My VFD has arrived and I got the 3 phase well pump running, driven by solar / lion battery. The VFD gives the pump a soft start, which works good. The pump has a water pressure switch build in, so that when 5 bars is reached, the pump disconnects the power line. When water is used and water pressure falls below 4 bars, the power is reconnected. Problem is that this reconnect creates a huge peak current which causes the battery manager to disconnect the battery. (So far I've only build one of the 6 battery packs.)
I'm looking for a way to setup the vfd so that it will soft start when pump reconnects. I've come up with several ways that did not work.
1) Set "U0-65: Upper torque limit".
Problem is that battery manager disconnects faster than the VFD is able to limit the current.
2) Turn down the max voltage and frequency. (The relation between the two is currently linear. This can be changed.) The minimum voltage/frequency needed to reach 5bar is 175V/39Hz. Setting this as max values, still triggers the battery protection when pump reconnects.
3) Make the VFD stop when pump disconnects. Then restart at some time later. Either after a time delay or at load detection. I haven't figured out the settings to do the resume. The settings I have done is:
p9-49 Fault protection action Load becoming 0, Err30: 2 Continue to run at 7%, resume to set frequency if load recovers (This setting seems to do nothing)
p9-63 protection on load becoming 0: 1 enable (If this is not set, the output stays at set voltage and frequency when pump disconnects, no error is displayed)
p9-09 fault auto reset times: 20 (This seems to do nothing)
p9-11 fault auto reset delay: 25.0s (This seems to do nothing)
To my mind, if either of p9-49 or {p9-09 and p9-11} did what the instructions say, my problem would be solved. I suspect that there is a setting somewhere that needs to be set in order for the others to take effect. (That has been the case with other settings I've done.) Does anyone have an idea of what that could be?
The vfd in question is the Nflixin 9600 2.2kw
http://nflixin.com/en/?p=103
Function list as pdf is too large for file upload. It can be found in the download section of the nflixin website.
I'm looking for a way to setup the vfd so that it will soft start when pump reconnects. I've come up with several ways that did not work.
1) Set "U0-65: Upper torque limit".
Problem is that battery manager disconnects faster than the VFD is able to limit the current.
2) Turn down the max voltage and frequency. (The relation between the two is currently linear. This can be changed.) The minimum voltage/frequency needed to reach 5bar is 175V/39Hz. Setting this as max values, still triggers the battery protection when pump reconnects.
3) Make the VFD stop when pump disconnects. Then restart at some time later. Either after a time delay or at load detection. I haven't figured out the settings to do the resume. The settings I have done is:
p9-49 Fault protection action Load becoming 0, Err30: 2 Continue to run at 7%, resume to set frequency if load recovers (This setting seems to do nothing)
p9-63 protection on load becoming 0: 1 enable (If this is not set, the output stays at set voltage and frequency when pump disconnects, no error is displayed)
p9-09 fault auto reset times: 20 (This seems to do nothing)
p9-11 fault auto reset delay: 25.0s (This seems to do nothing)
To my mind, if either of p9-49 or {p9-09 and p9-11} did what the instructions say, my problem would be solved. I suspect that there is a setting somewhere that needs to be set in order for the others to take effect. (That has been the case with other settings I've done.) Does anyone have an idea of what that could be?
The vfd in question is the Nflixin 9600 2.2kw
http://nflixin.com/en/?p=103
Function list as pdf is too large for file upload. It can be found in the download section of the nflixin website.
