7647 datasheet(14/28 Pages) PHOENIX

Part #	7647

Description	Inline analog strain gauge input terminal,two precise inputs, 4, 6-wire connection method

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IB IL SGI 2/P-PAC

7647_en_04

PHOENIX CONTACT

14

13.2

6-wire connection (several strain gauge load

cells per channel)

Each channel can supply a current of up to 90 mA. For in-

stance, 6 load cells with a basic resistance of 350 Ω may be

connected in parallel.

Figure 7

Connection of several strain gauges in 6-wire

technology

13.3

4-wire connection with a shunt resistor

The following figure shows the connection of a resistive pres-

sure sensor with an 80% calibration. This sensor is typically

used for injection molding of plastics.

Figure 8

Connection of strain gauges in 4-wire technol-

ogy with a shunt resistor

Channel 1/channel 2: Strain gauges can also be connected

to the terminal in 4-wire technology.

In this case connect +U

V with +U0 and GNDUv with -U0.

There is no temperature and long-term drift compensation for

the connecting cable in 4-wire technology.

Key:

R

L:

Cable resistance

1

1.2

2.2

1.3

2.3

1.4

2.4

1.1

2.1

R

L

R

L

R

L

R

L

R

L

R

L

U

V

U

V

U

V

U

0

U

0

U

0

U

d

U

d

U

d

R

+U

V

+U

0

+U

d

-U

d

-U

0

GND

UV

FE

Connector

Channel

Strain gauge1

Strain gauge2

Distribution

Strain gaugen

Key:

R

L:

Cable resistance

+Uv1

+U01

Tx+

+Ud1

FE

Ka1

GND

Uv

GND

Tx

GND

Tx

-U01

Tx-

-Ud1

FE

Kb1

TR

CH1

CH2

D

R

L

R

L

R

CAL

12

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7647 Datasheet(PDF) 14 Page - PHOENIX CONTACT

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