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Programming the Outputs
Pump) and press OK
4. Scroll to Special Control and press OK
5. Scroll to Time Modulate and press F1
6. Use Up/Down and Left/Right Arrow keys to Edit
the Period value then press F2 in this example
the default Period is set to 120 second
7. Use ESC key to Exit
This method works on relays 1 – 5 and with 6 – 9
when they are in the ON/OFF mode.
10.11.3
PID Control
SPECIAL CONTROL TIP:
When using Timed Cycling, Time
Modulate or PID control, best results for
tuning the loop are achieved if you only
change one variable at a time and wait for
two or three cycles to observe the effect
of this change. This would include
changing the stroke % of the pump and
any setting in the special control program.
Note: Relays P6-P9 must be set to ON/OFF Mode
See section 10.3 Enable and Configure a
Relay
Each of the P6 to P9 and R1-R5 Outputs can be
configured for PID (Proportional-Integral-Difference)
control. PID control can also be used on 4-20mA
outputs.
We highly recommend Timed Cycling or Time
Modulate for control over PID because these
methods are highly functional and simple to set
up/understand. In most water treating applications, a
full PID setup does not noticeably increase the
control regulation of the process but is difficult to set
up/tune. However, using only the proportional setting
of the PID setup and leaving the others settings at
default is easy and effective.
If Relay outputs 1 to 5 are configured for PID control,
they are implemented by continuously modifying the
pump relay ON & OFF times.
1. To set and adjust the PID settings, press MENU
2. Scroll to the I/O Setup selection and press OK
3. Scroll to select the desired output (6:Chlorine
Pump) and press OK
4. Scroll to Special Control and press OK
5. Scroll to PID Control and press F1
6. Use Up/Down and Left/Right Arrow keys to Edit
Kp Proportional value then press F2
7. Use Up/Down and Left/Right Arrow keys to Edit
Integral Rate value then press F2
8. Use Up/Down and Left/Right Arrow keys to Edit
Difference Rate value then press F2
9. Use Up/Down and Left/Right Arrow keys to Edit
Relay Period value (if P6-P9 is set to pulse
output skip this step) then press F2
10. Use ESC key to Exit
Table 14 PID parameters
Page 78 of 102
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