HBM MC3 Manuel utilisateur

A1705-3.2 en/de/fr

Measuring amplifier

for strain gage transducers

MC3

Operating manual

Bedienungsanleitung

Messverstärker für

DMS−Aufnehmer

Amplificateur de mesure

pour capteurs à jauges

English Page 3 −20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Deutsch Seite 21 −38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Francais Seite 39 −59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

MC3

HBMA1705−3.2 en/de/fr

Contents Page

Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Controls 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Description of Operation 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Electrical connection 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Mounting 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Construction of the MC3 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Measuring cable 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.4 Transducer connections 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.5 Measuring signal output 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.6 Limit switch 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.7 Supply voltage 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.8 Bridge supply voltage 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Balancing and adjustment 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 Zero balance 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.2 Current output 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3 Measuring range 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.4 Adjustment 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.5 Limit switch 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.6 Measuring signal output 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Circuit diagram 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Contact Allocation, Components Layout 19. . . . . . . . . . . . . . . . . . . . . . .

4MC3

HBM A1705−3.2 en/de/fr

Safety instructions

Appropriate use

The MC3 with the connected transducers may be used for measurement and

directly related control and regulation tasks, only. Any other use is not ap-

propriate.

To ensure safe operation, the MC3 may only be used according to the specifi-

cations given in this manual. When using the transducer, the legal and safety

regulations for the respective application must also be observed. The same

applies if accessories are used.

General dangers of failing to follows the safety instructions

The MC3 complies with the state of the art and is operationally reliable. If the

device is used and operated inappropriately by untrained personnel, residual

dangers might develop.

Any person charged with device installation, operation, maintenance or repair

must in any case have read and understood the operating manual and the

safety instructions, in particular.

Conditions on site

Protect the equipment from direct contact with water.

Maintenance and cleaning

The MC3 is maintenance-free. Please note the following when cleaning the

housing:

−Before cleaning, disconnect the equipment from the power supply.

−Clean the housing with a soft, slightly damp (not wet!) cloth. Never use

solvents, since these could damage the labelling.

−When cleaning, ensure that no liquid gets into the equipment or connec-

tions.

Remaining dangers

The MC3 scope of performance and supply covers part of the measuring-

technology, only. The plant designer/constructor/operator must in addition de-

sign, realise and take responsibility for the measuring-system’s safety such

that potential remaining dangers are minimized. The respective regulations

must in any case be observed. Residual dangers regarding the measuring

system must be specified explicitly.

MC3

HBM

A1705−3.2 en/de/fr

If there is any risk of remaining dangers when working with the MC3, it is

pointed out in this introduction by means of the following symbols:

Symbol: DANGER

Meaning: Maximum danger level

Warns of a decidedly dangerous situation in which failure to comply with

safety requirements can lead to death or serious physical injury.

Symbol: WARNING

Meaning: Dangerous situation

Warns of a potentially dangerous situation in which failure to comply with

safety requirements can lead to death or serious physical injury.

Symbol: CAUTION

Meaning: Potentially dangerous situation

Warns of a potentially dangerous situation in which failure to comply with

safety requirements could lead to damage to property and slight or moderate

physical injury.

Symbols for operating instructions and useful information:

Symbol: NOTE

Means that important information about the product or its handling is being

given.

Symbol:

Meaning: CE mark

The CE mark enables the manufacturer to guarantee that the product com-

plies with the requirements of the relevant EC directives (see Declaration of

Conformity at http://www.hbm.com/HBMdoc).

6MC3

HBM A1705−3.2 en/de/fr

Safe operation

Do only quit error messages if the reason for the error has been eliminated

and there is no more danger.

Reconstruction and modifications

HBM’s express consent is required for modifications regarding the MC3

construction and safety. HBM does not take responsibility for damage result-

ing from unauthorized modifications.

In particular, repair and soldering works on the boards are prohibited. If com-

plete componentry is replaced use original HBM components, only.

Qualified personnel

The device may be used by qualified personnel, only; the technical data and

the special safety regulations must in any case be observed. When using the

device, the legal and safety regulations for the respective application must

also be observed. The same applies if accessories are used.

Qualified personnel means: personnel familiar with the installation, mounting,

start-up and operation of the product, and trained according to their job.

Maintenance and repair work on an open device with the power on should

only be undertaken by trained personnel who are aware of the above-men-

tioned dangers.

MC3

HBM

A1705−3.2 en/de/fr

NOTE

This manual apply to MC3 measuring amplifier from Hardware

Version 1.00. The label on the printed circuit board is visible when

the housing cover is opened (see (7) in the following figure).

1 Controls

The controls are accessible on opening the top of the housing.

R44

R58

R26 P21

P22

P24

P23

S21

S22

Fig. 1.1: Control elements

Notes:

1 A screwdriver type potentiometer P 24 −setting the switching point of the

limit switch.

2 Switch S 22 −Selection of voltage or current output (option).

3 Screwdriver type potentiometer P 21 −Zero balance for amount.

4 Screwdriver type potentiometer P 22 −Zero balance for phase.

5 Screwdriver type potentiometer P 23 −Fine adjustment of meas. range.

6 Switch S 21 −Measuring range adjustment

8MC3

HBM A1705−3.2 en/de/fr

7 Hardware-Version MC3

Definition of the slide switch positions:

Position 1: Circle visible

Position 2: Circle obscured

Fig. 1.2: Dimension (in mm)

MC3

HBM

A1705−3.2 en/de/fr

2 Description of Operation

Measuring amplifier MC3 is used with strain gages in a full bridge circuit or

with strain gage transducers to construct an uncomplicated and economical

measuring system.

Suitable indicating equipments for connection to this system include digital in-

dicators for switchboard installation (e.g. DA2510).

The MC3 supplies the bridge supply voltage of the transducer, amplifies the

transducer output signal and outputs a dc voltage signal of −5 V ... 0 ... + 5V

proportional to the measured value.

A limit switch with open collector output can be adjusted over the range of

0 ... + 5 V.

When equipped with an optional final stage, an output current of

4 mA ... 20 mA is available.

Strain gages or strain gage transducers in full bridge circuit with a bridge re-

sistance of 300 ohm ... 1400 ohm may be connected. Generator G generates

a sinusoidal bridge supply voltage of 2 V (rms) with 1 kHz carrier frequency.

The connected transducer outputs a signal proportional to the measured

value when under mechanical load and this is pre−amplified in the differential

amplifier of the MC3.

The voltage necessary for balancing the transducer zero signal is added to

the measurement signal in accordance with amplitude and phase and both

are amplified depending upon the measuring range selected. Finally, the mea-

surement signal is rectified in demodulator D with the correct phase.

The output amplifier EV with low pass filter amplifies the rectified measure-

ment signal to the output level of 5 V under the rated load of the trans-

ducer. The residual carrier voltages are suppressed to a value of < 1 %. The

measuring frequency range is 0 Hz ... 30 Hz at −1 dB (or 0 ... 65 Hz at −3

dB).

10 MC3

HBM A1705−3.2 en/de/fr

Strain gage

full bridge

(300 Ω... 1400 Ω)

Fig. 2.1: Block circuit diagram: DV = Differential amplifier; TV = Carrier fre-

quency amplifier; D= Demodulator; EV/TP = Output amplifier with low

pass; G = Generator; GR = Limit value switch; K= Stabilizer; S 21 =

Measuring range selector switch; P 21, P 22 = Zero signal adjustment

The switching point of the limit switch GR can be set in the range of 0V...+ 5V.

Both the set voltage and the measurement signal are applied to a comparator.

If the set level should be exceeded by the measurement signal, a transistor is

switched. Switching processes can be carried out via the collector connec-

tions which are taken out. Maximum load 30 V; 50 mA; switching capacity

1.5 W.

If the MC3 should be equipped with an optional final stage, operation can be

carried out with ”live zero”. An impressed current of from 4 mA (zero signal,

transducer unloaded) to 20 mA (rated output signal) is then available at the

output. This is particularly advantageous because faults such as line breaks

or other electrical defects are recognised immediately. Current or voltage out-

put can be selected by a slide switch.

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