ACH 550 PID Setup Using Assistants Mode

There are two modes available in ACH550 ABB drive , you can configure PID Set up either through Assistant mode or going into one by one parameter setting , in this post we will discuses ACH 550 PID Setup Using Assistants Mode and in the next post we will configure the same setup without assistant mode.

This can be done using any application macro. The most common macro we use is the

HVAC Default macro.

1. Go to the assistants mode.

2. Scroll down to the PID Control area…There is a PID Flow area below this. It will

not be covered here.

3. Press select…this enters the assistants area

4. The drive will ask…Do you wish to use the ACH 550 PID controller…press o.k.

5. The drive will state “Select setpoint source:” You can set this to either Keypad or

Internal. INTERNAL is recommended over KEYPAD as keypads can fail. If this

is used then use 4011 for the internal setpoint

6. The drive will state ”On the next screen select the transmitter’s measurement

units”….press o.k.

7. 4006 Units will be set to inH2O...press save

8. 4007 Unit Scale 1….press save

9. The drive will state…On the next two screens select the transmitter’s output

range…press o.k.

10. 4008 0% Value will be set to inH2O. Set to minimum transmitter value

11. 4009 100% Value will be set to 300.0inH2O. This will need to be lowered. Set to

maximum transmitter value

12. 4011 Will ONLY appear if you have selected INTERNAL as Set Point Sel. It will

be set at 40 inH2O Change this as desired. (Usually start at about half of

transmitter range)

13. The drive will ask…Is your transmitter’s output 4-20mA (2-10V) ?...press o.k.

14. The drive will state…As feedback increases drive speed should: …will be set to

decrease…press o.k.

15. The drive will ask…Do you want to change PID tunings?...If you want to change

any settings, press o.k….You will then have the opportunity to change ramp

times, Gain, etc.

16. 4001 GAIN will be set to 2.5…press save. This normally would not need to be

changed (If a change is desired change in SMALL increments. This parameter

relates to the amount of change in the PI controller. If it is adjusted too high or too

low an unstable PI response will occur)

17. 4002 Integration Time will be set to 3.0s…press save. This normally would not

need to be changed (If a change is desired change in SMALL increments. This

parameter relates to the timeframe in which the amount of change occurs in the PI

controller. If it is adjusted too high or too low an unstable PI response will occur)

18. 4003 Derivation Time will be set to 0.0s…press save. This parameter normally

would not need to be changed.

19. 4004 PID Deriv Filter will be set to 1.0s…press save. This parameter would

normally not need to be changed.

20. 2202 Acceler Time 1 will be set to 30.0s…A longer acceleration time will make

a slower more smoothly responding PI control. A shorter time will make a quicker

less smooth responding PI control.

21. 2203 Deceler Time 1 will be set to 30.0s…A longer deceleration time will make

a slower more smoothly responding PI control. A shorter time will make a quicker

less smooth responding PI control.

22. USE THE NEXT AREA ONLY IF YOU ARE USING A SLEEP

FUNCTION…..OTHERWISE SIMPLY EXIT THE PID SETUP

ASSISTANT

23. The drive will ask…Do you want to use the sleep function?...press o.k.

24. 4023 PID Sleep Level….Set to any value just above what minimum speed would

normally be…such as 21-24 Hz for a pump application and 16-19Hz for a fan

application.

25. 4024 PID Sleep Delay…Set to what is desired…A lower number if pressure is

met quickly does not hunt and holds…a higher number if not…this is in seconds

26. 4025 Wake-up Dev…This is looking at a deviation from set point for the drive to

wake up

27. 4026 Wake-up Delay….This would normally not need to be changed unless a

delay is wanted…I usually suggest it be left it alone

For pump applications the same above steps would be followed. The Units would need to

be changed to PSI and the corresponding parameters would need to be changed likewise.

When a negative value is required such as a vacuum system or negative static pressure

system, 4005 Error Value Invert would be used. This would be set to Yes….See step

#14.