VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 04-02-2016, 04:00 PM
MWDG3 MWDG3 is offline
 
Join Date: Apr 2016
Location: Owasso, OK
Posts: 11
Default EMS-D120 amp indication issue

A local RV9A is having erroneous indications on his Dynon EMS D120. Amp indication has been -3 to -10 in the past, but never as high as yesterday. Voltage has always indicated 13.8-13.9v. I noticed thru search, a few indication problems reported here over the years. Any input from the membership would be greatly appreciated.

Reply With Quote
  #2  
Old 04-02-2016, 09:25 PM
GalinHdz's Avatar
GalinHdz GalinHdz is offline
 
Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 1,361
Default

If everything appears to be working correctly but the indication is way off, check all the connections from the unit to the shunt.

__________________
Galin
CP, ASEL, AMEL, IR
St. Augustine, FL
www.puertoricoflyer.com
Reply With Quote
  #3  
Old 04-03-2016, 06:41 AM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,523
Default

Where is the shunt located? There are 3 possible functions: measure battery current, measure alternator current, or measure aircraft load current. In any case, a normally negative indication is caused by the two small shunt wires being reversed.
Unusually large current indication is caused by corrosion on the large terminals of the shunt. I suggest that the large cable terminals on the shunt be disassembled, cleaned, and reassembled.
__________________
Joe Gores
Reply With Quote
  #4  
Old 04-03-2016, 01:53 PM
MWDG3 MWDG3 is offline
 
Join Date: Apr 2016
Location: Owasso, OK
Posts: 11
Default

I'll have to find it next time I'm over there. Thanks for the input.
Reply With Quote
  #5  
Old 08-10-2017, 05:26 PM
Low Pass's Avatar
Low Pass Low Pass is offline
 
Join Date: May 2006
Location: Houston
Posts: 1,858
Default Also beginning to have bad current indications...

Has anyone experienced problems with the D120 or possibly D180 regarding current indication? Shunt checks out, leads check out, all connections clean.

Checking for possible unknown solutions before removing and shipping off to the factory for service...
__________________
Bryan

Houston
Reply With Quote
  #6  
Old 08-10-2017, 07:35 PM
DennisRhodes DennisRhodes is offline
 
Join Date: Jul 2007
Location: Taylorsville, Ga
Posts: 523
Default

Search a thread titled "help trouble shoot an electrical gremlin started by DennisRhodes. Prob find your issue.
__________________
DRRhodes
2017 VAF dues paid
RV9 N908DR
Reply With Quote
  #7  
Old 08-10-2017, 09:29 PM
MWDG3 MWDG3 is offline
 
Join Date: Apr 2016
Location: Owasso, OK
Posts: 11
Default

Original post required factory repair of the D120.
__________________
www.pinpointharnessing.com
Reply With Quote
  #8  
Old 08-10-2017, 10:30 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 2,523
Default

My D-180 ammeter has never displayed the correct current. Several other RV-12 owners have the same problem with their D-180s. To rule out a problem with the aircraft wiring, I put a jumper across the D-180 ammeter terminals. The display should be zero, but it is not. The ammeter display is still erratic. I only pay attention to the voltage.
__________________
Joe Gores
Reply With Quote
  #9  
Old 08-11-2017, 08:32 AM
Low Pass's Avatar
Low Pass Low Pass is offline
 
Join Date: May 2006
Location: Houston
Posts: 1,858
Default

Thanks for taking time to reply. Guess these units can have issues - mine have worked flawlessly for many years. Now to find a time to take the plane down for a few weeks to ship it off to the factory...
__________________
Bryan

Houston
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 11:43 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.