Electronics International VA-1A User Manual

Page 16

13. Ground Test:

VA-1A Installed in the Battery Lead

VA-1A Installed in the Battery Lead - With the master on and the engine off, the discharge light should be
on, the Volts position will read 11.9 to 12.5 volts (23.8 to 25 volts for a 24 volt system) and the Amps
position should read -2.0 to -10.0 amps depending on your current load for the aircraft. Changing the load
will change the amps reading.

With the master on and the engine on, all lights will be off, the Volts position will read 13.2 to 14.8 volts

(26.4 to 29.6 for a 24 volt system) and the Amps position will read 5.0 to 15.0 amps and reducing rapidly
(shows battery charging current). Changing the load will not change the amps reading. See the operating
section of this manual for further details.

VA-1A Installed in the Alternator Lead

VA-1A Installed in the Alternator Lead - With the master on and the engine off, the discharging light will
be on, the Volts position will read 11.9 to 12.5 volts (23.8 to 25 volts for a 24 volt system) and the Amps
position should read 0.0 amps +/- .2 amps. Changing the load will not change the amps reading.

With the master on and the engine on, all lights will be off, the Volts position will read 13.2 to 14.8 volts

(26.4 to 29.6 for a 24 volt system) and the Amps position will read 5.0 to 25.0 amps and reducing rapidly
(shows battery charging current plus load current for the aircraft). Changing the load will change the amps
reading. See the operating section of this manual for further details.

TTroubleshooting

roubleshooting

If your VA-1A or VA-1A-XX has a problem, perform the following troubleshooting suggestions in the order
listed below:

1. Volts Read Incorrectly:

Connect only the red and black lead (all other leads must be open). The unit must read correct voltage on the
Red lead. Check for poor connections on the red and black lead. You may have a problem with the unit.

2. Amps Read Incorrectly:

A. Check that the red and black leads have good connections.

B. For a VA-1A (internal shunt unit), connect only one of the shunt leads on the back of the unit to the bus.
(The other lead should be open). The unit must read 00.0 (+/-.3) Amps.

C. For a VA-1A-XX (external shunt unit), connect both shunt leads (orange and brown) to the bus or one
side of the shunt. The unit must read 00.0 (+/- .3) Amps. A poor connection in the orange or brown lead

Installation Instructions

12. Ground Test: