Electronics International VA-1A User Manual

Page 17

will cause only the Amps reading to wander around. Check for poor connections (pull on each wire at the
back of its connector). Check the fuses and fuse holders. Check that the signal shunt leads do not supply
power to any other piece of equipment.

3. Discharge Warning Light Works Incorrectly:

Check that the 12/24 Volt Select Switch on the back of the unit is set properly. The Discharge Warning
Light will be on when the bus voltage (on the Red wire) drops below 12.6 volts (25.2 volts for a 24-volt
system).

4. High Volts Warning Light Works Incorrectly:

Check that the 12/24 Volt Select Switch on the back of the unit is set properly. The High Volts Warning
Light will be on when the bus voltage (on the Red wire) exceeds 15.3 volts (30.6 volts for a 24-volt system).

5. Back Light Works Incorrectly:

On a 12-volt system, the 24 volt line must be grounded. See the Wiring Diagram. Check for poor connec-
tion on the backlight wires (white/brown and white/red).

6. Bench Test the Instrument:

To bench test the VA-1A or the VA-1A-XX connect one lead of the internal shunt (or both the orange and
brown leads for the VA-1A-XX) to the red lead and connect all of them to a power supply (7 to 40 volts).
Connect the black lead to ground. The unit must read 00.0 (+/- .3) Amps and proper voltage.

Troubleshooting