Atlas Copco Blower ZE3 Wont say in standby mode

by Abe
(Saskatchewan, Canada)

Some up front info:

- These blowers (or compressors) discharge into a common header.
- Check valves pass, so when there is one blower running, loads/unloads, the displays of the others indicate the pressures as the one loading/unloading, even if they are off.
- I know a whole lot of nothing inregards with compressors/blowers.


So this is what I got:

1) ZE3E 101 hp--> Pressure Band Regulation is (35psi-41psi)
2) ZE4D 189 hp-> out of service
3) ZE185 194 hp--> Pressure Band Regulation is (31psi-38 psi)

Here is my problem

Blower #3 (ze185 - 194hp) is running. loading and unloading.

(Problem)
-->Blower #1 (101 hp) I want in standby, it does go into stand by, but when the larger blower (#3) unloads, it causes this blower to start up.

The regulation (Pressure band) works fine on #1, when it runs alone, it will load and unload at 31psi-38psi, but when it is running with blower #3, and blower #3 unloads, #1 will start up, even when the display indicates a pressure in #3 of 35psi.

Shouldn't blower #1 be in standby and only start when the pressure reaches 31psi? how could it be starting at 35 psi?

Comments for Atlas Copco Blower ZE3 Wont say in standby mode

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Feb 21, 2018
standby
by: Doug in s.d.ca.

If what you wrote is correct (as to the pressure bands), then that's exactly what I would expect, barring some other controller setting(s).

You give:
1) ZE3E 101 hp--> Pressure Band Regulation is (35psi-41psi)
2) ZE4D 189 hp-> out of service
3) ZE185 194 hp--> Pressure Band Regulation is (31psi-38 psi)

If you want to maintain say 31 to 38 psi, and you don't want #1 to run unless #3 cannot keep up with demand, then you'd want to set it them up thusly:

1) ZE3E 101 hp--> Pressure Band Regulation is (31psi-37psi)
2) ZE4D 189 hp-> out of service
3) ZE185 194 hp--> Pressure Band Regulation is (32psi-38 psi)

Make sense?


Feb 21, 2018
Pressure bands
by: Carl

Hi,
So, if you want #1 to be in standby you need to swap the pressure settings around to exactly opposite on both Blowers/Compressors on the controllers

Why do you have different top pressures? (41 and 38psi) why not have both the same and if you want to swap the lead machine then whichever you have the lower pressure then that will be the standby.

I do have to say that 7psi differential (the difference between onload and offload) is very tight so by the time it comes to going back onload and actually making air, it could drop lower and making the standby come on too quickly, or do you find them going onload and offload alot? Might be worth widening that differential a bit?

Does that help?? What controllers do you have on the machines? Elektronicon I? II?

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