Yokogawa VJXS User Manual

User’s

Model
Function
A: Free program G: Limiter
B: Moving average

H: Velocity computation
C: Dead time J: Linearizer
D: 1st-order lag K: Ratio setter
E: 1st-order lead
F: Uniform-speed response (velocity limiter)

Output
1: 1 output
2: 2 outputs

Power supply
6: 100-240 V AC/DC (Operating range: 85 to 264 V)
7: 15-30 V DC

(Operating range: 12 to 36 V)

Input signal
A: 0 to 50 mA DC Span is 1 mA or more
B: 0 to 10 mA DC Span is 0.1 mA or more
1: −10 to +10 V DC Span is 0.1 V or more
2: −2 to +2 V DC Span is 10 mV or more

Output-1 signal
A: 0 to 20 mA DC Span is 2 mA or more
B: 0 to 5 mA DC Span is 1 mA or more
1: 0 to 10 V DC Span is 0.1 V or more
2: 0 to 100 mV DC Span is 10 mV or more
3: −10 to +10 V DC Span is 0.2 V or more
4: −100 to +100 mV DC

Span is 20 mV or more

Output-2 signal
A: 4 to 20 mA DC 6: 1 to 5 V DC
N: No output-2

Optional specification
/R250: With 250 Ω receiving resistor
/SN: Without socket

VJXS- - 0/

Manual

Model VJXS
Universal Computing Unit
(Isolated 1-output,
Isolated 2-output Type)

IM 77J01X11-01E

Please read through this User’s Manual before use for correct handling.
Please keep this User’s Manual for future reference.

IM 77J01X11-01E

1st Edition Aug. 2005 (YK)

2nd Edition Nov. 2005 (YK)

Network Solutions Business Division

2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan
Phone: [phone] Facsimile: [phone]

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.

IMPORTANT

Indicates that operating the hardware or software in a
particular manner may cause damage or result in a system
failure.

NOTE

Draws attention to essential information for understanding
the operations and/or functions of the product.

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 main unit are as ordered.

(2) Packaged Items

Check that the package contains the following items:

● VJXS: 1

● Range label: 1

● Receiving resistor (for current input): 1

● User’s Manual (this manual: IM 77J01X11-01E): 1

* When the optional specification “/R250” is specified, the 250 Ω

receiving resistor is attached. When the optional specification
“/R250” is not specified, the 100 Ω receiving resistor is attached.

GENERAL

This plug-in type universal computing unit receives DC current or DC
voltage signals, applies various computing functions to them, and then
converts them into isolated DC current or DC voltage signals.

MODEL AND SUFFIX CODES

1. MOUNTING METHOD

NOTE

Plug/disconnect the main unit into/from the socket
vertically to the socket face. Otherwise the terminals may
bend and it may cause bad contact.

1.1 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.

Mounting

screws

Socket

2. 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
Installation altitude: 2000 m or less above sea level.

● 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 com­puting unit and a field-installed device.

● Operating temperature/humidity range: 0 to 50 C/5 to 90%RH (no
condensation)

3. EXTERNAL WIRING

WARNING

Main unit

Connector for
communication

Hole for main
unit-fixing screw

Main
unit-fixing
screw

<Mounting Dimensions>

29.5 or more

22±0.2

59±0.3

2-M4 or 2-ø4.5 or more

Unit: mm

1.2 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.

Fit into here

DIN rail

DIN rail

Push

(Rear of the socket)

DIN rail

Slide lock

1.3 Mounting Using a Multi-mounting Base

For mounting using a multi-mounting base, refer to the User’s Manual
for VJCE (VJ Mounting Base)(IM 77J01C51-01E).

1.4 Using Ducts

Wiring ducts should be installed at least 30 mm away from the top or
bottom of the main unit.

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.

Wires are connected to the terminals of the computing unit’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 mm
or thicker for signal cables, and that of 1.25 mm2 or thicker for
power cables.

Shunt resistor

(External receiving

resistor for

current input)

3 2

1

56

4

789

1011

Power supply

1110 8

N–

L+

GND

Input signal

+

1

R

3

–

R

: Receiving resistor

for current input

Output-2

+

2

–

5

Output-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

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IM 77J01X11-01E 2nd Edition Nov 30,2005-00

Power Supply and Isolation

Power supply rated voltage:

100-240 V AC/DC 50/60 Hz or 15-30 V DC

Power supply input voltage:

100-240 V AC/DC (−15, +10%) 50/60 Hz or
15-30 V DC (±20%)

Power consumption:

24 V DC 2.3 W, 110 V DC 2.2 W
100 V AC 4.6 VA, 200 V AC 6.4 VA

Insulation resistance:

100 MΩ or more at 500 V DC between input, output-1, output-2,
power supply, and grounding terminals mutually.

Withstand voltage:

2000 V AC for 1 minute between input, (output-1, output-2), power
supply and grounding terminals mutually.
1000 V AC for 1 minute between output-1 and output-2 terminals.

4. DESCRIPTION OF FRONT PANEL

5. SETTING PARAMETERS

Set the parameters using a PC (VJ77 Parameter Setting Tool) or the
Handy Terminal. Refer to “7. List of Parameters” in this manual and the
User’s Manual for VJ77 PC-based Parameters Setting Tool (IM
77J01J77-01E) or the User’s Manual for JHT200 Handy Terminal (IM
JF81-02E). Parameters are indicated inside the [ ].

■ Setting Input Range

Set the 0% value of input range in [D27: INPUT1 L_RNG] and the 100%
value of input range in [D28: INPUT1 H_RNG].

NOTE

Changing the input range resets the input adjusted value.

■ Setting Output-1 Range

Set the 0% value of output range in [D38: OUT1 L_RNG] and the 100%
value of output range in [D39: OUT1 H_RNG].

Connector for

communication

4.1 Connector for Communication

Use the connector for communication when setting the parameters us­ing a PC (VJ77 Parameters Setting Tool) or the Handy Terminal.

< How to connect with the setting tool>

JUXTA communication cable
with 5-pin connector (F9182EE)

[Provided with VJ77 and JHT200]
JHT200
Handy T erminal

Modular jack conversion
adapter (E9786WH)
[Provided with VJ77]

Dedicated adapter (E9789HA)
[Provided with VJ77]

Dedicated cable (E9786WK)
[Provided with VJ77]

PC which is installed

with the VJ77

*: Use the VJ77 of version R1.04 or later.

NOTE

Changing the output-1 range resets the output adjusted
value.

6. COMPUTING FUNCTIONS

6.1 VJXS-A Free Program

This computing unit is used to meet individual applications by pro­gramming the available commands using a PC (VJ77 Parameters
Setting Tool) or the JHT200 Handy Terminal. Set the computing pro­gram in G01 to G59.

6.2 VJXS-B Moving Average Computation

This computing unit stores the input values (X) 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 computation cycle.
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” in H02 to set 60 seconds.

● Setting range of moving-average time:
0 to 320000 seconds (about 3.7 days) with 4 significant digits;
minimum unit is 1 second (however, 0.1 second for a setting of 4
seconds or shorter).

0.0 to 32000% can be set in H02.
( e.g. 12345% unacceptable, 12340% acceptable)

● Setting accuracy of moving-average time : ( ±5.0% of set value)
±1 second

Set the first-order lag 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 first-order lag time constant:

1.0 to 799.0 seconds; minimum unit is 0.1 second.
However, when not using the first-order lag function, set 0 sec­ond.

● Setting accuracy of first-order lag time constant :
(±5.0% of set value) ±1 second

1+X2+ • • • • • X40

Moving average=

X

37

X

38

X

39

X

40

X

40 (Note)

X

5

X

4

X

X

35

X

36

3

X

2

X

1

Computation time

Time

Note: For the moving-average times at 3, 2 and 1

second, the number of samplings is 30, 20 and
10, respectively (when the computation cycle
is 100 ms).

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6.3 VJXS-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 computation cycle. Therefore,
when the dead time is set shorter, the number of samplings is less
than 40. The output between samplings is smoothed out by interpola­tion.
However, for the dead times of 3, 2 and 1 second, the number of sam­plings is 30, 20, and 10, respectively (when the computation cycle is
100ms). 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” in H02 to set 60 seconds.

● Setting range of dead time:
0 to 320000 seconds (about 3.7 days) with 4 significant digits;
minimum unit is 1 second (however, 0.1 second for a setting of
4 seconds or shorter). 0.0 to 32000% can be set in H02.
( e.g. 12345% unacceptable, 12340% acceptable)

● Setting accuracy of dead time: (±5.0% of set value) ±1 second.

Set the first-order lag 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 first-order lag time constant:

1.0 to 799.0 seconds; the value of 1.0 to 799.0% corresponds to
that of 1.0 to 799.0 seconds; minimum unit is 0.1 second.
However, when not using the first-order lag function, set 0 sec­ond.

● Setting accuracy of first-order lag time constant :
(±5.0% of set value) ±1 second

-L[s]

Y1=Y2= X

e.g. 0% → 100% step input

Input

Output

e

1+T[s]

L

6.4 VJXS-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 (output-1 = Y1, output­2 = 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 first-order lag time constant:

1.0 to 799.0 seconds; minimum unit is 0.1 second.

● Setting accuracy of first-order lag time constant :
(±5.0% of set value) ±1 second

Y1=Y2= X

e.g. 0% → 100% step input

Input 0%

63.2%

Output 0%

1

1+T[s]

100%

100%

T

6.5 VJXS-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 (output-1 = 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 first-order lead time constant:

1.0 to 799.0 seconds; minimum unit is 0.1 second.

● Setting accuracy of first-order lead time constant :
(±5.0% of set value) ±1 second

Y1=Y2= (1+ ) X

e.g. 0% → 50% step input

Input 0%

68.4%

Output 0%

T[s]

1+T[s]

T

50%
100%

50%

6.6 VJXS-F Uniform-speed Response (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 (output-1 = Y1, output­2 = 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.

● Setting range of velocity limit:

0.1 to 699.9%/minute; minimum unit is 0.1%/minute.
Setting the limit at 700.0%/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).

● Setting accuracy of velocity limit:
(±5.0% of set value) ±0.1%/minute

e.g. 0% → 100% → 0% step input

100%

Input 0%

Output 0%

Ascending velocity limit

(%/minute)

100%

Descending velocity limit
(%/minute)

6.7 VJXS-G Limiter

This computing unit serves as an ordinary computing unit 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 limits:

−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.

6.8 VJXS-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, output-2 = 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 0.0 to 100.0% corresponds to that of 0 to 1000 seconds. For
example, enter “6” in H02 to set 60 seconds.

● Setting range of velocity computation time:
0 to 320000 seconds (about 3.7 days) with 4 significant digits;
minimum unit is 1 second (however, 0.1 second for a setting of
4 seconds or shorter). 0.0 to 32000% can be set in H02.
( e.g. 12345% unacceptable, 12340% acceptable)

● Setting accuracy of velocity computation time: (±5.0% of set
value) ±1 second

Set the first-order lag 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 first-order lag time constant:

1.0 to 799.0 seconds; minimum unit is 0.1 second.
However, when not using the first-order lag function, set 0 sec­ond.

● Setting accuracy of first-order lag time constant :
(±5.0% of set value) ±1 second

L

2

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6.9 VJXS-J Linearizer (Optionally-set Line-segment
Function)

This computing unit gives an optional relationship between the input
(X) and output (output-1 = Y1, ouput-2 = Y2) signals using an option­ally-set line-segment function. The line-segment function has 21
breakpoints, which each gives an input-output relationship as a per­centage (%).
Set the number of line segments by 1 to 20.
Set the input (X) at % value in H01:CONST to H21:CONST, and the
output (Y) at % value in H22:CONST to H42:CONST.

● Setting condition of breakpoints:
For input: −6.0X0 (H01) to X20 (H21)106.0%; with 4 significant
digits, minimum unit is 0.01%
X0<X1<X2< ····· <X
For output: −6.0Y0 (H22) to Y20 (H42)106.0%; with 4 significant
digits, minimum unit is 0.01%
When input  X0 (H01), Y0 (H22) is output.
When input  final set value, the final set value of output is output.
Any number of line segments (1 to 20) can be set in H43.
The number of line segments 1 to 20 corresponds 100 to 2000%.

● Computation accuracy:
±0.1% (However, when line-segment gain is 1 or less.)

20

6.10 VJXS-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:

−32000 to 32000% with 4 significant digits; minimum unit is

0.001%.

● Computation accuracy:

±0.1% (However, when the ratio is 1 or less.)

NOTE

Decide ratio or bias so as not to exceed ±3.41038% during
computation. Ratio, bias and computation results are 4
significant digits.

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IM 77J01X11-01E 2nd Edition Nov 30,2005-00

7. LIST OF PARAMETERS

7.1 VJXS (except for the function suffix code “A”)

Parameter Display Item

MODEL
TAG NO
SELF CHK

A

DISPLAY1

A01

INPUT1

A05

OUTPUT1

A06

OUTPUT2

A54

STATUS

A56

REV NO

A58

MENU REV

A60

SELF CHK

B

DISPLAY2

B01

INPUT1

B05

OUTPUT1

B06

OUTPUT2

B60

SELF CHK

D

SET (I/O)

D01

TAG NO.1

D02

TAG NO.2

D03

COMMENT1

D04

COMMENT2

D20

INP TYPE

D22

IN RESIST

D27

INPUT1 L_RNG

D28

INPUT1 H_RNG

D38

OUT1 L_RNG

D39

OUT1 H_RNG

D40

OUT2 L_RNG

D41

OUT2 H_RNG

D44

PRGM SELECT

D60

SELF CHK

H

CONST

H01

CONST

H02

CONST

•

•

•

H58
H59
H60

P

P08
P09
P26
P27
P28
P29
P60

Q

Q03
Q04
Q60

*1: The displayed status is to let the service staff know the past records

of the product.

*2: There are items not displayed depending on what output-2 is

specified.

*3: The parameters are the items to be set at the factory.

•

•

•

CONST
CONST
SELF CHK

ADJUST

IN1 ZERO ADJ
IN1 SPAN ADJ
OUT1ZERO ADJ
OUT1SPAN ADJ
OUT2ZERO ADJ
OUT2SPAN ADJ
SELF CHK

TEST

OUT1 TEST
OUT2 TEST
SELF CHK

Model
Tag No.
Self-check result

Display 1

*2

Input-1
Output-1
Output-2

*1

Status
REV No.
MENU REV
Self-check result

Display 2

*2

Input-1
Output-1
Output-2
Self-check result

Setting (I/O)

*2

Tag No.-1
Tag No.-2
Comment-1
Comment-2
Input type
Input resistor

*3

*3

Input-1 low range
Input-1 high range
Output-1 low range
Output-1 high range
Output-2 low range
Output-2 high range
Program selection
Self-check result

Fixed Constant of Computing Unit

Fixed constant
Fixed constant

•

•

•

Fixed constant
Fixed constant
Self-check result

Adjustment

*2

Input-1 zero adjustment
Input-1 span adjustment
Output-1 zero adjustment
Output-1 span adjustment
Output-2 zero adjustment
Output-2 span adjustment
Self-check result

*2

Test

Forced output-1
Forced output-2
Self-check result

7.2 VJXS (for the function suffix code “A”)

Parameter Display Item

MODEL
TAG NO
SELF CHK

A

DISPLAY1

A01

INPUT1

A05

OUTPUT1

A06

OUTPUT2

A11

T1

A12

T2

A13

T3

A14

T4

A16

DO

A17

LOAD

A54

STATUS

A56

REV NO

A58

MENU REV

A60

SELF CHK

B

DISPLAY2

B01

INPUT1

B05

OUTPUT1

B06

OUTPUT2

B11

T1

B12

T2

B13

T3

B14

T4

B16

DO

B17

LOAD

B60

SELF CHK

D

SET (I/O)

D01

TAG NO.1

D02

TAG NO.2

D03

COMMENT1

D04

*3

*3

D20
D22
D27
D28
D38
D39
D40
D41
D44
D47
D60

G

G01
G02

G58
G59
G60

H

H01
H02

H58
H59
H60

P

P08
P09
P26
P27
P28
P29
P60

Q

Q03
Q04
Q60

•

•

•

•

•

•

COMMENT2
INP TYPE
IN RESIST
INPUT1 L_RNG
INPUT1 H_RNG
OUT1 L_RNG
OUT1 H_RNG
OUT2 L_RNG
OUT2 H_RNG
PRGM SELECT
CYCLE TIME
SELF CHK

PROGRAM

PROGRAM
PROGRAM

•

•

•

PROGRAM
PROGRAM
SELF CHK

CONST

CONST
CONST

•

•

•

CONST
CONST
SELF CHK

ADJUST

IN1 ZERO ADJ
IN1 SPAN ADJ
OUT1ZERO ADJ
OUT1SPAN ADJ
OUT2ZERO ADJ
OUT2SPAN ADJ
SELF CHK

TEST

OUT1 TEST
OUT2 TEST
SELF CHK

Model
Tag No.
Self-check result

Display 1

Input-1
Output-1
Output-2
Temporary memory-1
Temporary memory-2
Temporary memory-3
Temporary memory-4
Digital output
Load factor
Status
REV No.
MENU REV
Self-check result

Display 2

Input-1
Output-1
Output-2
Temporary memory-1
Temporary memory-2
Temporary memory-3
Temporary memory-4
Digital output
Load factor
Self-check result

Setting (I/O)

Tag No.-1
Tag No.-2
Comment-1
Comment-2
Input type
Input resistor
Input-1 low range
Input-1 high range
Output-1 low range
Output-1 high range
Output-2 low range
Output-2 high range
Program selection
Computation cycle
Self-check result

Program of Computing Unit

Program
Program

Program
Program
Self-check result

Fixed Constant of Computing Unit

Fixed constant
Fixed constant

Fixed constant
Fixed constant
Self-check result

Adjustment

Input-1 zero adjustment
Input-1 span adjustment
Output-1 zero adjustment
Output-1 span adjustment
Output-2 zero adjustment
Output-2 span adjustment
Self-check result

Test

Forced output-1
Forced output-2
Self-check result

*2

*1

*2

*2

*3

*3

*3

*3

•

•

•

•

•

•

*2

*2

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IM 77J01X11-01E 2nd Edition Nov 30,2005-00

8. 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.

8.1 Calibration Apparatus

● A DC voltage/current standard (Yokogawa 7651 or the equivalent)

● A digital multimeter (Yokogawa 7561 or the equivalent)

● A precision resistor of 250  ±0.01%, 1 W

● Setting tool for adjustment (Refer to “4.1 Connector for Communi-

cation” in this manual.)

8.2 Calibration Procedure

(1) Connect the instruments as shown below. First adjust the output-

1 signal and then the output-2 signal.

(2) Use the DC voltage/current standard and apply input signals

equivalent to 0, 25, 50, 75, and 100% of input span to the comput­ing unit.

(3) Check to see the output values obtained from the computation of

each input are within the specified accuracy rating. “R” is used for
current output.

● Use the setting tool (VJ77 Parameters Setting Tool or JHT200

Handy Terminal) to adjust the input/output signals.

Input Adjustment Procedure

(1) Input the value equivalent to 0% value of input range.
(2) Call the display item (A: DISPLAY1) to check the input value in

A01: INPUT1.

(3) If the adjustment is necessary, call the adjustment item (P: AD-

JUST).

(4) Select P08: IN1 ZERO ADJ to enter the adjustment mode. Select

EXECUTE (adjustment) for adjustment. (If RESET is selected,

the adjusted value is reset to the factory-set default.)
(5) Input the value equivalent to 100% value of input range.
(6) Call the display item (A: DISPLAY1) to check the input value in

A01: INPUT1.
(7) If the adjustment is necessary, call the adjustment item (P: AD-

JUST).
(8) Select P09: IN1 SPAN ADJ to enter the adjustment mode. Select

EXECUTE (adjustment) for adjustment. (If RESET is selected,

the adjusted value is reset to the factory-set default.)

Output Adjustment Procedure

(1) When adjusting 0% value of output-1, call the adjustment item (P:

ADJUST) to select P26: OUT1ZERO ADJ.
(2) If there is a positive deviation, correct it by setting a negative

value to offset the deviation. If there is a negative deviation, cor-

rect it by setting a positive value.
*: The 100% value of output-1 and 0% / 100% values of output-2

can be adjusted by the same operation as the above.

For adjustment using a setting tool, refer to the User’s Manual for

each setting tool and “7. List of Parameters” in this manual.

User’s Manual for VJ77 [Document No.: IM 77J01J77-01E]; how-

ever, use the VJ77 of version R1.04 or later.

User’s Manual for JHT200 [Document No.: IM JF81-02E]

Shunt resistor

(External receiving

resistor for

current input)

3 2

1

56

4

789

1011

Power supply

1110 8

N–

L+

GND

Input







Digital
multimeter





Digital
multimeter



1

R

3

DC voltge/
current
standard

R: Receiving resistor
for current input

Output-2

2

R

5

R: 250  precision resistor
for current output

Output-1

7

R

9

R: 250  precision resistor
for current output

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IM 77J01X11-01E 2nd Edition Nov 30,2005-00

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IM 77J01X11-01E 2nd Edition Nov 30,2005-00