MODEL 54eA | SECTION 5.0 |
| SOFTWARE CONFIGURATION |
5.3 CHANGING OUTPUT SETPOINTS (PID ONLY)
1.This section describes how to assign the setpoint and the upper and lower range values (URV and LRV) when the 54eA is being used for PID control. Assign the LRV to 4 mA and the URV to 20 mA. The LRV is the devi- ation from the setpoint that will result in a 4 mA output. The URV is the deviation from the setpoint that will result in a 20 mA output.
Example: The setpoint is 1.00 ppm. The URV is +0.50 and the LRV is 0.00. If the present reading is 1.20 ppm, the output will be (1.20 - 1.00)/(0.50 - 0.00) or 40% of the range (10.40 mA). If the present reading is 1.50 ppm, the output will be (1.50 - 1.00)/(0.50 - 0.00) or 100% of the range (20.00 mA). If the present reading is less than the setpoint, the output will be 4 mA.
The control setpoint is usually the condition where the output current is a minimum. The P and I control cal- culations use the setpoint to adjust the output to the desired level based on the parameters established in Section 5.6.
To configure the controller for PID control, see Section 5.6.
Alarm setpoints
Output setpoints
Simulated test
ExitEnter
Output 1 setpoints Output 2 setpoints
2.Press any key to enter the main menu. Move the cursor to "Program" and press Enter (F4).
3.Move the cursor to "Output setpoints" and press Enter (F4).
4. Move the cursor to the desired output and press Enter (F4).
ExitEnter
CAUTION: Current Output 1 will be affected.
5.This screen confirms that changes to output 1 are going to be made. Use caution. Changes may degrade process control. Press Cont (F3) to continue. Otherwise, press Abort (F1).
Abort Cont
Setpoint : 1.000 ppm
4mA: 0.000 ppm
20mA: 10.00 ppm
ExitEdit
6.This screen shows the present settings for Output 1. If the output was configured to be
instead of "4mA". The live current output is shown on the fourth line. Press the ê key once to view the live output.
Move the cursor to the desired line and press Edit (F4). Use the arrow keys to change the value. Press Save (F4) to store the new value.
Press Exit (F1) to return to the screen in step 4. Choose the other output and continue.
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