Allen-Bradley 1404-M405A-DNT PowerMonitor 3000 Master Module

Configured for power quality sensing and system parameters in DeviceNet communication networks, the Allen-Bradley 1404-M405A-DNT (1404-M405A PowerMonitor 3000 Master Module) provides direct physical/electrical execution. The module functions as the central logic unit for real-time voltage, current, power factor, and harmonic energy calculations, interfacing direct line inputs with industrial network architecture.

Hardware Specifications

Network Communication & Deterministic Execution

The 1404-M405A-DNT module utilizes DeviceNet deterministic networks and firmware flash compatibility to ensure reliable high-speed data acquisition across industrial automation backplanes. Interfacing directly with current and potential transformers, the internal DSP executes high-resolution sampling algorithms to compile metering registers. Processed parameters are broadcast over the DeviceNet network trunk with microsecond-level latency, allowing Allen-Bradley ControlLogix or SLC 500 controllers to process power quality triggers without high processor polling overhead.

Frequently Asked Questions

Q: What is the primary procedure for updating the internal flash firmware on the 1404-M405A-DNT master module?

A: Firmware flash compatibility is supported via the DeviceNet network port using standard Rockwell Automation configuration utilities. Upgrades must be performed while the connected load monitoring channels are idle to prevent memory corruption or parameter table resets.

Q: How does the power supply stage handle input voltage switching between AC and DC sources?

A: The wide-range internal power supply automatically accepts 120-240 VAC or 125-250 VDC input terminals without manual jumper reconfiguration. Internal galvanic isolation barriers shield metering electronics from input power line transients.

Field Installation Guidelines

1. Mount the master module housing in a clean, dry, NEMA 12 or IP54-rated metal enclosure with adequate vertical clearance for thermal convection.
2. Connect field power wiring (120-240 VAC / 125-250 VDC) using copper conductors rated for at least 75 deg C, ensuring terminal screws are torqued to manufacturer specifications.
3. Attach the standard 5-pin DeviceNet network connector, verifying proper installation of 121 ohm end-of-line termination resistors at both physical ends of the trunk line.
4. Route high-voltage voltage sensing leads and Current Transformer (CT) secondary wiring in separate grounded conduit runs from low-voltage communication cables.
5. Bond the module chassis ground terminal directly to the main cabinet earth ground bus bar using a low-impedance braided strap (ground resistance less than 1 ohm).