Minebea Dsa-631 User manual

Dynamic Strain Amplifier

DSA-631

INSTRUCTION MANUAL

EN294-1320-E

INTRODUCTION

▲Before Using▼

We would like to express our thanks to you for your purchase of our product, dynamic

strain amplifier DAS-631. Please read this manual carefully before operating this

instrument.

This manual provides the information necessary to operate the instrument safely. This

manual covers basic functions and operations of the DAS-631 amplifiers and handling

precautions. Place this manual within reach of the DAS-631 amplifier. If you encounter

any problem in the manuals, please contact our representative.

▲Examining Contents in Package▼

If opening the package in a warm room during the cold season, open the package after it

has reached room temperature to avoid any operational failure due to condensation on the

surface of the product.

The warranty does not apply for the case where damages or faults caused by use against

instructions, warnings, or cautions.

This instrument is delivered after a thorough examination at the factory prior to shipment.

However, please examine the product's condition and verify that no obvious shipping

damage has occurred after opening the package. Also, examine the specifications of the

input units and accessories. If there are any missing or damaged items, please contact our

sales representative.

▲Cautions▼

●The contents of this manual are subject to change without notice.

transcribed or reproduced without written permission.

●Please let us know if there are any points that are unclear or missing in this manual.

●We do not assume any responsibility for the outcome of the use of DAS-631 amplifier.

PRECAUTIONS

To avoid accidents, read this manual carefully before use. Observe the following warning

and cautions when using amplifiers. The warranty does not apply any damage caused by

the use against instructions, warnings, and cautions. To safely use the amplifiers, the

following statements are used in this manual to call the readers' attention.

This indicates a condition or practice that could result in personal injury or loss of life, or

may result in light injury or physical damage if this equipment is misused due to neglect

of a Warning

This indicates a condition or practice that could result in light injury or damage to the

equipment or other property if this equipment is misused due to neglect of a Caution.

In order to avoid electrical shock or burning, confirm that no common mode voltage or

signal is applied to the signal wire when the signal wire is connected

ARNING

CAUTION

III

●POWER SUPPLY

Make sure that the power supply is within the rating. If any voltage exceeding the rated

voltage was supplied, there would be risk of damage to this amplifier, or even a fire. Also, in

order to prevent electric shock and hazards such as a fire, be sure to use only the AC power

cable and the adapter (3-prong/2-prong converter) supplied with this amplifier.

●Protective Grounding

Be sure to ground this amplifier before supplying power. Grounding is necessary to use this

amplifier safely, as well as to protect the user and peripheral equipment from injury or

damage. Be sure to observe the following instructions:

1) Protective grounding

This product uses a 3-pole power cable, which has grounding. Always connect to the power

outlet having grounding. If using 3-prong/2-prong adapter, secure the grounding by

connecting either a protective terminal or a grounding lead extending from the adapter.

2) Caution on protective function

While the power is supplied to the amplifier, do not cut or remove the protective grounding

line. Otherwise, safety of the amplifier is not guaranteed.

3) Protective function failure

Avoid using this product when there is a failure in protective grounding or protective

functions. Confirm that there is no failure in the protective function before using.

●Use in Gaseous Atmosphere

Never use this amplifier in a flammable or explosive atmosphere, or atmosphere of steam. Use

in such atmosphere will result in danger to users and the amplifier.

●Disassembling the Frame

It is dangerous to remove the frame. Do not remove the frame from the amplifier other than

100VAC/200VAC switching using the selection switch.

●Input Signal Connection

Connect the signal wire to the input terminal after connecting protective grounding terminal

to the ground. Please work after confirming that the signal and the common mode voltage are

not impressed to the input line when you connect the input line to prevent the shock hazard

and the accident of damaging by a fire.

●Note in operation

There is a possibility that high voltage is caused in the working of this product between the

input terminal (Input signal line) and this unit (protective grounding), or between the input

terminal and output (output signal line), etc. Therefore, please be careful enough on the

electric shock hazard with the operation.

●Installation category and pollution level of this product

This instrument is a unit used of installation category Ⅱand pollution level Ⅱ.

Please use it within this range. Please turn on the power supply of this product after

confirming the power supply is in ratings of this product without fail.

ARNING

●Caution in handling

When using this amplifier, always follow the precautions below.

1) Limitation of operator

Users who are not familiar with the operation of this recorder should avoid using it.

2) Use and storage environment

The storage temperature and humidity of the input units is -20 to 70C and 10 to 90%,

respectively. Avoid storing in places where the temperature could rise over the storage

temperature and where there is direct sunlight exposure such as inside an automobile.

Do not use this recorder at the following locations.

①Locations where the temperature and humidity rise due to direct sunlight or heaters.

(The operating environment of the amplifier; temperature: -10 to 50 °C, humidity: 20 to 85%)

②Wet locations

③Locations where salt, oil, or corrosive gases exist

④Damp or dusty locations

⑤Locations subject to strong vibrations

3) Cautions on power supply

①Be careful of power voltage fluctuations. Do not use the amplifier when these are likely to exceed the

rated voltage.

②If the power supply includes a lot of noise or high-voltage inductive noise, use noise filters to avoid

operation errors.

CAUTION

CAUTION IN HANDLING

Read this manual carefully before using the amplifier.

1) Do not apply neither voltage nor current to the output terminal of this amplifier from

external source.

2) Use this amplifier with power supply voltages from 85 VAC to 132 VAC, 180 VAC to 264 VAC,

or 10 VDC to 30 VDC. The AC power supply selection switch is provided inside the chassis.

To switch the AC power supply voltage, refer to page 42.

●When this amplifier is used in Japan domestic, the voltage that exceed power supply

voltage AC125 V cannot be supplied from the limitation of Electrical Appliances and

Material Safety Law.

If the power fuse is burnt, check the cause of fuse blow-out. To replace the fuse, always

disconnect the power plug and input/output signal cable first, and then replace the fuse in

the fuse holder. For how to replace fuse, see page 41. When replacing, examine the ratings of

fuse (e.g. for AC or DC).

3) The storage temperature and humidity of the input units is -10 C to 50 C and 20 % to 85 %,

respectively. If opening the package in a warm room during the cold season, open the package

after it has reached room temperature to avoid any operational failure due to condensation

on the surface of the product.

Do not use this recorder at the following locations.

①- High-humidity locations

②- Locations with direct sunlight exposure

③- In the vicinity of high-temperature heat source

④- Location with vibrations

⑤- Locations where salt, water, oil, or corrosive gases exist

4) When using many amplifier units, install fan units.

5) When a case is used to accommodate amplifiers, the case must be grounded.

6) This product uses a flash memory for saving setup values. Replacement of battery is not

needed accordingly.

7) As the DSA-631 have AC signal bridge voltage. Amplifier unit whose bridge voltage

frequency differs cannot be used in the same case. In addition, when using several units

closely, always make synchronization. Otherwise, noses may be generated. See 3-8 and 3-9

for details.

8) This amplifier unit uses rotary encoders are used for knobs to control functions. However,

indication position of the knob sometimes stays at the position between scale markings. In

such case, the settings upon power-up may differ from those upon turning off the amplifier.

To avoid such event, it is recommended to allow knob indication to be at the correct scale

marking position.

WARRANTY

We ship our products after conducting quality control, which covers from design to

manufacturing. It is, however, possible that failures may occur in the products. If the product

does not operate correctly, please make a check of the power supply, cable connections, or other

conditions before returning this product to us. For repair or calibration, contact our sales agency.

Before returning, be sure to inform us of the model, serial number, and problematic points. The

following is our warranty.

LIMITED WARRANTY

1) Warranty period : one year from our shipment.

2) Warranty limit

We will repair the defects of our product free of charge within the warranty period; however,

this warranty does not apply in the following cases.

①Damage or faults caused by incorrect use.

②Damage or faults caused by fire, earthquake, traffic accident, or other natural disasters.

③Damage or faults caused by a repair or modification that is carried out by someone other than our

service representative.

④Damage or faults caused by use or storage in environmental conditions that should be avoided.

⑤Periodical calibration.

⑥Damage or faults caused during transportation.

3) Liability : We do not assume any liabilities for equipment other than us.

VII

TABLE OFCONTENTS

INTRODUCTION

..........................................................................................................................................................................I

PRECAUTIONS

........................................................................................................................................................................... II

CAUTION IN HANDLING

.......................................................................................................................................................... V

WARRANTY

................................................................................................................................................................................VI

LIMITED WARRANTY

...............................................................................................................................................................VI

TABLE OF CONTENTS

........................................................................................................................................................... VII

1. OVERVIEW .......................................................................................................................................................................... １

1-1. FEATURES ............................................................................................................................................................................１

1-2. PRODUCT STRUCTURE.........................................................................................................................................................１

1-3. ACCESSORIES.......................................................................................................................................................................１

1-4. BLOCK DIAGRAM OF MEASUREMENT ................................................................................................................................２

1-5. FEATURES OF DYNAMIC STRAIN AMPLIFIER.....................................................................................................................３

2. NAMES AND FUNCTIONS OF PARTS .......................................................................................................................... ４

2-1. NAMES AND FUNCTIONS OF PARTS ON FRONT PANEL (SEE 2-1.).....................................................................................４

2-2. HOW TO SET CALIBRATION VALUE (CAL).........................................................................................................................８

2-3. INDICATION UPON BALANCING...........................................................................................................................................９

2-4. NAMES AND FUNCTIONS OF PARTS ON REAR PANEL (SEE FIG.2-2).................................................................................10

3. BEFORE MEASURING...................................................................................................................................................... 12

3-1. CABLE CONNECTIONS.........................................................................................................................................................12

3-2. OPERATION BEFORE MEASURING......................................................................................................................................13

3-3. BRIDGE CHECK FUNCTION.................................................................................................................................................15

3-4. CABLE LENGTH COMPENSATION FUNCTION ....................................................................................................................17

3-5. HOW TO SWITCH SPECIAL FUNCTION SETTING................................................................................................................19

3-6. CASE .....................................................................................................................................................................................20

4. MEASUREMENT................................................................................................................................................................ 25

4-1. CAUTIONS BEFORE MEASUREING (REFER TO TABLE 4-1)................................................................................................25

4-2. INPUT CONNECTION ............................................................................................................................................................26

4-3. CONNECTION OF OUTPUT TO LOAD ...................................................................................................................................31

4-4. HOW TO READ MEASURED VALUES ...................................................................................................................................32

VIII

4-5. SPECIAL APPLICATION ........................................................................................................................................................ 35

5. OPERATION THEORY.......................................................................................................................................................36

5-1. FLOW OF MEASUREMENT SIGNAL (REFER TO FIG.5-1)................................................................................................... 36

6. OPTIONAL FUNCTION.....................................................................................................................................................37

6-1. CURRENT OUTPUT (DSA631-P07 4~20MAOUTPUT UNIT)......................................................................................... 37

6-2. CASE FUNCTION AND TYPE ............................................................................................................................................... 37

7. MAINTENANCE..................................................................................................................................................................39

7-1. ITEMS TO BE CHECKED. ..................................................................................................................................................... 39

7-2. HOW TO REPLACE FUSE ..................................................................................................................................................... 41

7-3. CHANGING AC POWER SUPPLY VOLTAGE .......................................................................................................................... 42

8. SPECIFICATIONS...............................................................................................................................................................43

9. REFERENCES .....................................................................................................................................................................45

9-1. FREQUENCY CHARACTERISTICS AND PHASE PROPERTY ................................................................................................. 45

9-2. CABLE LIST ......................................................................................................................................................................... 46

9-3. OUTLINE DIMENSIONS ....................................................................................................................................................... 48