Ticking noise

This question is aimed at Roger but if someone else knows the answer, feel free to chime in.

I just picked up a pair of used 6100s (black housing versions) and they are on alternate schedules making waves via an Apex. I have the Apex profile set to:

Code:
sync: false
divide by 10: true

initial delay: 0
on time: 5
off time : 2
min intensity: 0
max intensity: 60

I have also run it as:

Code:
min intensity: 30

because of the recommendation to stay above 30% but the wave form is cleaner and there is no noise when run at:

Code:
min intensity: 0

When run at:

Code:
min intensity: 30

the wave form is not as nice and there is the deep humming/ramping sound leading me to want to run them at

Code:
min intensity: 0

but while one of the pumps handles this well, the other makes a clicking sound when running at

Code:
min intensity: 0

but not at

Code:
min intensity: 30

My questions are:

  • Is it OK to run them at min intensity: 0 in this profile ?
  • Why does one pump do this silently but the other clicks?
  • Is there a part that needs to be replaced on the clicking pump?

Thank you
 
Try checking the impeller and magnet assembly of the clicking pump. If it has this 6080.6 version then it should be replaced with this newer 6100.7.

As for the question about the minimum intensity, the pumps should not be run at any speed between 0 and 30%. When used with our controllers to make a wave, the pumps are not ramped up or down; they are turned on and off. But I'm afraid I don't know enough about Apex programming to understand exactly what that profile is asking the pumps to do.
 
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