Electronics International VA-1A Operating And Installation Instructions

Volts / amps (primary instruments)

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(VA-1A, VA-1A-XX & RSVA-3)

Operating and Installation Instructions

You must read this manual before installing or operating the instrument. This

manual contains warranty and other information that may affect your decision

to install this product and/or the safety of your aircraft.

Electronics International Inc.

63296 Powell Butte Hwy • Bend, OR 97701 • (541) 318-6060 • Buy-EI.com

Volts / Amps

(Primary Instruments)

OI 041032 and II 040934

S/N: ~74000 and up.

Model:

S/N:

S0224921

4/9/83

Rev. C: 2/24/92 ***

® ® ® ® ®

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Summary of Contents for Electronics International VA-1A

Page 1 Volts / Amps S0224921 (Primary Instruments) (Primary Instruments) (Primary Instruments) (Primary Instruments) (Primary Instruments) (VA-1A, VA-1A-XX & RSVA-3) (VA-1A, VA-1A-XX & RSVA-3) (VA-1A, VA-1A-XX & RSVA-3) (VA-1A, VA-1A-XX & RSVA-3) (VA-1A, VA-1A-XX & RSVA-3) Operating and Installation Instructions Operating and Installation Instructions...
Page 3 Check that the instrument make and model marked on the side of the instrument and on the invoice are correct before starting the installation. The VA-1A is an internal shunt unit and the VA-1A-XX is an external shunt unit (“XX” = your aircraft shunt value in amps).
Page 5: Table Of Contents
7. Route the Backlight Wires ....................... 12 8. Route the Shunt Wires (External Shunt Unit Only, VA-1A-XX) ..........13 9. Connect the Large Shunt Wires (Internal Shunt Unit Only, VA-1A) ........13 10. Install the Instrument in the Panel ....................13 11.
Page 6: Warranty
Electronics International Inc. 4. Electronics International Inc. is not liable for expenses incurred by the customer or installer due to factory updates, modifications, improvements, upgrades, changes, or any other alterations to the product that may affect the form, fit, function or operation of the product.
Page 7: Va-1A, Va-1A-Xx Operating Instructions
Features 1. 12/24 Volt Select Switch On the back of the VA-1A is a select switch to set the “High Volts” and “Discharge” warning features for a 12 or 24 volt system (see Installation Instructions). 2. “High Volts” Warning Light If the bus voltage rises to 15.3 volts (30.6 volts for a 24-volt system) or higher, a bright red “High...
Page 8: Va-1A Installed In The Battery Lead
With the Mode Switch in the “Amps” position, the VA-1A will display the electrical system load on the aircraft. Since the engine is off, all of the current is being supplied by the battery. The VA-1A will show a discharging condition (the “Discharge” light will be on) and display an accurate read- ing of the total current drain from the battery.
Page 9 If an improper reading is noted, the VA-1A may then be used to diagnose which piece of equipment has malfunctioned by checking each piece of equipment sepa- rately.
Page 10: Va-1A Installed In The Alternator Lead
With the Mode Switch in the “Amps” position the VA-1A will display 000 (+/- a few counts). Since the battery is supplying all of the electrical load and the alternator is off (not turning), there is no current being supplied from the alternator and the “Discharge”...
Page 11 If an improper reading is noted, the VA-1A may then be used to diagnose which piece of equipment has malfunctioned by checking each piece of equipment separately.
Page 12: Va-1A, Va-1A-Xx Installation Instructions
If your aircraft does not have an external shunt and you elect to install an external shunt, then order the VA-1A-50 and S-50 shunt (100 amp capability). For aircraft drawing more than 100 amps order the VA-1A-300 and an S-300 shunt (300 amp capability).
Page 13: Installation
2. Instrument Set Up On the back of the VA-1A is a hole allowing access to a small switch. The switch furthest to the right in this window sets the VA-1A for a 12 or 24 volt system. The other switches have no affect on the operation of the VA-1A.
Page 14 With the improvements made to the VA-1A there are few disadvantages using either method. Although EI’s test pilot has a slight preference for the alternator lead when using the VA-1A, ease of installation should be the determining factor. In most cases installing the VA-1A is a simple matter of replacing your existing unit and adding a few wires (see Wiring Diagram).
Page 15 Installation Instructions 3. Determine how the VA Unit will be installed Figure 2: VA-1A or External Shunt Installed in the Alterntor Lead This line may be connected to the Bus, Master Switch Contactor or the Alternator Starter Solenoid. VA-1A or External Shunt Reverse Current Diode.
Page 16: Install The External Shunt (External Shunt Unit Only, Va-1A-Xx)
Note: If you are replacing an existing ammeter, the shunt may already be mounted in the aircraft. If this is the case, you should have ordered a VA-1A-XX unit that matches your shunt. The external shunt should be installed in an appropriate location that minimizes the routing of main cables (refer to the wiring diagram in this manual appropriate for your installation).
Page 17: Route The Shunt Wires (External Shunt Unit Only, Va-1A-Xx)
If this unit is to be used with an RSVA-3 remote switch, see the RSVA-3 Installation section of this manual. 9. Connect the Large Shunt Wires (Internal Shunt Unit Only, VA-1A) Connect the large bus, battery or alternator leads (as appropriate for your installation) to the large lugs on the back of the VA-1 unit.
Page 18: Ground Tes
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 (+/-0.3) Amps.
Page 19: Troubleshooting
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 (+/- 0.3) Amps...
Page 20: Va-1A (Internal Shunt Unit) Wiring Diagram
Wiring Diagram Wiring Diagram Wiring Diagram W0225921 12/24 Volt Switch (Up for 24-volt system) (Down for 12-volt system) VA-1A Back Panel #4 Wire or larger. #4 Wire or larger. Circular Connector To Bus via 1 to 2 Amp Fuse. Black To Ground.
Page 21: Va-1A-Xx (External Shunt Unit) Wiring Diagram
Wiring Diagram Wiring Diagram Wiring Diagram Wiring Diagram W0225922 12/24 Volt Switch (Up for 24-volt system) (Down for 12-volt system) VA-1A-XX Back Panel Circular Connector To Bus via 1 to 2 Amp Fuse. Black To Ground. Wht/Brn To 12-Volt Bus (Open for 24-volt system).
Page 22: Va-1A And Va-1A-Xx Circular Connector
VA-1A and VA-1A-XX Circular Connector Wire Harness Connector, Back View (wire side) Instrument Connector, Front View Note: See Wiring Diagram for hook up information. Orng Brwn VA-1A-XX External Shunt Unit Only.
Page 23: Rsva-3 Installation Instructions
Installation Instructions Installation Instructions Installation Instructions The RSVA-3 switch is used in conjunction with a VA-1A-XX external shunt unit in a twin engine aircraft to monitor both alternator outputs and the battery charging and discharging currents. 1. Install the External Shunts Note: If you are replacing an existing ammeter, the shunts may already be mounted in the air- craft.
Page 24: Install The Rsva-3 In The Panel
RSVA-3 in the Battery Position the VA-1A-XX 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.
Page 26: Rsva-3 Circular Connector
RSVA-3 Circular Connector Wire Harness Connector, Back View (wire side) Note: See Wiring Diagram for hook up information.
Page 27: Specifications And Operating Features
Model: Model: Model: Weight: Weight: Weight: VA-1A ; 9 oz., VA-1A-XX ; 7.5 oz., S-50 (100 amp Shunt) ; 3 oz., S-300 (300 amp Shunt) ; Weight: Weight: 12 oz., RSVA-3 (External Select Switch) ; 3.5 oz. Power Requirements: Power Requirements: 7 to 40 volts, 2/10 AMP.

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Va-1a-xx Rsva-3

Electronics International VA-1A Operating And Installation Instructions

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