DayTronic 5D78 Gebrauchsanweisung - Seite 20

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RANSDUCER

Each wire or jumper of the transducer cable is to be

firmly secured to the appropriate screw terminal of the

terminal block that plugs into the installed 5D78 mod-

ule's 10-pin TRANSDUCER CONNECTOR (see Fig. 3).

4-wire connections to a full-bridge strain gage transduc-

er are given in Fig. 8.a. This wiring is to be used with a

cable of 18-gage conductors which is under 20 feet in

length. In this case, the +SENSE and –SENSE lines are

tied to the corresponding EXCITATION lines at the 5D78

CONNECTOR. It is recommended that the resistance

of the conductors not exceed 0.0001 of the bridge

resistance.

8-wire connections to a full-bridge strain gage transduc-

er are given in Fig. 8.b. This wiring is to be used when

the cable is 20 feet or longer, or when fine wire is used.

In this case, the +SENSE and –SENSE lines are tied to

Fig. 8

Model 5D78

Transducer Connections

Fig. 8.a

4-Wire Strain

Gage Cabling

(under 20 ft. in length)

Fig. 8.b

8-Wire Strain

Gage Cabling

(20 ft. or longer)

3000PLUS

ONNECTIONS

the corresponding EXCITATION lines (and also the CAL

SENSE line to the +SIGNAL line) at the transducer. Note

also the extra wire connected to the –SIGNAL line at

the transducer, but left unconnected at the 5D78. This

wire is to be paired with the CAL SENSE line to estab-

lish proper shielding and to avoid asymmetrical dynam-

ic loading.

When an optional SHUNT RESISTOR is being used in

TWO-POINT (DEADWEIGHT) calibration of the

3000PLUS, it should be tied across Terminals 7 (CAL

ENABLE) and 10 (CAL SENSE) of the Transducer Con-

nector. For independent activation of the shunt for

either a positive or negative upscale reading, see Sec-

tion 5.F.

* (NOT ISOLATED; connects

internally to CHASSIS GROUND)

EXTRA WIRE

(paired with "CAL SENSE," unconnected at

Transducer Connector)

* (NOT ISOLATED; connects

internally to CHASSIS GROUND)

5D78 I

WITH

NSTRUCTION

2. C

ONNECTIONS

SCREW TERMINAL BLOCK

PLUGGED INTO TRANSDUCER

CONNECTOR (see Fig. 3)

Optional

Shunt Resistor

SCREW TERMINAL BLOCK

PLUGGED INTO TRANSDUCER

CONNECTOR (see Fig. 3)

Optional

Shunt Resistor

. SB.3

ANUAL V

5D78 Module

CAL SENSE

+SIGNAL

–SIGNAL

CAL ENABLE

–EXCITATION

–SENSE

+SENSE

+EXCITATION

[FOR FUTURE USE]

SHIELD*