A77 BATTERY CHARGER Microprocessor Controlled SCR Technology

The La Marche Model A77 Series Battery Charger is engineered for the demanding requirements of Switchgear, Process Control, Oil Exploration and other stationary DC power applications. The A77 can automate NERC PRC-005 & TPL-001 Compliance. Powered by Microprocessor Controlled SCR technology, the A77 Series Battery Charger / Battery Eliminator has ±0.25% DC voltage regulation from no load to full load over the specified input voltage, frequency and ambient temperature ranges. These chargers are available in DC output voltages of 24, 48, 130, and 260 VDC with DC output currents from 6 amps and above. Consult factory for any special input and output requirements not mentioned above. The La Marche A77 charger provides value added features such as AC/DC breakers, easy to read LCD display with text readout alarm LED’s and form “C” alarm contacts. Communication options are avail- able to remotely monitor and control the charger using DNP3, Modbus, IEC 61850 and SNMP protocols. The SNMP option features easier and faster charger setup and configuration using a web browser. Designed to meet IEEE-2405 & NEMA PE5, and listed to UL 1012.

    • Magnetic Amplifier Technology
    • Microprocessor Controlled SCR Technology
    • A77D – Level-1 Filter *
    • A77DE – Level-2 Filter **
    • Automatic AC Voltage Compensation
    • AC & DC Surge Protection (MOV)
    • AC & DC Breaker
    • Float / Equalize Mode Switch
    • Digital Float and Equalize Adjustments
    • Digital Current Limit Adjustment 50 to 110%
    • ±0.25% DC Voltage Regulation
    • Battery Continuity Test
    • Load Sharing
    • Remote Equalize
    • LCD Display
      • DC Voltage and Current
      • Alarms
    • Available for Lithium-Ion Battery configurations
    • LED Indicators
      • Float / Equalize
      • AC ON
      • Charger Failure
      • Overload / Current Limit
      • End of Discharge
      • High DC Voltage Shutdown
      • Positive & Negative Ground Detection
      • AC Failure
      • Summary Alarm
      • Low DC Current
      • Low DC Voltage
      • High DC Voltage
    • Remote Annunciation Form “C” Contacts
      • AC Failure
      • Summary Alarm

    (See Optional Accessories For Additional Alarm Contacts)

    • Alarms Latching / Non-Latching
    • Equalize Timer – adjustable from 1-255 hours with five selectable modes of operation (manual, automatic every 7, 14 or 30 days and equalize after sensing a low DC voltage)
    • Advanced Data Logging (Micro SD)
    • UL 1012, CUL, CE, IBC & ABS
    • NERC PRC-005 & TPL-001 Compliant
    • 5-Year Full Warranty
    • 10-Year Magnetics Warranty

APPLICATIONS

 

Switchgear Applications. Provides reliable DC power for switchgear operations, ensuring safe and efficient control of electrical grids.

 

Process Control Systems. Supports industrial automation and control systems, maintaining stable power for critical monitoring and process adjustments.

 

Oil & Gas Exploration and Refining. Ideal for offshore platforms, drilling rigs, and refineries where uninterrupted DC power is required for control systems and safety mechanisms.

 

Substation DC Power Systems. Ensures consistent DC power for substations, protecting relays, circuit breakers, and communication systems.

 

SCADA & Remote Monitoring Systems. Fully compatible with SCADA systems, allowing remote monitoring and control through DNP3, Modbus, IEC 61850, and SNMP protocols.

 

Utility & Power Generation Plants. Supports power plants and utilities by maintaining backup DC power for relays, turbines, and grid control systems.

 

Uninterruptible Power Supply (UPS) Systems. Acts as a reliable charger in DC UPS systems to provide backup power during outages.

 

Data Centers & Telecommunications. Powers critical network infrastructure, ensuring uninterrupted operation for telecom towers, base stations, and server rooms.

 

Railway & Transportation Systems. Provides backup power for railway signaling, track-side equipment, and communication networks.

 

Industrial Battery Charging & Backup Systems. Used in industrial facilities to maintain battery banks for emergency power and backup supply.

 

Renewable Energy & Energy Storage Systems (ESS). Supports renewable energy storage applications by charging and maintaining battery banks for solar and wind systems.

 

Marine & Offshore Applications. Suitable for vessels, offshore rigs, and naval defense systems requiring robust and reliable DC power sources.

 

Emergency & Backup Power for Critical Infrastructure. Provides continuous power to emergency lighting, security systems, and backup generators.

 

 

 

 

ADVANTGAES:

 

Microprocessor-Controlled SCR Technology. This advanced control system ensures precise and efficient power conversion, improving reliability and performance in demanding applications. It provides ±0.25% DC voltage regulation, meaning the output remains highly stable under varying loads, preventing damage to connected equipment.

 

 

Advanced Data Logging & Compliance with NERC PRC-005 & TPL-001. The built-in data logging capability on a micro SD card simplifies compliance with industry regulations. This feature enables detailed tracking of system performance, alarms, and events, supporting proactive maintenance and ensuring regulatory compliance without manual record-keeping.

 

 

Comprehensive Communication Protocols (DNP3, Modbus, IEC 61850, SNMP). The ability to remotely monitor and control the charger via multiple protocols allows seamless integration into modern SCADA and energy management systems. The SNMP option simplifies setup through a web browser, reducing configuration time and enhancing remote management capabilities.

 

 

Built-in Protection and Redundancy Features (AC/DC Breakers, Surge Protection, Load Sharing, Battery Continuity Test). The A77 is designed for maximum reliability, featuring AC/DC breakers, surge protection (MOV), and load-sharing capabilities. These safeguards protect both the charger and connected systems from electrical faults, improving uptime and ensuring operational stability.

 

 

Flexible Equalization Modes & Adjustable Timer. The charger includes a customizable equalization timer (1-255 hours) with multiple modes (manual, automatic every 7, 14, or 30 days, or triggered by low DC voltage). This ensures optimal battery maintenance, extending battery life and preventing capacity degradation over time.