3KP78 - 2.3
3000PLUS
WITH
5D78 I
NSTRUCTION
M
ANUAL V
. SB.3
2. C
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.
CAL SENSE
–SIGNAL
CAL ENABLE
–EXCITATION
–SENSE
+SENSE
+EXCITATION
SHIELD*
10
9
8
7
6
5
4
3
2
1
+SIGNAL
* (NOT ISOLATED; connects
internally to CHASSIS GROUND)
Optional
Shunt Resistor
[FOR FUTURE USE]
5D78 Module
SCREW TERMINAL BLOCK
PLUGGED INTO TRANSDUCER
CONNECTOR (see Fig. 3)
Fig. 8
Model 5D78
Transducer Connections
Fig. 8.a
4-Wire Strain
Gage Cabling
(under 20 ft. in length)
CAL SENSE
–SIGNAL
CAL ENABLE
–EXCITATION
–SENSE
+SENSE
+EXCITATION
SHIELD*
10
9
8
7
6
5
4
3
2
1
+SIGNAL
EXTRA WIRE
(paired with "CAL SENSE," unconnected at
Transducer Connector)
* (NOT ISOLATED; connects
internally to CHASSIS GROUND)
Optional
Shunt Resistor
[FOR FUTURE USE]
5D78 Module
SCREW TERMINAL BLOCK
PLUGGED INTO TRANSDUCER
CONNECTOR (see Fig. 3)
Fig. 8.b
8-Wire Strain
Gage Cabling
(20 ft. or longer)
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
2.
C
T
RANSDUCER
C
ONNECTIONS
