KYOWA WGA-120A User manual

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INSTRUCTION MANUAL
WGA-120A
Carrier type instrumentation amplifier
Thank you for purchasing KYOWA's product WGA-120A Carrier type 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.
Kyowa Electronic Instruments Co., Ltd.

CONTENTS
SAFETY PRECAUTIONS (Do not forget to read the safety precautions prior to use.)...................1
1. CONTROLS AND INDICATORS...........................................................................................13
2. INITIAL SETTINGS..............................................................................................................16
2-1 TO CHANGE JUMPERS (MANUAL BALANCE MODEL)..............................................17
2-2 TO CHANGE JUMPERS (AUTO BALANCE MODEL) ...................................................18
2-3 EXAMPLE OF CHANGING JUMPERS...........................................................................25
3. CONNECTION......................................................................................................................28
3-1 TO FIX THE WGA-120A..................................................................................................28
3-1-1 To mount the WGA-120A onto the panel.....................................................................28
3-1-2 To mount the WGA-120Aonto the DIN rail.................................................................29
3-2 TO CONNECT POWER SUPPLY ....................................................................................30
3-3 TO CONNECT TRANSDUCERS......................................................................................32
3-4 TO CONNECT TRANSDUCERS IN PARALLEL.............................................................32
3-5 TO USE STRAIN GAGES ................................................................................................34
3-6 TO CONNECT THEAUTO BALANCE CONTROLINPUT TERMINAL ........................36
3-7 TO CONNECT THE OUTPUT TERMINAL.....................................................................37

4. OPERATION PROCEDURES................................................................................................38
4-1 TO TURN ON THE POWER............................................................................................40
4-2 TO ADJUST THE ZERO BALANCE................................................................................40
4-3 TO ADJUST THE SPAN ...................................................................................................41
4-3-1 By the actual load calibration .....................................................................................41
4-3-2 By the CAL ................................................................................................................44
4-4 CORRECTION REQUIRED WHENAN EXTENSION CABLE WAS USED....................50
4-5 AUTO BALANCE ADJUSTMENT ...................................................................................53
5. SPECIFICATIONS.................................................................................................................55
5-1 SPECIFICATIONS...........................................................................................................55
5-2 BLOCK DIAGRAM .........................................................................................................61
5-3 DIMENSIONS..................................................................................................................62

-1-
SAFETY PRECAUTIONS (Do not forget to read the safety precautions prior to use.)
zPRIOR TO USE
Do not forget to read the safety precautions prior to use.
Also, keep the manual within easy reach so that you can refer to it whenever necessary.
For safe use of the WGA-120A, do not forget to read the "Safety Precautions" prior to use.
Kyowa Electronic Instruments Co., Ltd. assumes no liability for any damage resulting from the user's
failure to comply with the safety precautions.

-2-
zFor safety operation of the WGA-120A, the following symbol marks are used in the Instruction
Manual.
Indicates “PROTECTIVE GROUND TERMINAL.”
Be sure to connect the GND terminal to the ground.
zFor safety operation of the WGA-120A, the following symbol marks are used in the Instruction
Manual.
Improper operation of the system may result in death or severe injury of the
operator.
Improper operation of the system may result in injury of the operator and
physical damage of the system.
△
！WA R N ING
△
！CAUTION

-3-
△
！WARNING
zPower supply
To prevent a fire hazard, ensure that the power supply voltage specified for the WGA-120A matches the
local line voltage before turning ON the power.
The power supply voltages are described in the following.
DC model: 10.5 to 15 VDC, power dissipation 3.5 W or less
100 VAC model: 90 to 110 VAC, power dissipation 6.5 VA or less
200 VAC model: 180 to 220 VAC, power dissipation 6.5 VA or less
240 VAC model: 216 to 264 VAC, power dissipation 6.5 VA or less
zPower cable and power outlet
The WGA-120A does not have POWER switch. Before connecting power cable to the WGA-120A,
make sure the distribution board does not supply power to the power cable. Or, electricity shock hazard
or damage of the product may result.
zProtective ground
To prevent an electric shock hazards, be sure to connect the product to the ground before turning ON the
power.
When 2P parallel vinyl wire is used for power cable, always connect the GND terminal with a separate
ground wire.

-4-
zConfirmation of protective functions
To prevent electric shock hazards, when any trouble occurs in protective functions including the GND
terminal and a fuse, do not to operate the product. Furthermore, before operating the product, always
check whether error exists or not in protective functions.
zFuse
When the pilot lamp does not light up, the fuse may be blown.
When replacing the fuse with a new one, be sure to use a fuse providing the same rating (current, voltage,
type) as specified for the product. Do not use any fuse other than specified. Do not short-circuit the fuse
holder. Before replacing the fuse with a new one, disconnect the power cable.
Use the following fuse.
DC model Resettable fuse (replacements are not required.)
100 VAC model
200 VAC model Fast acting, 100mA, 250 V, Diameter: 5 mm, Length: 20 mm
240 VAC model

-5-
zStorage and usage in gases
Do not use/store the WGA-120A in inflammable gases, explosive gases, or vapor. Using the WGA-120A
under the above environment is too risky.
zExternal connection
To prevent electric shock hazards, be sure to connect the GND terminal to the ground before connecting
the object to be measured and external control circuit to the product.
zTerminal cover
Be sure to put a terminal cover on the terminal block. Or, electric shock hazard may result.