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Disconnect all power supplies before making electrical connections to prevent severe injury or death.
Product should be installed by a certified electrician to avoid electrical shock or bodily injury.
Warnings for spark hazards, not being ignition protected, and the need for adequate ventilation.
The cooling fan speed is controlled by the current drawn by the applied load for optimal cooling.
The unit automatically shuts down if internal temperature exceeds a critical point for component protection.
Output current stays constant, while voltage drops if it exceeds the maximum rating.
Voltage output drops to zero volts during a short circuit condition, resuming upon removal.
Fuses protect the circuitry from permanent damage caused by incorrect battery polarity connection.
Evaluates battery type to select the appropriate charging program for optimal performance.
Maximizes battery life using Bulk, Absorption, and Float charging modes.
Provides a constant 13.6V output to power RV circuits and maintain charge.
Delivers 14.4V for rapid charging, active until current drops or timer expires.
Offers a trickle charge at 13.2V to maintain battery charge without overcharging.
Explains the two voltage output modes (Bulk and Absorption) for lithium batteries.
Boosts voltage to 14.6V for quick charging and balancing of lithium cells.
Maintains 13.6V to provide a safe operating voltage for all RV loads.
Procedure for checking converter output voltage using a voltmeter.
Inspects reverse polarity fuses for breaks or continuity issues.
Identifies an audible alarm indicating reversed AC neutral and lead wires.
Provides a visual guide to diagnose and resolve converter issues.
Detailed procedure for removing the Main Board Assembly (MBA) from the enclosure.
Confirms the product is UL-Listed and cUL-Listed (Canadian).
Details FCC Part 15 rules for digital devices and potential radio frequency interference.
Refers to page 10 for complete removal and installation instructions of the MBA.
Lists conditions and actions that void the warranty, such as unauthorized repair or misuse.
Outlines the steps for filing a warranty claim, including obtaining an RGA number.
Provides contact details for dealers, OEM, and Arterra Distribution for warranty support.
The WF-8900-AD-MBA Series is a main board assembly designed for use in RV power centers, providing essential power conversion, distribution, and battery charging capabilities. This series includes several models: WF-8935-AD-MBA, WF-8745-AD-MBA, WF-8955-AD-MBA, WF-8965-AD-MBA, and WF-8975-AD-MBA. The specific model number of the power center is typically found on the front panel label near the breakers.
The primary function of the WF-8900-AD-MBA Series is to convert AC shore power into DC power to operate 12-volt RV appliances and charge the house battery. It integrates a smart battery charging system, circuit protection features, and various safety mechanisms to ensure reliable and safe operation within an RV environment.
The WF-8900-AD-MBA Series operates with an input voltage range of 105-130VAC at 60Hz. Output specifications vary by model:
All models feature automatically controlled, microprocessor-driven charging. They boast a VA Efficiency of >80% (under 70% of load condition) and a regulation accuracy of ±1% against input or load changes.
Dimensions and Weight:
The units are designed for non-condensing environments and are UL458 and FCC Class B compliant.
Automatic Cooling Fan: The cooling fan is load-controlled, meaning its speed increases as the current drawn from the converter to the load increases, and decreases as the load decreases. This design provides better component cooling by avoiding temperature spikes, which can lead to premature component failure.
Auto Detect Charging: This exclusive feature evaluates the charging cycle of a battery, determines the battery type (Lead Acid, AGM, or Lithium), and then selects the appropriate charging program (profile) for optimal performance and maintenance.
Three-Stage Smart Charging (for Lead Acid and AGM batteries):
Two-Stage Smart Charging (for Lithium batteries):
Electronic Current Limiting: If the output current exceeds the maximum rating, the output current remains constant while the output voltage drops. The unit recovers once loads are reduced.
Short-Circuit Protection: In the event of a short circuit, the converter drops the output voltage to zero volts. It resumes normal operation once the short-circuit condition is removed and no other faults are detected.
AC Reverse Polarity (Audible Alarm): The power center is equipped with an audible alarm that sounds if the incoming AC neutral wire and lead wire are connected backward, continuing until corrected.
Over-Temperature Protection: If the internal temperature exceeds a critical point, the converter will shut down to protect sensitive components from damage. It restarts once the temperature drops.
Reverse Battery Protection: Two reverse polarity fuses protect the MBA circuitry from permanent damage if a battery is connected backward. These fuses are located along the left-center edge of the DC fuse board below the VCC+ lug. Fuse values vary by model:
Troubleshooting Instructions:
Replacing the Converter Section (MBA):
General| Brand | WFCO |
|---|---|
| Model | WF-8900-AD-MBA Series |
| Category | Power Supply |
| Language | English |
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