Emerson 396657-01-0 Power Supply/Sequencer Module (Industrial-Grade PSSM for ControlWave Micro)

The Emerson 396657-01-0 represents a mission-critical power management solution engineered specifically for ControlWave Micro remote terminal units operating in demanding industrial environments. This intelligent Power Supply/Sequencer Module (PSSM) transforms raw DC bulk power into precision-regulated +3.3 Vdc and +5 Vdc rails while simultaneously orchestrating system startup sequences, monitoring power quality, and providing real-time health diagnostics through integrated watchdog circuitry.

Designed for slot #1 installation in 3-, 4-, or 8-slot ControlWave Micro base housings, this module serves as both the electrical heart and system supervisor—ensuring stable operation across temperature extremes (-40 to +70°C), voltage fluctuations (10.7-30 Vdc input range), and hazardous industrial atmospheres (Class I Division 2 certified).

Core Features & Technical Advantages

✓ Wide-Range DC Input Acceptance (10.7-30 Vdc)
Accommodates both 12V and 24V nominal systems with jumper-selectable trip points, making it ideal for solar-powered remote sites, battery-backed installations, and industrial DC bus applications. Eliminates the need for multiple power supply variants across diverse deployment scenarios.

✓ Dual Regulated Output Rails
+3.3 Vdc main rail powers all backplane-connected I/O modules with tight voltage regulation, while the auxiliary +5 Vdc rail drives low-power detection circuits and sequencer timing logic. This dual-rail architecture ensures clean power delivery even during high-current transient events.

✓ Intelligent 1200ms Power Quality Detection
Advanced filtering circuitry distinguishes between momentary voltage sags (which are ignored) and sustained power anomalies (which trigger protective actions). This 1200-millisecond detection window prevents nuisance shutdowns in electrically noisy environments while responding rapidly to genuine power failures.

✓ Integrated Watchdog MOSFET Output
Terminal block TB2 provides a solid-state switch (rated for external alarm loads) that activates when the watchdog detects CPU lockup, communication timeouts, or critical system errors. Connect to SCADA alarm inputs, beacon lights, or PLC digital inputs for immediate fault notification.

✓ Run/Remote/Local Keyed Mode Selector
Physical three-position switch enables safe field maintenance by preventing unintended remote commands during on-site service. Run mode enables autonomous operation, Remote allows SCADA control, and Local locks out remote commands for technician safety.

✓ Eight-LED Diagnostic Array
Front-panel indicators display watchdog status, CPU idle time, power quality, module communication health, and sequencer state—enabling rapid troubleshooting without laptop connection or SCADA access. Critical for remote sites with limited connectivity.

Typical Application Scenarios

→ Remote Pipeline Monitoring Stations
In oil & gas midstream operations, the 396657-01-0 powers ControlWave Micro RTUs at unmanned compressor stations and pump sites where solar panels and battery banks create fluctuating DC voltages. The wide 10.7-30 Vdc input range maintains stable operation despite daily charge/discharge cycles, while the watchdog output triggers satellite communication alerts when RTU health degrades.

→ Municipal Water/Wastewater SCADA Networks
Lift stations and treatment plants benefit from the Run/Remote/Local switch, which allows maintenance crews to perform on-site diagnostics and calibration without disabling remote monitoring. The Class I Division 2 rating permits installation in methane-prone wet wells and digester buildings where explosive atmospheres may occur.

→ Utility Substation Automation
Electric utility substations deploying IEC 61850-compliant RTUs leverage the 1200ms power detection to ride through momentary voltage sags caused by capacitor bank switching or fault clearing events. The triple-level voltage monitoring (JP2/JP4/JP5) protects against sustained DC bus overvoltage from ground faults or charger malfunctions.

→ Chemical Process Control & Refineries
Hazardous location certification (Class I Div 2, Groups A-D) and robust EMI immunity make this module suitable for installation near VFDs, high-power motor starters, and RF transmitters. The 3A slow-blow fuse provides overcurrent protection without nuisance tripping during inrush current events at system startup.

Technical Parameters & Selection Guide

Selection Criteria: Choose the 396657-01-0 when your ControlWave Micro RTU requires UL-listed hazardous location certification, operates in extreme temperature environments, or must accommodate variable DC input voltages from renewable energy sources. For non-hazardous indoor applications with stable 24V DC power, consider standard PSSM variants (consult Emerson product selector).

Extended Functions & System Integration

I/O Expansion Compatibility: When paired with the 396356-01-0P I/O expansion rack, systems can scale to 24+ I/O points while maintaining centralized power distribution. The PSSM's +3.3 Vdc rail extends across the expansion backplane, eliminating the need for additional power supplies.

Modbus RTU/TCP Integration: The watchdog MOSFET output (TB2) can drive Modbus-compatible digital input modules, enabling SCADA systems to monitor RTU health via standard Modbus registers. Configure as a discrete input alarm point for integration with Wonderware, Ignition, or other HMI/SCADA platforms.

Redundant Power Configurations: For mission-critical applications, deploy dual DC power sources (primary + backup battery bank) with diode-OR wiring to TB1. The module's wide input range and power quality monitoring ensure seamless transition during primary source failures.

Delivery Timeline & Service Guarantee

Standard Lead Time: 3-5 business days for in-stock units (US/Canada), 7-10 business days for international shipments. Expedited shipping available upon request.

Warranty Coverage: 12-month manufacturer's warranty covering defects in materials and workmanship. Extended warranty options available for critical infrastructure deployments.

Technical Support: Access to Emerson-certified application engineers for pre-sales consultation, installation guidance, and troubleshooting assistance. Email and phone support available during business hours (UTC+8).

Documentation Package: Each module ships with installation quick-start guide, jumper configuration reference card, and digital access to full technical manual (PDF) including wiring diagrams, LED status code tables, and hazardous location installation requirements.

Frequently Asked Questions

Q: Can the 396657-01-0 power supply module operate with solar panel input voltages?
A: Yes, the wide 10.7-30 Vdc input range accommodates typical solar charge controller outputs. Configure jumpers JP2/JP4/JP5 for 12V nominal operation when using 12V battery banks, or 24V nominal for 24V systems. Ensure your solar array and charge controller can maintain at least 10.7 Vdc under worst-case load conditions.

Q: What is the maximum current capacity for the watchdog MOSFET output on terminal TB2?
A: Consult the official Emerson datasheet for exact current ratings (typically 500mA range). The MOSFET switch is designed to drive alarm panel inputs, beacon lights, or PLC digital inputs. For higher-current loads (e.g., horns, strobes), use an external relay with the MOSFET driving the relay coil.

Q: How do I configure the power fail trip points for my 24V DC bus system?
A: The factory default configuration (jumpers JP2, JP4, JP5 in positions 2-3) is optimized for 24V nominal systems. For 12V systems, move all three jumpers to positions 1-2. Refer to the jumper configuration guide included with the module for detailed pin-out diagrams and voltage threshold tables.

Q: Is the 396657-01-0 compatible with ControlWave Express or only ControlWave Micro?
A: This PSSM is designed specifically for ControlWave Micro base housings (3-, 4-, or 8-slot). For ControlWave Express systems, verify compatibility with Emerson technical support or consult the ControlWave Express hardware manual for approved power supply modules.

Q: Can I hot-swap the 396657-01-0 module during system operation?
A: No, the PSSM is not hot-swappable. Always power down the ControlWave Micro system, disconnect external DC power at TB1, and wait 30 seconds for capacitor discharge before removing or installing the module. Hot-swapping may damage the module or connected I/O cards.

Q: What fuse type should I use for field replacement of the F1 overcurrent protection?
A: Use only 3A slow-blow (time-delay) fuses in 5×20mm glass cartridge format. Fast-blow fuses may cause nuisance trips during system startup inrush current. Recommended part numbers: Littelfuse 218003 or Bussmann GDC-3A. Keep spare fuses on-site for rapid field replacement.

Order Your Emerson 396657-01-0 PSSM Today

Ensure uninterrupted operation of your ControlWave Micro RTU with genuine Emerson power supply modules. Our technical team is ready to assist with system design, jumper configuration guidance, and integration support for your SCADA deployment.

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