Zef VR adjustment

[Let'sgoflying!]

R15V0N 12v
Noticed voltage is just a tad higher than the battery mfg recommends at these temps.
Appears to have an adjustment screw but I can’t locate any documents describing its use.





Anyone?

 

[Domenick]

https://zeftronics.com/contact-us/
903-758-6661

My guess is the external adjustment screw is under the round cover left of the label.

 

[Bell206]

I can’t locate any documents describing its use.

I usually contacted Zef support for the process and to verify if the particular model can be adjusted installed. Some need a bench adjustment. But may want to first check/clean all connections/wires for sensing/charging circuits and verify charge voltage at several point with a good meter. And if it still is reading too high for you perhaps a quick call to the battery support guys to see their input. Sometimes its best to adjust to a nominal charge voltage to handle the largest operating parameter vs recurring adjustments as the temp changes.

 

[Let'sgoflying!]

https://zeftronics.com/contact-us/
903-758-6661

My guess is the external adjustment screw is under the round cover left of the label.

that's actually a slot screw, I think it's the adjustment.
Surprised nothing on their site/manuals and really surprised prowling av forums no one has ever talked about it.

 

[Domenick]

that's actually a slot screw, I think it's the adjustment.
Surprised nothing on their site/manuals and really surprised prowling av forums no one has ever talked about it.

I checked the documentation on their site and the docs I have collected. I'm surprised too.
If it was me, I'd adjust the screw very slowly while monitoring bus voltage.
https://zeftronics.com/wp-content/uploads/2014/06/R15V0N-+-R25V0N-Zeftronics--1024x887.jpg
Note the adjustment hint on the right side of the label.

 

[Larry Korona]

I checked the documentation on their site and the docs I have collected. I'm surprised too.
If it was me, I'd adjust the screw very slowly while monitoring bus voltage.
https://zeftronics.com/wp-content/uploads/2014/06/R15V0N-+-R25V0N-Zeftronics--1024x887.jpg
Note the adjustment hint on the right side of the label.

Curious to see if the OP attempted to adjust the unit or not.

 

[Let'sgoflying!]

Curious to see if the OP attempted to adjust the unit or not.

Not yet, Larry
Dave

 

[Let'sgoflying!]

Zef tech says first check the v drop between bus and I.
If the difference is >0.2v (with engine off) check the connections at each end of the I wire.
If it is <0.2v I can adjust the slot screw on the face.
He was not sure which way to turn (if I need to, I will try CCW first)
He said it will be <1/4 turn needed. The usual output is regulated to 14.1v.

 

[Larry Korona]

Zef tech says first check the v drop between bus and I.
If the difference is >0.2v (with engine off).

I assume with the master switch (battery side of the split switch) on?

Thanks!

 

[Let'sgoflying!]

I assume with the master switch (battery side of the split switch) on?

indeed, Larry
I'll be trying it this weekend.

 

[Larry Korona]

Thanks!

I have the same unit in my C172, so I'm interested in learning about this adjustment.

 

[Let'sgoflying!]

Thanks!

I have the same unit in my C172, so I'm interested in learning about this adjustment.

Larry!
CCW was the wrong direction
I turned it out only an RCH (CCW direction) and the voltage went UP 0.1v.
I’m going to try it the other direction (CW) next flight.

 

[Let'sgoflying!]

@Larry Korona
CW = lower
1/32 turn = 0.1V

 

[Larry Korona]

@Larry Korona
CW = lower
1/32 turn = 0.1V

Thanks! Useful information.