KYOWA WGI-400A User guide

IM-A-685C April 2022
INSTRUMENTATION AMPLIFIER
With
MULTIPURPOSE INDICATOR
WGI-400A
INSTALLATION & SETUP MANUAL
Thank you for purchasing KYOWA’s product WGI-400A
Instrumentation Amplifier with Multipurpose Indicator.
Read this Instruction Manual carefully in order to make full use of the
high performance capabilities of the product.
Do not use the product in methods other than described in this Manual.
Copyright © KYOWA ELECTRONIC INSTRUMENTS CO., LTD. All rights reserved.
This Instruction Manual may not be copied or reproduced, in whole or part, without consent of KYOWA.
The Manual has been complied with great care. However, if the need should arise for more information, contact
KYOWA or our representatives.
The contents of the Manual are subjected to change without prior notice.

CONTENTS
SAFETY PRECAUTIONS.............................................................................................................................1
PRIOR TO USE ...................................................................................................................................................................1
SAFETY SYMBOLS............................................................................................................................................................1
STANDARD ACCESSORIES........................................................................................................................4
TYPES ............................................................................................................................................................4
OPERATIONAL RATING ............................................................................................................................4
1. PARTS NAMES AND FUNCTIONS.........................................................................................................5
1-1 FRONT PANEL .............................................................................................................................................................5
1-2 REAR PANEL................................................................................................................................................................6
2. CONNECTION ..........................................................................................................................................7
2-1 INSTALLING TO THE PANEL....................................................................................................................................7
2-2 WIRING .........................................................................................................................................................................8
2-2-1 Terminal Board .......................................................................................................................................................8
2-2-2 Connecting Power Supply.......................................................................................................................................8
2-2-3 Connecting Transducers .........................................................................................................................................8
2-2-4 Connecting Control Input Terminal .......................................................................................................................9
2-2-5 Connecting Control Output Terminal ....................................................................................................................9
2-2-6 Connecting Analog Output Terminal .....................................................................................................................9
2-2-7 Connecting BCD Output (Optional Function) .....................................................................................................10
2-2-8 Connecting RS Output (Optional Function) ........................................................................................................11
2-2-9 Connecting RS-485 Output (Optional Function) .................................................................................................12
3 SPECIFICATIONS ...................................................................................................................................13
3-1 SPECIFICATIONS ......................................................................................................................................................13
3-2 OUTSIDE DRAWING .................................................................................................................................................15

1
SAFETY PRECAUTIONS
PRIOR TO USE
This Manual describes detailed instructions for installing and setting up the WGI-400A Instrumentation
Amplifier with Multipurpose Indicator (hereinafter referred to as the WGI-400A).
For safe use of the WGI-400A, do not forget to read the “Safety Precautions” prior to use.
KYOWA ELECTRONIC INSTRUMENTS CO., LTD. assumes no liability for any damages resulting from
user’s failure to comply with the safety precautions.
SAFETY SYMBOLS
For safety operation of the WGI-400A, the following “WARNING” and “CAUTION” symbols are used in
“Safety Precautions” of this Instruction Manual.
WARNING
Improper operation of the system may result in death or severe injury of
the operator.
CAUTION
Improper operation of the system may result in injury of the operator and
physical damage of the system.
In addition, items in CAUTION may lead to serious consequences. Take special attention to the
Safety Symbols.
The following symbols are used in the WGI-400A to call operator’s attention when operating the product.
Safety Symbols used in the WGI-400A.
WARNING
Indicates “Handling Precautions.” This symbol is attached to the
WGI-400A when it requires to refer to the Instruction Manual for securing
safety of the operator and the product.
CAUTION
Indicates “Protective Ground Terminal.” Always connect to ground before
operating the product.

2
WARNING
1) If the potential secondary damage generates in the System due to deterioration of the WGI-400A,
always adopt another proper technical measures for safety.
Or, trouble may occur caused by erroneous output or malfunction of the instrument.
2) Installation and wiring work should be conducted more than 3 seconds after the power is cutoff.
Or, electric shock hazard or damage of the product may result.
3) Do not forget to put a cover on the terminal board.
Or, electric shock hazard may result.
4) Special care should be taken not to use the WGI-400A in environment with inflammable gas or
vapor
Or, fire hazard may result.
5) If the WGI-400A is faulty, emitting smoke or offensive odor, or producing abnormal sound,
immediately turn OFF the power.
Or, electric shock or fire hazard may result.
Contact KYOWA’s representatives for repair.
6) Do not put water or foreign matters into the WGI-400A. In case if any foreign matters are entered,
immediately turn OFF the power.
Or, electric shock or fire hazard may result.
Contact KYOWA’s representatives for repair.
7) If the power cable is damaged, turn OFF the power and replace the cable with a new one.
Or, electric shock or fire hazard may result.
8) Always operate the WGI-400A with power voltage specified in this Instruction Manual.
Or, electric shock or fire hazard may result.
9) Do not operate the WGI-400A in environment with excessive moisture, dust or oil dust.
Or, electric shock or fire hazard may result.
10)Do not disassemble the WGI-400A.
Or, deterioration or malfunction of the instrument may result.
11)When it started thundering, do not touch the WGI-400A or cables.
Or, electric shock hazard may result.
12)Always connect the protective ground wire to the protective ground terminal.
Or, electric shock hazard or malfunction of the instrument may result.
13)In order to assuredly and immediately cut off the power when failure occurred in the system or in
WGI-400A, mount an external breaker, etc.

3
CAUTION
1) Before wiring, always confirm the rated power voltage of the WGI-400A and terminal arrangement.
Then, conduct wiring in the correct manner.
2) Power consumption of the WGI-400A is maximum 6 VA. If it is unavoidably operated in
environment with poor power condition, it is recommended to use an insulated constant voltage
transformer or the like.
3) Special care should be taken when using the WGI-400A in environment with excessive vibration. If
the WGI-400A is operated at a location with excessive vibration or with continuous vibration, it
may cause measurement error and/or failure of the instrument.
Take care not to drop it during transportation and avoid applying strong impact.
Or, deterioration of the instrument may result.
4) Basically, the WGI-400A is designed to be used by connecting a strain gage transducer to the input
terminal. Do not use transducers other than the above or deterioration of the instrument may result.
5) Before cleaning the panel, always turn OFF the WGI-400A and gently clean with a soft cloth. Do
not use paint thinner, benzine, acetone, kerosene or the like.
6) Operate the WGI-400A by conforming to operating environment specified in this Instruction
Manual.
Or, malfunction and/or failure of the instrument may result.

4
The WGI-400A is an Instrumentation Amplifier with multipurpose indicator that measures and displays load,
weight, pressure, displacement, etc. in physical values by connecting to various strain gage transducers such as
load cells, pressure meters, displacement meters, etc.
STANDARD ACCESSORIES
The following accessories are enclosed with the WGI-400A. After unpacking, check all the accessories are
correctly prepared.
Unit seal .....................................................................................1
Product Warranty .......................................................................1
Instruction Manual .....................................................................1
Installation & Setup Manual ......................................................1
Reference: Power cable is not included in the accessories. Customers are required to purchase the power cable
compatible for your power supply environment.
Optionals: AC power cable for 100 VAC: P-23 and AC power cable for 200 VAC: P-28
TYPES
The WGI-400A has the following types according to optional functions.
Model Name No Optionals BCD Output RS-232C RS-485 AC Power Supply DC Power Supply
WGI-400A-00 ○○
WGI-400A-01 ○○
WGI-400A-02 ○○
WGI-400A-03 ○○
WGI-400A-10 ○○
WGI-400A-11 ○○
WGI-400A-12 ○○
WGI-400A-13 ○○
OPERATIONAL RATING
Operational rating and operating environment of the WGI-400A are described in Chapter 3.
SPECIFICATIONS.
Always use the WGI-400A within the range of specifications.

5
1. PARTS NAMES AND FUNCTIONS
1-1 FRONT PANEL
1) Indicator ....................................• Displays measured value, various selected functions, and set values.
• Normally, it is displayed with measured value according to the output
from transducers. However, if error occurs, error message appears.
2) Unit Label ..................................• Select the desired unit from the accessory unit label sheet and attach it
on this portion.
3) [LOCK] LED .............................• When this [LOCK] LED is lit or flickering, no functions are set. Always
turn OFF the [LOCK] LED before setting functions.
• However, high/low limit value is displayed even when the [LOCK] LED
lit.
4) [HIGH] Limit LED ....................• Lights up when the measured value exceeds the high limit value.
• Flickers when the high limit value is displayed.
5) [OK] LED ..................................• Flickers when the measured value exceeds the low limit value or lowers
the high limit value.
6) [LOW] Limit LED .....................• Lights up when the measured value is less than the low limit value.
Flickers when the low limit value is displayed.
7) Operation Key .............................• A pushbutton switch to operate the WGI-400A.
One key is used together for multiple functions that are automatically
switched according to measuring or setting states.
8) Status Indicator............................• In the measuring state, pattern No. is displayed.
• During calibration, minimum-digit numeric value of rated capacity is
displayed.
1)
2)
3
)
4) 5) 6)
7) 8
)

6
1-2 REAR PANEL
1) Optional Function: Location of connectors BCD, RS232C, and RS485
2) Connection Terminals of Transducers (Transducer and TEDS)
A: Bridge excitation(+) Red wire
B: Bridge output (-) White wire
C: Bridge excitation(-) Black wire
D: Bridge output (+) Green wire
E : Shield
+ : TEDS (+)
- : TEDS (-)
3) Analog Output Terminal (ANALOG OUT)
COM : Common
V: Voltage output terminal
I : Current output terminal
4) Control Output Terminal (OUTPUT) 5) Control Input Terminal (INPUT)
COM: Common COM: Common
1 : High limit output (HIGH) 1 : Digital Zero command
2 : OK output (OK) 2 : Level test command
3 : Low limit output (LOW) 3 : Pattern select command 1
4 : Pattern select command 2
6) Power Input Terminal (POWER)
GND: Ground terminal
N: Power supply input terminal
L : Power supply input terminal
+ : +Power supply input terminal
- : -Power supply input terminal
7) Fitting Metal Used for fixing the WGI-400A to the panel.
1)
2
)
3
)
4)
ＶＩ A B C D Ｅ + -
Ｎ Ｌ １２３
Ｇ
Ｎ
Ｄ
Ｃ
Ｏ
Ｍ
Ｃ
Ｏ
Ｍ
Ｃ
Ｏ
Ｍ
１２３４
6)
（＋ －）
5)
7
)
7)
KYOWA’s standard wire colors
Connect AC power supply.
Connect DC power supply. (When DC is optionally set.)

7
2. CONNECTION
2-1 INSTALLING TO THE PANEL
To install the WGI-400A to the panel, prepare a panel
according to the specified panel cut dimensions as shown
at the right. Then, install theWGI-400A by referring to the
following procedures.
1) Cut out the panel by referring to the panel cut
dimensions.
2) Remove screws of the fitting metals attached on
both sides of the WGI-400A and then, pull out the
fitting metal.
3) Set the WGI-400A into the panel frame.
4) Set the fitting metals on both sides of the
WGI-400A.
5) Tighten the screws and firmly fix the WGI-400A.
92.2+0.4
0
45.2+0.4
Plate thickness: 0.8 to 5.0
0
120
70
Panel cut position for mounting multiple WGI-400A
Panel cut dimensions

8
2-2 WIRING
Check terminal Nos. on the rear panel described on Page 6 and correctly wire the cables.
2-2-1 Terminal Board
• Remove the cover from the terminal board before conducting required wirings.
• It is recommended to attach press-fit terminals to the connecting wires.
Use the press fit terminals having the size equivalent to 1.25-3.
• After completing wirings to the terminal board, do not forget to put a cover on the terminal board.
2-2-2 Connecting Power Supply
• Do not forget to check that power voltage is from 100 to 240 VAC (±10%) and use the cable with pressure
proof capacity having more than power supply voltage.
• For DC power supply (Optional), check the DC voltage is from 10 to 30 VDC (8W).
Note: Although the WGI-400A may be operated with power supply voltage exceeding the
allowable power voltage range, the operation may not be guaranteed Always use the
WGI-400A within the specified power voltage range.
Note: Control input/output and analog output terminals has a tightening torque of 0.5 N･m or
less.
2-2-3 Connecting Transducers
• Connect transducers to terminals A to E as described in the following.
(Cable colors are KYOWA’s standard color codes.)
A: Bridge excitation + side (Red)
B: Bridge output - side (White)
C: Bridge excitation - side (Black)
D: Bridge output + side (Green)
E: Shield
+: TEDS (+)
-: TEDS (-)
Note: Do not connect the power cable to the TEDS terminal.
• Use as short as possible 4-conductor shield cable (TEDS: 6-conductor cable) for transducer wiring.
In addition, locate the transducer far apart from power lines and wirings interfered with noise.

9
2-2-4 Connecting Control Input Terminal
• Connection of control input terminal (INPUT)
is described in the following.
COM: Common
1: Digital command
2: Level test command
3: Pattern select command 1
4: Pattern select command 2
• When using the external switch, connect as shown in
the right figure. In addition, connect the open
collector in the same manner.
2-2-5 Connecting Control Output Terminal
• Connection of control output terminal (OUTPUT)
is described in the following.
COM: Common
1: High limit output (HIGH)
2: OK output (OK)
3: Low limit output (LOW)
• Connect by referring to the right figure.
2-2-6 Connecting Analog Output Terminal
• Connection of analog output terminal (ANALOG
OUTPUT) is described in the following.
COM: Common
V: Voltage output terminal (±10 V)
I: Current output terminal (4 to 20 mA)
• Always set the current output to load resistance 500 Ωor less and voltage output to 2 kΩor more.
Reference: Countermeasures against noise for control input/output and analog output terminals
• For more than 1-m long wiring, use twisted cable.
• For more than 3-m long wiring, use 2-conductor shield cable and connect the shield cable to
the ground terminal.
Note: Control input/output and analog output terminals has a tightening torque of 0.5 N･m
or less.
Input Connection Diagram
External
Internal
12V
Switch or open
collector
2.4 KΩ
1 to 5 mA→
Output Connection Diagram
30 Vmax
COM
External
Internal
10KΩ

10
2-2-7 Connecting BCD Output (Optional Function)
When using BCD output equipped WGI-400A-01 (or WGI-400A-11).
Pin No. and Signal Name (Connector and Cable)
Aside(Cable) Bside(Cable)
No. Signal Name No. Signal Name Cable Color
A1１Data 1 B1 Data 2 Red
A2 Data 4 B2 Data 8 Gray
A3 Data 10 B3 Data 20 Gray
A4 Data 40 B4 Data 80 Gray
A5 Data 100 B5 Data 200 Green
A6 Data 400 B6 Data 800 Gray
A7 Data 1000 B7 Data 2000 Gray
A8 Data 4000 B8 Data 8000 Gray
A9 POL (- Polarity) B9 OVER Gray
A10 EOC (End of Conversion) B10 ENABLE (Output prohibited) Green
A11 N.EOC (EOC logic reverse) B11 (Connection prohibited) Gray
A12 (Connection prohibited) B12 (Connection prohibited) Gray
A13 (Connection prohibited) B13 (Connection prohibited) Gray
A14 (Connection prohibited) B14 (Connection prohibited) Gray
A15 (Connection prohibited) B15 (Connection prohibited) Green
A16 (Connection prohibited) B16 (Connection prohibited) Gray
A17 COM B17 COM Gray
A18 COM B18 COM Gray
Equivalent circuit of signals shall be equivalent with control output. However, ENABLE (Output prohibit) is
equivalent with control input.
Note: (1) Connection prohibited terminals are used for adjusting the product on KYOWA’s side. Do not
connect anything on the customers’ side.
(2) Cable colors described in the above table are in the case when the accessory ‘BCD output cable for
WGI-400A N-43’ is used.
Compatible connector: Equivalent to 8822E-036-171-F (KEL CORP. made)
Accessory: BCD output cable for WGI-400A N-43
Cable length 2 m, Cutoff at the end
▼
First Pin

11
2-2-8 Connecting RS Output (Optional Function)
When using RS-232C interface equipped WGI-400A-02 and WGI-400A-12.
1) Connector Pin and Signal Name
Pin No. Signal Name
1 N.C.
2 RXD (Receive Data)
3 TXD (Transmit Data)
4 N.C.
5 SG
6 N.C.
7 CTS (Clear To Send)
8 RTS (Request To Send)
9 N.C.
2) Signal Specifications
Transmission speed: 9600 bps Receive delimiter: CR
Data bit: 7 bits Transmit delimiter: CR + LF
Parity bit: Odd number parity
Stop bit: 1 bit
Output code: ASCII
The above settings are default values.
3) Connecting to External Devices
(1) Connection
For connecting external devices to the PC, use commercially available RS cross cable (reversible type).
N.C. 1 1 DCD
RXD(Receive Data）22RXD
TXD（Transmit Data）33TXD
N.C. 4 4 DTR
SG 5 5 SG
N.C. 6 6 DSR
CTS（Clear To Send）77CTS
RTS（RequestToSend）88RTS
N.C. 9 9 RI
PC sideWGI side
Note: Do not forget to turn OFF both the WGI-400A and external device before connecting to the PC.
Or, the WGI-400A may not operate correctly or cause damage.
(2) Setting External Devices
Set external devices by referring to the WGI-400A signal specifications.
Note:The WGI-400A is not compatible with XON/XOFF control and send brake signal.
Pin type (male)
Front view of the RS-232C connector
(D-sub connector) on the rear panel.

12
2-2-9 Connecting RS-485 Output (Optional Function)
When using RS-485 interface equipped WGI-400-03 and WGI-400-13.
Various functions can be set as well as measured values can be read from external devices.
1) Connector Pins and Signal Names
Pin No. Signal Name
1 +(Non-reversing output)
2 +(Non-reversing output)
3 - (Reversing output)
4 - (Reversing output)
5 SG
6 Terminator
7 N.C.
8 N.C.
9 Terminator
2) Signal Specifications
Transmission speed: 9600 bps Receive delimiter: CR
Data bit: 7 bits Transmit delimiter: CR + LF
Parity bit: Odd number parity
Stop bit: 1 bit
Output code: ASCII
The above settings are default values.
3) Connecting to External Devices
(1) Connection
• For connecting external devices to the PC, use RS-485 ↔RS-232C converter (Following is a
recommended converter).
• Short-circuit connector pins Nos. 6 and 9. Then, terminating resistance applied state is obtained.
• Set the converter switch to DTE.
• Pin Nos. 1 and 2 as well as 3 and 4 are the same functions. Correctly connect the wires.
PC side
+(Nonreverse output) 1 Converter
+(Nonreverse output) 2SD/RD+
-(Nonreverse output) 3 SD/RD-
-(Nonreverse output) 4GND
SG 5 RS-232C
Terminator 6
N.C. 7 Short
N.C. 8
Terminator 9
WGI side
Recommended converter: SI-30 (RS-485 ↔RS-232C converter) LINEEYE CORP. made
Note: Do not forget to turn OFF both WGI-400A and external devices before connecting to the PC.
Or, the WGI-400A may not operate correctly or cause damage.
Pin type (male)
Front view of the RS-485 connector
(D-sub connector) on the rear panel.

13
3 SPECIFICATIONS
3-1 SPECIFICATIONS
Model Name .......................................... WGI-400A Instrumentation Amplifier with Multipurpose Indicator
The Number of Measuring Channels ......1
Compatible Sensor .................................Strain Gage Transducer
Compatible Bridge Resistor ...................87.5 to 1000 Ω(350 Ω4 units parallel connection available)
Bridge Excitation Voltage ......................2 VDC (Max 30 mA)/4 VDC (Max 50 mA) selectable
Measuring Range ...................................±3.2 mV/V (Zero adjusting range included)
Sampling Speed .....................................50 times/second
Resolution ..............................................64000 count/input range in both polarities
Calibration functions ...............................Actual load calibration, Sensitivity-registered calibration,
Numericalvalue-registeredcalibration
Display……………………………………... Display range:±9999
Character Height: 14 mm, Red LED
Display Speed: 50 times/sec
Decimal Point………………………………Put to anywhere possible
Zero Adjustment Functions ......................Any value in the input range is set to digital zero,
Execution by key operation or external contact signal
Smoothing Function ...............................Minimum scale: 1, 2, 5, 10, 20, 50, and 100 counts
Moving average: 2, 4, 8, 16, 32, 64, and 128 times
Auto Zero Compensation Function........... Zero tracking (Auto digital Zero within the setting range)
Zero Near Zero (Auto Zero display)
Additional Function ...............................Setting range: ±9999
Original Value Display Function ............±3.200 mV/V
Level Test Function ................................Can display arbitrary value
Temperature Stability Zero point: Within ±0.5 μVRTI/°C
Sensitivity: Within ±0.01%/°C
Non-linearity .........................................Within ±(0.1% FS +1 digit)
Control Input .........................................The number of points: 4
Zero command, Level test command, Pattern select command 1,
and Pattern select command 2
Signal capacity: 12 VDC, 5 mA or more
Inputmode: Opencollector(NPN)or
non-voltage contact signal

14
Control Output .......................................The number of points: 3 (HIGH, OK, and LOW)
Output mode: Open collector (NPN)
Load capacity: 30 VDC, 20 mA (Resistance load)
Pattern function: Set 4 sets of high/low limit value,
Selectable from external signal
High/Low limit comparator function:
The number of points:2 (HGH and LOW)
Setting range: ±9999
Comparison speed: 50 times/sec
Detector function:
The number of point: 1 (OK)
Analog Output .......................................Select voltage output or current output
Voltage output: ±10 V (Load resistance 2k ohm or more)
Arbitrarily scaling available
Current output: 4 to 20 mA (Load resistance 500 ohm or
less)
Arbitrarily scaling available
Response speed: Approx. 0.25 sec (10 to 90%)
Non-linearity: Within ±0.1% FS
Frequency response: Approx. 1 Hz (-3dB±1dB)
TEDS Function ......................................Automatic sensitivity registration (Key operation, When power
ON, RS control)
Power Supply .........................................AC power supply: 100 to 240 VAC , 50/60 Hz
Power consumption 6 VA or less
DC power supply: 10 to 30 VDC
Power consumption 8 W or less
Operating Temperature and
Humidity Range …..…………...-10 to 50 °C, 20 to 85% (Non-condensing)
Dimensions ............................................96(W) × 48(H) × 144(D) mm
Panel cut dimensions……………………….92.2 (W) × 45.2 (H) mm,
Panel thickness 0.8 to 5.0 mm recommend
Weight ...................................................Approx. 300 g (Standard type)
Accessories..............................................Unit seal, Instruction manual, Product warranty
Compliance..............................................Directive 2014/30/EU (EMC)
Directive 2014/35/EU (LVD)
Directive 2011/65/EU, (EU)2015/863
(10 restricted substances) (RoHS)
0
+0.4 +0.4
0

15
+0.4
-0
+0.4
-0
隣に実装する時は、中心間の距離を最低１２０ｍｍ
上下に実装するときは、中心間の距離を最低７０ｍｍ
あけること。
パネルカット寸法
(135)
(144)
7
92 96
48
45
92.2
45.2
3-2 OUTSIDE DRAWING
1) Standard model with no optionals.
Panel cut dimensions
When mounting multiple WGI-400A units, keep at least 120-mm distance between centers of the next located panels and at least 70-mm distance between centers of the above and below located panels.

16