R:100Ω
Externally connected for current input

+

–

Voltage and

current

Generator

R

4

Calibration for output-2

+

Counter or

Osilloscope

–

789

2
5

1kΩ

1.6kΩ

Calibration for output-1

+

Counter or

Osilloscope

–

7
9

1kΩ

1.6kΩ

6V
Battery

6V
Battery

All Rights Reserved. Copyright © 1999, Yokogawa M&C Corporation IM 77J01Q17-01E