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Common control parameters include:
• Pump Intake Pressure (ESP system)
• Tank Level (SPS system)
Setting up PID Speed Control Mode is aided by the Setup Pump Speed PID wizard. To execute the wizard,
from the Home Screen select
Settings -> Menu -> Set Drive Mode -> PID Control Mode -> Setup Pump Speed PID
Follow the on-screen directions.
Information needed by the Setup Pump Speed PID wizard:
• Control Parameter.
• Custom name for the setpoint.
• Minimum (Low Clamp) and Maximum (High Clamp) frequencies for the PID control. Leaving these
values at 0 will set the low and high clamp frequencies to the
drive’s Min Frequency and Max Frequency,
respectively.
The low clamp is set by the
“Offset” parameter and the high clamp is set by the “Span” parameter.
• PID Reverse Acting. A reverse acting PID is one in which the control variable with decrease when the
pump speed is increased. Pump Intake Pressure in an ESP system is an example of a reverse acting PID
(pump intake pressure should decrease as pump speed increases). Tank Level while pumping into a tank,
however, would be an example of a forward acting PID (tank level increases as pump speed increases).
• PID Update Time. The control variable is tested against the setpoint and the drive frequency is adjusted
on this time period. A 5 second period is recommended for slow moving signals such as signals from the
downhole sensor. A 1 second period is recommended for faster moving signals.
• Conditionally run the PID? The user can optionally set the PID to run only when specific conditions are
met. To use this option, set up T159 Run SpdCtrlPID trigger to be active when you want the PID to run.
When the trigger is CLEAR, the PID will not run and the motor speed is based on M028 Freq Setpoint. For
example, if you want the drive to run at a fixed speed for 2 minutes before using the PID, set the Trip
Delay for T159 to 120 seconds. At startup, the motor will go to the Start Frequency, then change to the
Manual Frequency for 120 seconds and then start using PID control. If you answer No at this step, the
PID will control motor speed as soon as it reaches the Start Frequency.
• Set system to Pump Speed Control Mode now? The Drive Mode can be changed to PID Speed Control
within the wizard, or it can be changed at any time from Settings -> Menu -> Set Drive Mode.
When the wizard is complete, the PID Control Mode menu will reappear. Set the Setpoint (label will be
based on what you set up in the wizard) to the desired control value.
If the Drive Mode
wasn’t changed in the wizard, change it now to PID Speed Cntrl. Start the drive. The drive
speed will vary to try to make the control parameter match the setpoint.