PD2-6100
Large Display Strain Gauge Meter Instruction Manual
15
Figure 13. mV Transducer Input Connections
Shunt Calibration
The PD6100 is equipped with a means of simulating strain in a strain gauge
bridge circuit, via an included shunt resistor in the meter. This technique is
performed by enabling the “shunt resistor” switch (switch 5), which in turn
shunts one leg of a connected strain bridge with a predetermined resistive
load (60.4k). This technique can be used as a means of verifying
instrumentation by simulating a physical input. With no load connected, the
enabling of the shunt resistor (switch 5) will simulate approximately a 70%
F.S. load in the case of a 350Ω Strain Bridge.
Figure 14. Shunt Resistor
Modbus RTU Serial Communications
Serial communications connection can be made to the onboard RS485 terminal block or USB
connector shown in Figure 7. If RS232 is required, an RS485 to RS232 adapter (PDA7485) may
be used. See Ordering Information on page 4 for additional information.
Relay Connections
Relay connections are made to two
six-terminal connectors labeled
RELAY1 – RELAY4 on Figure 7.
Each relay’s C terminal is common
only to the normally open (NO) and
normally closed (NC) contacts of the
corresponding relay. The relays’ C
terminals should not be confused with
the COM (common) terminal of the
INPUT SIGNAL connector.
Figure 15. Relay Connections
Notes
•
Two-wire mV signals: Connect positive
to SG+ and negative to SG-
•
Four-wire transducer: Connect EX- to
negative power transducer terminal.
4
3
6
5
2
1
RELAY4
RELAY3
4
3
6
5
2
1
RELAY2
RELAY1
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