2
DRC-4720 BRIDGE INPUT SIGNAL CONDITIONER
FULL BRIDGE CONNECTION
SINGLE ENDED
1. Hook Up Procedure
A. Connect the +out of the load cell to the +INPUT, pin 3.
B. Connect the -out of the load cell to the -INPUT, pin 4.
C. Connect the +excitation of the load cell to +EXCITATION,
pin 1.
D. Connect the -excitation of the load cell to -EXCITATION,
pin
2.
E. Connect the +24 VDC power supply to +24V, pin 8 and
COM, pin 7.
2. Turn on Procedure
A. Verify that the hook up procedure is complete.
B. Turn on the +24 VDC power source connected to the
DRC-4720.
3. Calibration Procedure
A. Jumper the +INPUT and the -INPUT terminals, pins 3
and 4, together.
B. Check the Gain Switch Table, and set SW1-1 and SW1-2
to the expected full scale output of the load cell.
Getting Started with the Model DRC-4720
SW1-1
SW1-2
FULL SCALE
LOAD CELL INPUT
OFF
OFF
30 mV
ON
OFF
20 mV
ON
ON
10 mV
C. Connect a current meter across the output, pins 5 and 6.
D. Adjust the Zero Adjustment potentiometer for the
desired
zero
current.
E. Remove the jumper from the +INPUT and -INPUT
terminals.
F. With no load on the load cell, readjust the zero output.
G. Apply a known load to the load cell; in most cases it
would be 100% of full scale.
H. Adjust the SPAN ADJUSTMENT potentiometer for the
desired full scale output current.
I.
Repeat steps F thru H until the desired settings are
obtained.
