Salter Brecknell 200ES User Manual

Page 46

E-2

Here is a suggested connection diagram for a PLC:

+24 VDC

or AA

or BB

200

PLC

GND

4-20A

4-20B

NOTE 1

: Do NOT connect the indicator ground to the PLC ground.

Here is how to test to see if it is working correctly:

1. Configure and calibrate the indicator to your load device. Ensure the weighing function is

working properly.

2. Connect the AA (4-20A) and BB (4-20B) output wires to an external 24 VDC power supply

and 250 Ω resistor as shown in the above test diagram.

3. When the indicator is displaying zero, the output should be 4 mA. Since V=IR, you should

measure 1 VDC across R

4. When the indicator is displaying the full-scale load, the output should be 20 mA. Again, since

V=IR, you should measure 5 VDC across R

Here is how you fine-tune the output using F23:

1. Enter the Setup Menu and scroll to F23. For directions on entering the Setup Menu, see

Chapter 3 of the manual.

2. Push the down (ZERO) key once. The indicator outputs 4 mA and displays a number.

3. While monitoring the voltage across R

, use the right (PRINT) or left (TARE) keys to change

the displayed value until the measured voltage is exactly 1 VDC.

4. Press the SET (Net/Gross) key to save. The indicator outputs 20 mA and displays another

number.

5. While monitoring the voltage across R

, use the right (PRINT) or left (TARE) keys to change

the displayed value until the measured voltage is exactly 5 VDC.

6. Press the SET (Net/Gross) key to save and revert back to F23.

This manual is related to the following products: