Cessna Part

R25400

$439.00

28V Electronic Alternator Controller

SKU: ZA0005.

Product Description

28V Electronic Alternator Controller

What’s included:

  • Installation Drawing
  • Warranty Card
  • Product Eligibility Catalog (PEC)
  • Troubleshooting Notes
  • STC Certificate
  • Instructions For Continued Airworthiness Maintenance (ICA)

Product Features:

Voltage Regulation, IC voltage reference

The Regulator keeps the bus voltage constant by controlling the alternator’s field current: increasing it when the system load increases and decreasing it when the load decreases.

Remote Voltage Sensing

By sensing the alternator’s battery terminal voltage, the ACU provides better voltage regulation and eliminates flickering charge‐meter and panel lights.

Low & Over Voltage Sensor /Indication

The LV warning light connected to pin 4 comes ON when the alternator drops off‐line, the bus voltage drops below the LV level, power to pin 3 is turned off, or the OV trips the ACU off ‐line.

Field‐to‐Ground Fault Protection (GFP)

If the alternator’s field shorts to ground, the field‐to‐ground short protector deactivates the Voltage Regulator and switches on the unit’s Trouble‐Shooting Light (TSL) red and the aircraft’s LVI.

Trouble‐Shooting Light (TSL)

The TSL (on the unit) is designed to alert the user to the condition of the Alternator / ACU system.

Over‐Voltage Protection

To protect sensitive avionics equipment and the battery, the OV protector turns off the Regulator and the alternator if the bus voltage exceeds 32V.

Other Features:

  • Increased Regulator life
  • Not temperature sensitive
  • Improved Voltage Regulation
  • Reduced panel light flicker
  • Improves safety—Warns of Low voltage & OV condition
  • Protects against grounded alternator field
  • Identifies grounded field
  • Reduce trouble‐shooting time
  • Protects system loads against overexcited alternator

Additional Information

Weight .3 lbs
Model Number
Voltage Reg. (VR)
Max Field Current
Over Voltage (OV)
Low Voltage Trip (LVI)
Approval Type
Document Approval
OEM PN: (Cessna)
Replaces OEM PN (MOONEY)
OEM PN (Electrodelta)
OEM PN: (PFT)
Aircraft Common Name
Approved Aircraft

Warranty Policy

Click the links below to download warranty policy in .pdf format.

Warranty Policy (New Manufactured) PDF Requires Acrobat Reader

Warranty Policy (Recertified) PDF Requires Acrobat Reader

Cross Reference

Click the links below to download info in .pdf format.

Voltage Regulators for Alternator Systems

14V Alternator Controller Units (ACU) Cross Reference PDF Requires Acrobat Reader

28V Alternator Controller Units (ACU) Cross Reference PDF Requires Acrobat Reader

Single Engine Voltage Regulators for Generators 12A - 50A

14V Single Engine Generator Controller Units (GCU) Cross Reference PDF Requires Acrobat Reader

Twin Engine Voltage Regulators for Generators 35A - 50A

14V Twin Engine Generator Controllers Units (GCU) Cross Reference PDF Requires Acrobat Reader

28V Twin Engine Generator Controller Units (GCU) Cross Reference PDF Requires Acrobat Reader

Over-Voltage Protection Sensors/Relays For Alternator Systems

16V Over-Voltage Relays/Sensors (OVS/OVR) Cross Reference PDF Requires Acrobat Reader

32V Over-Voltage Relays/Sensors (OVS/OVR) Cross Reference PDF Requires Acrobat Reader

Equalizer (EQ) or Parallel Relay for Twin Engine Generator Systems

14V Twin Engine EQ Parallel Relay Cross Reference PDF Requires Acrobat Reader

28V Twin Engine EQ Parallel Relay Cross Reference PDF Requires Acrobat Reader

FAQ

Click the links below to download the .pdf

Connectors

Product Connector FAQ PDF Requires Acrobat Reader

General Product

GCU Cross Reference (Coming Soon)

ACU Cross Reference (Coming Soon)

OVR, OVS, Cross Reference (Coming Soon)

How To

How To Read the Cross Reference Chart FAQ (ACU) PDF Requires Acrobat Reader

How To Read the Cross Reference Chart FAQ (GCU) PDF Requires Acrobat Reader