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XFR824A Other Names:
XFR824A Input/Output Module
XFR824A Analog Module
XFR824A Digital Module
The HONEYWELL XFR824A is a Panel bus relay output module for the Honeywell Excel 800 control system. Designed specifically for HVAC (heating, ventilation, and air conditioning) systems and energy management, it offers high performance, flexible configuration, and system integration capabilities.
System: Excel 800 open platform, compatible with Panel bus and LonWorks bus I/O modules, interoperable with systems such as Excel 500, and supports integration with third-party controllers (such as Excel 10/12 room controllers).
Technical Specifications and Features
Electrical Parameters:
Output Type: 6 relay outputs, supporting 24V DC or 19-250V AC power.
Load Capacity:
Total Load: 12A at 19-250Vac, 12A (resistive)/3A (inductive) at 1-24Vdc.
Normally Open Contact: 4A (resistive/inductive) at 19-250Vac, 4A (resistive)/1A (inductive) at 1-24Vdc.
Normally Closed Contact: 2A (resistive)/1A (inductive) at 19-250Vac, 2A (inductive)/1A (inductive) at 1-24Vdc.
Minimum Load: Power >50mW.
Total Current: 12A (resistive load), 3A (inductive load).
Single contact: Normally open contact maximum 4A (AC/DC), normally closed contact maximum 2A (AC/DC); minimum load requirement >50mW.
Safety Features: Output hold/off/on status configurable in case of communication failure; LED flashes in manual override mode.
Interface Design: Utilizes the XS824-25 terminal block, supporting plug-and-play installation. The module and base are separated for easy live maintenance.
Fault Handling: Configurable output safe positions (hold/off/on) in case of communication failure.
Installation and Maintenance: Plug-and-play design supports hot swapping, allowing module replacement without powering down the network. The base is separated from the electronics module, allowing base installation to be completed before wiring, improving efficiency.
Installation and Configuration Features
Physical Installation: DIN rail mounting. The module and base are quickly connected via a connecting bridge. Wiring utilizes plug-in terminals, making installation five times faster than traditional methods.
Address Setting: Manually set the module’s physical address using hexadecimal switches. Debugging is automatically performed by the controller.
Software Features: Supports programming with the Excel Care tool and compatible with application library solutions; module software automatically updates, and LED indicators display status information.
Expandable Capabilities and Accessories
Module Combinations: Compatible with analog input/output, digital input, and floating-point output modules (such as the XF821A/XFL821A analog input and the XF822A/XFL822A analog output), supporting mixed I/O configurations.
Optional Accessories: Terminal block disconnect module (XS812-RO), cross connector, and rotatable label plate enhance wiring flexibility and ease of maintenance.
Network Communication: Supports Panelbus and LonWorks standards, enabling web access via C-Bus or OpenViewNet devices, and is compatible with protocols such as BACnet/OPC.
Expandable Capabilities:
Can be combined with Excel 800 Panelbus or LonWorks bus I/O modules, supporting up to 16 I/O module combinations, suitable for HVAC, energy management, industrial control, and other scenarios.
Compatible with third-party LonWorks devices, enabling remote web services via C-Bus or OpenViewNet.
Application Scenarios
Building Automation:
HVAC system control (e.g., freely programmable control of heating, ventilation, and air conditioning), optimizing start/stop, nighttime air supply, and load demand.
Integrated into systems such as Excel 500/10/12 for building energy management and equipment status monitoring.
Industrial and Specialty Scenarios:
Industrial process control (e.g., speed regulation of pumps, fans, and compressors), resource extraction (precise control of drilling rigs and pumping equipment).
High-reliability scenarios such as rail transit traction systems and aerospace power control.
Repair and Maintenance Guide
Common Troubleshooting:
Electrical Faults: Check for oxidized terminals and blown fuses. Use a multimeter to test the rectified voltage (normally 310V) and the output of the power management chip.
Communication failure: Reseat the DB9 connector cable, test the TX/RX line resistance to ground (should be >100kΩ), and check for damaged insulation.
Module replacement: Hot-swap operation is supported. After replacement, the Excel 800 controller automatically updates and configures the software.
Summary
As the core I/O module of the Excel 800 system, the XFR824A, with its high load capacity, flexible configuration, hot-swap maintenance, and system compatibility, is an ideal solution for HVAC automation and energy management. It is suitable for industrial and commercial scenarios with high requirements for reliability, scalability, and remote management.
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