KYOWA WGA-680A Series User manual

IM-A-1048H April 2019
INSTRUCTION MANUAL
WGA-680A
INSTRUMENTATION AMPLIFIER
Thank you for purchasing KYOWA’s product WGA-680A Instrumentation
Amplifier.
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.
Generally, company names and trade names described in this Instruction Manual are trademarks or registered
trademarks of the companies.
This Instruction Manual may not be copied or reproduced, in whole or part, without consent of KYOWA.
Copyright © Kyowa Electronic Instruments Co., Ltd. All rights reserved.
The contents of the Instruction Manual are subjected to change without prior notice.
We assume no responsibility whatever for any damage resulting from the use of this product.

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CONTENTS
CONTENTS
STANDARD ACCESSORIES
OPTIONAL ACCESSORIES
SAFETY PRECAUTIONS (Do not forget to read the safety precautions prior to use.)
LIMITED LIDE PARTS AND PREVENTIVE MAINTENANCE
WGA-680A REPLACEMENT BEFORE THE END OF SERVICE LIFE
NOTATIONS USED IN THE INSTRUCTION MANUAL
IMPORTANT PRECAUTIONS WHEN USING WGA-680A
PRECAUTIONS ON CE MARKING
1. OUTLINE OF PRODUCT
1-1. OUTLINE
1-2. FEATURES
1-3. MODEL
2. CONTROLS AND FUNCTIONS
2-1. FRONT PANEL
2-2. REAR PANEL
3. CONNECTION AND DEFAULT SETTING
3-1. PROCEDURES FOR MEASUREMENTS
3-2. TO MOUNT THE WGA-680A ON THE PANEL
3-3. TO CONNECT TRANSDUCERS
3-3-1. Terminal blocks
3-3-2. To connect transducers
3-4. TO CONNECT [INPUT] TERMINALS
3-5. TO CONNECT [OUTPUT] TERMINALS
3-6. TO CONNECT [ANALOG OUTPUT] TERMINALS
3-7. TO CONNECT POWER SUPPLY
3-7-1.WGA-680A-00~04 (AC models)
3-7-2.WGA-680A-10~14 (DC models)
4. OPERATIONS AND FUNCTIONS
4-1.KEY OPERATIONS
4-1-1. Lock function
4-1-2. Key operations in MEASURING mode
4-1-3. Key operations in FUNCTION SELECTING mode
4-1-4. Key operations in SETTING mode
4-2. TO SELECT BRIDGE EXCITATION VOLTAGE
4-3. DIGITAL ZERO FUNCTION
4-4. CALIBRATION FUNCTION
4-4-1. Actual load calibration
4-4-2. Sensitivity registering calibration
4-4-3. Numeric value registering calibration
4-5. COMPARATOR FUNCTIONS
4-5-1. Output for [HH]/[HI]/[LO]/[LL] comparator conditions
4-5-2. To set the [HH] limit value and [HI] limit value
4-5-3. To set the [LL] limit value and [LO] limit value
4-5-4. To set the hysteresis
4-5-5. To assign comparators
4-6. PATTERN FUNCTION
4-7. LEVEL TEST FUNCTION
4-8. UPDATING RATE OF DISPLAYING VALUES

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4-9. DISPLAY STABILITY FUNVTION
4-10. HOLD FUNCTIONS
4-10-1. Arbitrary point hold
4-10-2. Peak hold, bottom hold
4-10-3. Peak-to-peak hold (amplitude hold)
4-10-4. Interval-specified peak hold, interval-specified bottom hold, interval-specified peak-to-peak hold
4-10-5. Time-specified peak hold, Time-specified bottom hold, Time-specified peak-to-peak hold
4-11. ANALOG OUTPUT (D/A) FUNCTION
4-12. LIST OF FUNCTIONS
4-12-1. Various functions in FUNCTION SELECTING mode
4-12-2. Error codes
4-12-3. Table of functions
5. OPERATION TIMING
5-1. CONTROL INPUT SIGNALS (HOLD COMMAND, RESET COMMAND, ZERO COMMAND)
5-2. COMPARATOR OUTPUTS
5-3. DELAY TIME BETWEEN INPUT AND OUTPUT SIGNALS
6. TROUBLE SHOOTING
7. MAINTENANCE
8. SPECIFICATIONS
9. OUTSIDE DRAWING
9-1.WGA-680A -00: No option (AC model)
9-2.WGA-680A -10: No option (DC model)

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This Manual describes the WGA-680A Instrumentation Amplifier (hereinafter referred to as the WGA-680A).
STANDARD ACCESSORIES
The following accessories are packed with the WGA-680A.
When unpacking, check the contents to ensure that all accessories are enclosed.
Instruction Manual 1 (CD-R)
(For WGA-680A, For BCD/RS-232C/RS-485/TEDS, For CC-Link)
Product Warranty 1 each
Unit label 1
Flat-head screw driver for control input/output terminal blocks 1
OPTIONAL ACCESSORIES
100-VAC power cable (length: 2 m) P-23
200-VAC power cable (length: 2 m) P-28
6-conductor NDIS connector input cable U-29 to U-32
4-conductor NDIS connector input cable U-33 to U-36

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SAFETY PRECAUTIONS (Do not forget to read the safety precautions prior to use.)
The WGA-680A is designed to be used according to "8. SPECIFICATIONS". Do not use the product in an
environment exceeding the specifications. Or, it may cause troubles.
PRIOR TO USE
For safe use of the product, do not forget to read the "SAFETY PRECAUTIONS" prior to use.
KYOWA assumes no liability for any damage resulting from the user's failure to comply with the safety
precautions.
For safety operation of the product, the following symbol marks are used in the Instruction Manual.
Indicates "PROTECTIVE GROUND TERMINAL".
Be sure to connect the GND terminal to the ground.
SAFETY SYMBOLS
For safety operation of the product, the following symbol marks are used in the 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.
WARNING
Warning
Be sure to observe the safety precautions described in the WGA-680A Instruction Manual.
Power supply
To prevent a fire hazard, ensure that the power supply voltage specified for the product matches the local
line voltage before connecting the system to the power supply.
The power supply voltages are described in following.
WGA-680A-00~04 (AC models) :AC100~240V, Power consumption: 20VA or less
WGA-680A-10~14 (DC models) :DC10~30V, Power consumption: 10W or less
Avoid using in environment with inflammable gas, etc.
To prevent the risk of fire hazard or explosion, do not use the product in environment with inflammable
gas, vapor, or dust.
If any trouble occurs
To prevent a fire hazards, if smoke is emerging from the product, immediately disconnect the USB cable
or AC adapter to terminate the system operation.
Protective ground
Be sure to connect the GND terminal to the ground. Or, it may cause an electric shock hazard, lower the
performance, and cause trouble.

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CAUTION
Caution
Be sure to observe the safety precautions described in the WGA-680A Instruction Manual.
Do not use the product outdoors.
Or, it may cause electric shock, fire hazard, lower the performance and cause troubles.
Do not turn ON the power switch immediately after turning it OFF.
After turning OFF the power switch, wait (5 seconds) until the power supply is shut OFF before turning
ON the power switch again.
If the power is repeatedly turned ON and OFF within 5 seconds, rush current generated by switching the
power ON may damage the product.
Use the product within temperature ranging from -10 to +50 .
Use at temperatures exceeding the specified range may lower the performance and cause trouble.
If use under direct sunlight or in a cold place is inevitable, prepare a sunscreen or take proper measures to
keep it warm.
Use the product in the specified operating humidity of 20 to 80% RH.
Use in a humid place exceeding the specified range or where it is exposed to splashing water may lower
the performance and cause trouble.
Do not use the product immediately after the change in the environment.
Leave the product as it is until it becomes adaptable to the environment.
Abrupt change in ambient temperature due to transportation, etc. may cause dew condensation, which may
result in lower performance and troubles.
Use the product under environment without excessive vibration or high impact.
Vibration resistance: 19.6m/s
2
(2G), 10 to 200Hz (when in operation)
Use the product in an area where vibration and impact can be kept within the scope of specifications.
Continuous vibration or severe impact may cause deteriorated performance and system failure.
Do not use the product in strong electromagnetic field.
Use the product in a magnetic field environment where the PC may be used.
Performance may be lowered and erroneous operation and troubles may result if it is used near a telemetry
system, microwave oven, electronic furnace or any other equipment generating a strong magnetic field.
Do not use the product under poor conditions.
Operate the product within the range of power supply specs. The power supply used for the product should
not experience an instantaneous power failure and be free from noise.
Do not pull cords and cables.
Lay cords and cables with a certain allowance so that unreasonable force is not applied to the connections.
Or, it may interrupt the measurements, break the cables, and damage the connectors.
Avoid installing sensors and products near a welding machine. Failure to do so will pose the risk of
erroneous data, malfunction and failure.
Do not disassemble or remodel the product. Or, it may cause electric shock hazards or damage the product.
This warranty does not cover any damaged or defective parts that results from disassembling or
remodeling.
Do not use or strage the product under dusty or fine particles or corrosive gas environment.
Use or strage under these environment, may result in lower performance and troubles.
Do not expose the product to the air if it is used and stored nearby sea. Air exposure nearby sea may cause
lower performance and products failure.
Take care when handling the CD-R.
Do not expose the CD-R to direct sun light, high temperature, or high humidity.
Do not apply pressure to the CD-R by laying object or bending.
Dust, scratches, and fingerprints on either side of the CD-R can cause write errors.
Preheat the product before use.
After the power ON, always preheat the product for approximately 1 hour.
Cleaning.
When the product gets dirty, clean the product with a dry soft cloth. When dust exists inside the
WGA-680A, clean it by using an air blow gun. Do not touch electronic parts.

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Reference items required when handling the product.
Essential precautions required when handling the product.
LIMITED LIDE PARTS AND PREVENTIVE MAINTENANCE
The product consists of various electronic components and those components, if not all, have a useful life.
Using them exceeding the years specified according to each part type (useful life) may affect the characteristics of
the product, resulting in a malfunction or a failure.
Limited life parts used with the product are as follows.
The signal-noise ratio will lower due to capacity low or smoke will be emitted due to liquid leak, resulting in a
malfunction of the product.
To operate the product normally, finding a sign of the product failure early by daily/periodic inspections and
taking the corrective action are required. For inspection, contact KYOWA or our representatives.
* Limited life parts used with the product are aluminum electrolytic capacitor.
* All components do age and will fail.
WGA-680A REPLACEMENT BEFORE THE END OF SERVICE LIFE
Preventive maintenance and replacement parts are a cost-effective way of keeping the performance and extending
the service life of the product. Regardless of the replacement parts, the product itself gradually deteriorates with
age. Before the expected service life is reached, consider replacing the product with a new one or the latest series
as preventive maintenance.
NOTATIONS USED IN THE INSTRUCTION MANUAL
The following notations are used in the Instruction Manual for convenience.
Names described on the panel surface
Names described on the panel surface are expressed in double quotation mark " ".
Informational notes
Certain notations are used as necessary to attract your attention to information that requires special care when
handing the product, and to information provided for reference purposes.
Examples of Notations
NOTE
MEMO

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The output signal (voltage/current) when the transducer cable is broken.
When the transducer cable is broken, the WGA-680A may output the following output signal
(voltage/current). Therefore, take countermeasures to avoid the adverse effect, from the output signals,
on the other measuring instruments.
Output signal (voltage): Approx. -13 V
Output signal (current): Approx. 0 mA
The output signal (voltage/current) and unbalance load
Be sure to mount the product on the control panel, etc. Before turning ON the power, make sure the
product is covered to avoid contact with hands.
The product connection should be executed by experts in electrical work.
To immediately turn OFF the product, place switches or circuit breakers inside the building and near the
product and display the functions as well.
Use switches and circuit breakers conforming to the IEC60947-1 and IEC60947-3.
Use the product in area where elevation is 2000 m or below.
When mounting the product in your system, approaches to satisfy the CE marking requirements vary
with the configuration of the control panel to be used, the other devices to be connected, and wirings.
Therefore, customers are required to check whether the CE marking requirements on the product are
satisfied or not.
Use shielded cables as input cables, output cables and control cables.
Wiring should be 30 m or less.
Before connecting the control cables, be sure to mount ferrite core near the terminal.
Recommended ferrite core GRFC-5 (KITAGAWA INDUSTRIES CO., LTD.)
Be sure to connect the GND terminal to the ground by using the optional ground wire.
IMPORTANT PRECAUTIONS WHEN USING WGA-680A
PRECAUTIONS ON CE MARKING
NOTE
NOTE

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1. OUTLINE OF PRODUCT
1-1. OUTLINE
The WGA-680A Instrumentation Amplifier is a high-speed and sophisticated amplifier, designed to be used for
displaying physical quantities (load, etc.) with strain gage transducers.
The WGA-680A is able to be operated from the keys on the front panel, and includes various functions
(comparator functions, hold functions, D/A conversion functions, etc.) as standard equipment.
The WGA-680A is applicable for wide range of measurements and controlling functions: high-speed
phenomenon measurements to be required for high-speed sampling such as press-fitting and pressing, or load
measurement to be required for high-resolution.
The WGA-680A has the optional models; BCD/TEDS model, RS-232C/TEDS model, RS-485/TEDS model, and
CC-Link model. The CC-Link model is able to be controlled by PLC.
1-2. FEATURES
LEDs Numerical values and the comparator lights up in red, green, and orange, dependently on the status.
High-speed sampling : 4000 times/sec.
High-speed D/A conversion : 4000 times/sec.
Equips with 4 comparators.
HH comparator, HI comparator, LO comparator, LL comparator
Each comparator selects the "High limit" or "Low limit".
Saves 4 patterns of comparator value, and switches them.
Various hold functions:
Arbitrary point hold, peak hold, bottom hold, peak-to-peak hold
Indicated value: -99999 to 99999 (5 digits)
3 calibration functions:
Actual load calibration, Sensitivity registering calibration, Numeric value registering calibration
Various optional models:
BCD/TEDS model, RS-232C/TEDS model, RS-485/TEDS model, CC-Link model
1-3. MODEL
The WGA-680A series has 8 models. Customers are required to purchase the power cable applied for your power supply
specifications.
Model Option Power supply specs
WGA-680A-00 None AC models
Power supply AC100 to 240V
frequency 50/60Hz
Power consumption
20VA or less
WGA-680A-01 BCD/TEDS
WGA-680A-02 RS-232C/TEDS
WGA-680A-03 RS-485/TEDS
WGA-680A-04 CC-Link
WGA-680A-10 None DC models
Power supply DC10 to 30V
Power consumption
10W or less
WGA-680A-11 BCD/TEDS
WGA-680A-12 RS-232C/TEDS
WGA-680A-13 RS-485/TEDS
WGA-680A-14 CC-Link

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When the comparator function of [LL (LO)] comparator is “High limit” and the measured value is the [LL (LO)]
limit value or more, the LED lights up. For details, see”4-5-5. COMPARATOR FUNCTIONS”.
2. CONTROLS AND FUNCTIONS
2-1. FRONT PANEL
(1) Indicator Measured values, various selected functions, and pre-set values is displayed.
Normally, the measured value responding to the output from transducers is
displayed. However, if error occurs, error message is displayed. For details, see
"4-12-2. Error codes".
(2) Unit Label Select the desired unit from the accessory unit label sheet and attach it on this
portion.
(3) [LOCK] LED When the [LOCK] LED is ON or flickering, you are not able to set various
functions. Always turn OFF the [LOCK] LED before setting functions.
However, you are able to display the [HH]/[HI]/[LO]/[LL] limit values while the
[LOCK] LED is ON.
(4) [HOLD] LED Displays the detecting interval status and holding interval status in the various
HOLD modes. For details, see”4-9. HOLD FUNCTIONS”.
(5) [HH] LED
(Comparator-3 LED)
Lights up when the measured value is [HH] limit value or more.
Flickers when the [HH] limit value is displayed.
(6) [HI] LED
(Comparator-1 LED)
Lights up when the measured value is [HI] limit value or more.
Flickers when the [HI] limit value is displayed.
(7) [OK] LED Lights up when the measured value exceeds the [LL]/[LO] limit value and
lowers the[HH]/[HI] limit value.
(8) [LO] LED
(Comparator-2 LED)
Lights up when the measured value is [LO] limit value or less.
Flickers when the [LO] limit value is displayed.
(9) [LL] LED
(Comparator-4 LED)
Lights up when the measured value is [LL] limit value or less.
Flickers when the [LL] limit value is displayed.
(10) Operation keys Pushbutton switches to operate the WGA-680A.
Each key has multiple functions. Functions varies automatically with the
measuring status and setting status. For details, see "4-1.KEY OPERATIONS".
(1)
(2)
(5)
(8)
(7)
(10)
(4)
(6)
(9)
(3)
MEMO

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2-2. REAR PANEL
*Figure is AC model.
(1) Blank panel Blank panel is for WGA-680A-00.
In the case of optional model, the panel is the slot of optional model. For details,
see separate volume of "INSTRUCTION MANUAL (FOR BCD/RS-232C/RS-
485/TEDS OPTIONS)" and "INSTRUCTION MANUAL (FOR CC-LINK
OPTION)".
(2) [Transducer]
terminals
A : Bridge excitation (+) Red cable
B : Bridge output (-) White cable
C : Bridge excitation (-) Black cable
D : Bridge output (+) Green cable
E : Shield
To use the TEDS compatible transducer, see separate volume of "INSTRUCTION
MANUAL (FOR BCD/RS-232C/RS-485/TEDS OPTIONS)".
(3) [ANALOG OUTPUT]
terminals
COM : Common
Vo : Voltage output terminal
Io : Current output terminal
(4) [INPUT] terminals COM : Common
1 : ZERO command
2 : HOLD command
3 : RESET command
(5) [OUTPUT] terminals COM : Common
1 : [HH] output (comparator-3 output)
2 : [HI] output (comparator-1 output)
3 : [OK] output
4 : [LO] output (comparator-2 output)
5 : [LL] output (comparator-4 output)
(6) [LINE IN] terminals
(AC model) FG : GND terminal Be sure to connect the GND terminal to the ground.
N : AC power supply input terminal
L : AC power supply input terminal
[DC IN] terminals
(DC model)
FG : GND terminal Be sure to connect the GND terminal to the ground.
: DC power supply negative input terminal
: DC power supply positive input terminal
(7) Fitting metal For mounting onto the panel.
(8) Protective ground
terminal
Be sure to connect the GND terminal to the ground.
(1)
(3)
(6)(4)
(5)
(8)
(2)
(7)

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3. CONNECTION AND DEFAULT SETTING
3-1. PROCEDURES FOR MEASUREMENTS
This section describes necessary operations to be conducted prior to the actual measurements.
Section 3-2 To mount the WGA-680A on the panel Mount the WGA-680A on the panel.
Section 3-3 To connect transducers Connect various transducers to the
WGA-680A.
Section 3-4 To connect [INPUT] terminals Connect cables to the [INPUT] terminals.
Section 3-5 To connect [OUTPUT] terminals Connect cables to the [OUTPUT] terminals.
Section 3-6 To connect [ANALOG OUTPUT] terminals Connect cables to the [ANALOG OUTPUT]
terminals.
Section 3-7 To connect the power supply Connect the AC power supply and ground the
GND terminal.
Chapter 4 OPERATIONS AND FUNCTIONS Operate the WGA-680A and measure data.
For details, see "4. OPERATIONS AND
FUNCTIONS".

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3-2. TO MOUNT THE WGA-680A ON THE PANEL
To mount the WGA-680A on the panel, prepare a panel according
to the specified panel cut dimensions as shown at the right.
Then, mount the WGA-680A by referring the following
procedures.
(1) Cut out the panel according to the panel cut dimensions.
(2) Loosen the screws on the WGA-680A rear and remove the
fitting metal.
(3) Set the WGA-680A into the panel frame as described in the right
figure.
(4) Set the fitting metal from the rear.
(5) Tighten the screws and firmly fix the WGA-680A.
Fitting metal
Screw
Fitting metal
Screw

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For transducer wiring, use as short as possible 4-conductor shield cable (TEDS: 6-conductor cable).
In addition, locate the transducer far apart from power lines and wirings interfered with noise.
You cannot directly connect a remote sensing transducer.
When the WGA-680A has the optional TEDS terminals, do not connect the cables for the remote
sensing transducer.
Factory default of bridge excitation voltage is set to 2V. It can be changed to 10V. Set the voltage
applicable to transducer specifications (within recommended excitation voltage) before using the
transducer. For details, see “4-2. TO SELECT BRIDGE EXCITATION VOLTAGE.”
3-3. TO CONNECT TRANSDUCERS
3-3-1. Terminal blocks
It is recommend to connect the crimp terminals with insulation coating to the terminal blocks. Use crimp
terminals with insulation coating equivalent to JIS C 2805 crimp terminal for copper wire 1.25-3.
The terminal blocks have terminal block covers. Before connecting the wires, remove the terminal block
cover.
Before connecting the crimp terminals, remove the screws.
After completing wiring to the terminal block, put the terminal block cover.
Please do not press the terminal block too strongly.
3-3-2. To connect transducers
Connect transducers to terminals A to E as described
in the following.
(Cable colors are KYOWA's standard color codes.)
A: Bridge excitation (+) Red cable
B: Bridge output (-) White cable
C: Bridge excitation (-) Black cable
D: Bridge output (+) Green cable
E: Shield
NOTE
MEMO
WARNING
To prevent electric shock hazards, be sure to use the terminal block cover.

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3-4. TO CONNECT [INPUT] TERMINALS
Connection of [INPUT] terminals are as
follows.
COM : Common
1 : ZERO command
2 : HOLD command
3 : RESET command
To connect an external switch, open
collector, etc. to each [INPUT] terminal,
connect as described in the right figure.
Connect cables as follows.
1) Strip off the coating of the wire for approx. 11 mm and
twist the tip of the wire for not to loosen.
The available wire ranges are as follows.
Stranded wire : 0.2 mm
2
(AWG24) to
1.25 mm
2
(AWG16)
2) Press the lower button strongly by using the accessory
flat-head screw driver as described in the right figure.
3) Carefully insert the twisted wires into the upper hole.
4) Remove the flat-head screw driver from the lower
button. And pull the wires gently to check if they are
securely inserted.
3-5. TO CONNECT [OUTPUT] TERMINALS
Connection off [OUTPUT] terminals
are as follows.
COM : Common
1 : [HH] output (comparator-3 output)
2 : [HI] output (comparator-1 output)
3 : [OK] output
4 : [LO] output (comparator-2 output)
5 : [LL] output (comparator-4 output)
The [OUTPUT] terminals are
open collector.
(Capacity: 30 VDC, 20 mA max)

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Countermeasures against noise for [INPUT]/[OUTPUT]/[ANALOG OUTPUT] terminals
For more than 1 m long wiring, use twisted cable.
For more than 3 m long wiring, use a shield cable and connect the shield cable to the GND terminal.
For more than 30 m long wiring or for using the WGA-680A outdoors, be sure to take additional
countermeasures against noise.
For connecting multiple wires, be sure to twist them together in advance. After twisting, make sure
the wire is satisfied with the diameter to connect the terminal block.
3-6. TO CONNECT [ANALOG OUTPUT] TERMINALS
The pins and signals of the [ANALOG OUTPUT] terminals are as follows.
COM : Common
Vo : Voltage output terminal (±10 V)
Io : Current output terminal (4 to 20 mA)
NOTE

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Before connecting the AC power supply, check the power supply voltage.
The power supply voltage ranges of WGA-680A-00~04 (AC models) are form 100 to 240 VAC (50/60
Hz). Be sure to keep the voltage range.Be sure to connect the GND terminal to the ground.
If the power supply voltage exceeds the above range or if a voltage between each terminal and the
grounding has a potential exceeding power supply voltage, do not connect the AC power cable to the AC
power outlet. Or, it may cause system failures and accidents.
Be sure to connect the GND terminal to the ground.
Or, it may cause an electric shock hazard, lower the performance, and
cause trouble.
3-7. TO CONNECT POWER SUPPLY
3-7-1.WGA-680A-00~04 (AC models)
Do not forget to check that power voltage is from 100 to
240 VAC, 50/60 Hz (20 VA). Be sure to use the cable with
rated voltage having more than power supply voltage.
Please do not press the terminal block too strongly.
How to confirm the power voltage is as follows.
(1) Measure the voltage between the AC power outlet terminals with the
tester, and confirm that the voltage is between 100 to 240 VAC.
(2) Measure the voltage between each end of the AC power outlet and the
ground with the tester. Confirm that the one is 0 V and the other one
is between 100 to 240 VAC.
(3) If the WGA-680A is used at site using apparatuses generating
interfering noise, for example, induction motor, electric welding
machine, etc., power supply condition may be deteriorated due to
excessive noise. Take appropriate countermeasures against the noise
by using an insulation transformer or commercially available noise-cut
transformer.
NOTE
NOTE
WARNING
To prevent electric shock hazards, be sure to use the terminal block cover.
To prevent short circuit of the power supply, use crimp terminal with
insulation coating (equivalent to JIS C 2805 Crimp-type terminal lugs for
copper conductors 1.25-3).

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Before connecting the power supply, check the power supply voltage.
The power supply voltage ranges of WGA-680A-00~04 (AC models) from 10 to 30 VDC (10W).
Be sure to keep the voltage range. Be sure to connect the GND terminal to the ground.
If the power supply voltage exceeds the above range or if a voltage between each terminal and the
grounding has a potential exceeding power supply voltage, do not connect the power cable to the DC
power outlet. Or, it may cause system failures and accidents.
DC power supply negative input terminal is insulated from FG.
Be sure to connect the GND terminal to the ground.
Or, it may cause an electric shock hazard, lower the performance, and cause trouble.
3-7-2.WGA-680A-10~14 (DC models)
Do not forget to check that power voltage is from 10 to 30
VDC (10W). Be sure to use the cable with rated voltage
having more than power supply voltage.
Please do not press the terminal block too strongly.
NOTE
WARNING
To prevent electric shock hazards, be sure to use the terminal block cover.
To prevent short circuit of the power supply, use crimp terminal with
insulation coating (equivalent to JIS C 2805 Crimp-type terminal lugs for
copper conductors 1.25-3).

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Even if the [LOCK] LED is ON, the [INPUT] terminal is usable.
4. OPERATIONS AND FUNCTIONS
4-1.KEY OPERATIONS
4-1-1. Lock function
The LOCK function is used to prohibit the change in pre-set values in order to prevent erroneous operation.
In the [LOCK] status, you are not able to change the function and limit values ([HI] limit value, [LO] limit
value, etc.).
However, you are able to monitor the pre-set comparator limit values.
Before changing functions and limit values, cancel the [LOCK] status.
Power ON the WGA-680A and the mode is the MEASURING mode in the [LOCK] status.
After changing the settings, make the WGA-680A to the [LOCK] status to prevent erroneous operation.
How to set or cancel the [LOCK] status.
Press the FUNCTION key + the HOLD key for 2 seconds at the same time.
In [LOCK] status : [LOCK] status is canceled. [LOCK] LED turns ON.
In NOT [LOCK] status : The status becomes [LOCK] status. [LOCK] LED turns OFF.
4-1-2. Key operations in MEASURING mode
During the MEASURING mode, the WGA-680A measures physical quantities (load, pressure, torque,
displacement, etc.) by using strain gage transducers and displays their values.
To go to the SETTING mode, FUNCTION SELECTING mode, and LOCK mode, press keys in the
MEASURING mode.
However, the [LOCK] status limits the key operations. For details, see the following table.
Key operation Operations when the [LOCK] LED is OFF. Operations when the [LOCK]
LED is ON.
Press the ZERO key for 2
seconds.
Executes the DIGITAL ZERO function, "0"
is displayed as the indicated value, and goes
to the MEASURING mode.
Executes no function.
Press the HI HH key for
2 seconds.
Goes to the [HI] limit value SETTING
mode.
After pressing the SET key to set the [HI]
limit value, the SETTING mode goes to the
[HH] limit value SETTING mode.
Pre-set values is displayed.
Press the LO LL key for
2 seconds.
Goes to the [LO] limit value SETTING
mode.
After pressing the SET key to set the [LO]
limit value, the SETTING mode goes to the
[LL] limit value SETTING mode.
Pre-set values is displayed.
Press the FUNCTION
key for 2 seconds.
Goes to the FUNCTION SELECTING
mode.
Executes no function.
Press the HOLD key. Operates in the pre-set HOLD mode. Executes no function.
Press the HOLD key +
the FUNCTION key
for 2 seconds at the same
time.
The [LOCK] LED lights up and the mode
goes to the MEASURING mode.
The [LOCK] LED lights off. You
are able to select modes.
MEMO

IM-A-1048H
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4-1-3. Key operations in FUNCTION SELECTING mode
To go to the FUNCTION SELECTING mode, press the FUNCTION key for 2 seconds in the
MEASURING mode. The "F-01" is displayed on the indicator and you are able to select functions.
To select the functions from "F-01" to "F-26" on the FUNCTION SELECTING mode, press the key
or SHIFT + key.
To determine the function, press the SET key. The mode goes to the SETTING mode.
To back to the MEASURING mode, press the CANCEL key on the FUNCTION SELECTING mode.
4-1-4. Key operations in SETTING mode
Press the SET key after selecting the function on the FUNCTION SELECTING mode, the mode goes to
the function’s SETTING mode.
To set numerical values.
Move digits : Press the
Change numerical values : Press the key, key + SHIFT key.
Register pre-set values : Press the SET key.
The changed value is determined and stored (registered) in the
internal memory.
When numeric values are not required to set, "...." is displayed. Press the SET key in this status, the
function is executed.
To back to the FUNCTION SELECTING mode, press the CANCEL key on the SETTING mode.
To set numerical values.
(1)Setting available digit flickers.
(2)To move the target digit to the right, press the key.
The flickering digit moves the leftmost digit next to the rightmost digit.
The leftmost digit (5th digit)
Other digit (1st to 4th digit)
(4)To set the decimal point, when the function is in the calibration function.