Moore Industries STA - Page 14

www.miinet.com Moore Industries-International, Inc.
- 14 -
User’s Manual
225-748-00P
August 2024
Moore industries-International, Inc.
Units with the Analog Output option (-AO)
The STA’s analog output can be user congured one of three ways – 1) 0-20mA sourced with
voltage sourced by the STA (also referred to as Io Source) or 2) 0-20mA with voltage sourced by
the DCS (also referred to as Io Sink) or 3) 0-10V (also referred to as Vo).
Note that even though 0-20mA is the range of the analog output it can be scaled by the user for a
narrower range (such as 4-20mA). The same goes for the voltage output.
1. Connect the analog output as per Figure 3.3. Use the terminals that are correct for your
application.
2. When testing the milliamp output it is best to use a 250 ohm precision resistor across the
output terminals (as shown in Figure 3.3). Then you can use your multimeter (set to voltage)
to read the voltage drop across the resistor. Hence a reading of 1V means that the analog
output is putting out 4mA, and a reading of 5V equates to a 20mA output. If using the STAs
voltage output terminals (+/-Vo) the voltage can be read directly with your multimeter.
3. Set your input simulator to the low end of your congured input span. Verify that the analog
output is correct. By example – a 1V reading across your 250 ohm resistor equates to a
4mA output.
4. Set your input simulator to the high end of your congured input span. Verify that the analog
output is correct. By example – a 5V reading across your 250 ohm resistor equates to a
20mA output.
You have now conrmed that your STA is operating correctly and can now be condently
installed into your application.
3. Set your input simulator to the low end of your congured input span. By example – if your
input is congured for a Type T thermocouple and your input range is set for 0-100° C then
use a Type T thermocouple simulator and set it to simulate 0° C. Verify that the STA is
reading 0° C on its display window.
4. Set your input simulator to the high end of your congured input span and verify that the
STA’s display window correctly reects the input.
5. Set your input simulator to a value higher or lower than your congured input span and
verify that the Fault Relay changes state. The Fault Relay can be reset via the front panel
push buttons.
6. Temporarily remove one of your input connections to verify that the Broken Wire feature is
working. The Fault Relay can be reset via the front panel push buttons or if congured via
MR terminals.
7. Alarm Relays:
By adjusting your input up and down you can conrm the operation of the Alarm Relays.
Use your multimeter (set to ohms) to verify the state of the relay contacts.
Programmable RTD, T/C, Ohms, mV and Potentiometer Safety Trip Alarm
STA
TPRG
SECTION 2