M588-00-880 Issue E
Page 130 © Edwards Limited 2015. All rights reserved.
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Appendix A2
A2.11.5 Set the PID target pressure set point
From the PID menu select Target pressure and enter the desired control pressure in Pa. For each digit of the target
pressure value press the up/down keys to set the digit then press ENTER to accept and move to the next digit or
CANCEL to move back to the previous digit. Pressing ENTER at the end of the line will accept the new setting.
Pressing CANCEL at the start of the line will cancel and exit back into the PID menu.
The PID target pressure set point can also be configured using a voltage signal. For further details please contact
Edwards.
A2.11.6 Test the PID control
1. If the booster is under manual control, ensure that it is switched on and running.
2. Turn Green Mode off from the Command menu.
3. PID should now start automatically. If it does not start to control the inlet pressure use the PDT and go to
Setup / Command / PID / On.
A2.11.7 Auto tune the PID
PID Auto Tune should not be used.
A2.11.8 Manually tuning the PID
Use the following default PID parameters:
Tc = 1
Kc = 0.01 (increasing the value results in a faster time to target pressure. 0.02 is generally the largest value required)
Ti = 50 (decreasing the value results in a faster time to target pressure. 20 is generally the smallest value required)
Td = 0.0001
Do not change Tc or Td
PID parameters are accessed using the PDT – go to Setup / Set sequences / PID / PID parameters.
A2.11.9 Turning PID on and off when on-process
The MCM MicroTIM or the PDT can be used to turn PID on and off when the pump is on-process by configuring the PID
to manual operating mode. This can be useful when a pump down to base pressure is required before pressure control
is initiated.
1. From the PID menu, select Operating mode...
2. From the Operating mode menu, select Manual.
Refer to the MCM MicroTIM manual and Appendix A2.14 for information about using the MCM MicroTIM to enable PID.
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