Yokogawa NM6*D Power Supply Module

The Yokogawa NM6*D, also cataloged as the NM6 Power Supply Module, operates as a dedicated hardware component for primary DC power regulation and backplane bus distribution within Yokogawa CENTUM DCS racks. The unit converts incoming power sources into regulated DC voltages, feeding power directly to controller cards and I/O subrack buses.

Suffix Breakdown & Model Matrix

Hardware Specifications

Channel-to-Channel Isolation and DCS Power Regulation

The NM6*D power supply module provides regulated DC power output while filtering line transients and switching noise across the subrack. Galvanic isolation barriers decouple input power connections from backplane logic rails, protecting downstream analog and digital I/O cards—including 4-20 mA HART loop protocol field interfaces—from overvoltage events. Built-in overcurrent and short-circuit protection circuits clamp output voltage during fault conditions, preventing power disturbances from propagating to central processor modules.

Frequently Asked Questions

Q: How does the NM6*D respond to output short-circuit conditions?

A: The module activates integrated short-circuit protection circuitry, clamping or shutting down output rail voltage to prevent physical damage to connected backplane circuits until the fault is removed.

Q: What grounding procedure is required to minimize output switching noise?

A: Ground the module chassis frame directly to the main cabinet functional earth (FE) bus bar using low-impedance copper conductors to optimize noise filtering and transient suppression.

Q: Is the NM6*D module hot-swappable in a live control rack?

A: Hot-swapping is permitted only in dual-redundant power configurations where the secondary parallel power supply module actively supports the entire backplane current load.

Field Installation Guidelines

1. Chassis Alignment: Slide the NM6*D module into the designated power slot of the CENTUM rack chassis, ensuring guide rails align properly before seating the rear backplane connectors.
2. Fastener Engagement: Tighten top and bottom retaining screws to secure the 300 mm x 150 mm x 70 mm chassis against industrial vibration.
3. Wiring & Isolation: Separate primary input power lines from low-voltage field communication cabling in wire ducts to prevent electromagnetic noise coupling.
4. Thermal Clearance: Maintain clear ventilation channels above and below the module assembly to allow heat sink dissipation and keep ambient operating temperatures within 0 to 55 deg C.