Emerson 396657-01-0 ControlWave Power Supply Module with Local Switch

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

The Emerson 396657-01-0 is a critical power distribution and system monitoring module designed exclusively for ControlWave Micro remote terminal units (RTUs). This intelligent power supply/sequencer module (PSSM) converts external DC bulk power into regulated +3.3 Vdc and +5 Vdc rails, distributing clean power across the entire backplane while continuously monitoring system health through integrated watchdog circuitry and multi-level status indicators.

Core Functionality & System Architecture

Installed exclusively in slot #1 of ControlWave Micro base housings (3-, 4-, or 8-slot configurations), the 396657-01-0 serves as the central power hub and system supervisor. Its DC-to-DC converter accepts wide-range input (+10.7 to +30 Vdc) and delivers stable +3.3 Vdc to all installed modules via the 44-pin backplane connector. The auxiliary +5 Vdc rail powers low-power detection circuits and sequencer timing logic, ensuring orderly startup and shutdown sequences that protect sensitive electronics.

The integrated Run/Remote/Local keyed switch provides three operational modes: Run for autonomous operation, Remote for SCADA control, and Local for on-site maintenance and diagnostics. This physical mode selector enhances safety during field service by preventing unintended remote commands.

Advanced Power Monitoring & Protection

1200 ms Good Power Detection: The module employs sophisticated power quality monitoring with a 1200-millisecond detection window, filtering transient voltage spikes while responding rapidly to sustained power anomalies.

Triple-Level Voltage Monitoring: Three independent jumper-configurable trip points (JP2, JP4, JP5) monitor power fail thresholds, power supply shutdown limits, and field voltage shutdown conditions. Each can be set for 12V or 24V nominal operation, accommodating diverse installation requirements from solar-powered remote sites to industrial 24V DC bus systems.

Watchdog MOSFET Switch: Terminal block TB2 provides a solid-state MOSFET output for driving external alarm annunciators, beacon lights, or SCADA alarm inputs. When the watchdog detects CPU lockup, communication failure, or critical system errors, it activates this output to alert operators immediately.

Application Scenarios

Oil & Gas Pipeline Monitoring: Deploy in remote pump stations and compressor sites where the 396657-01-0's wide input voltage range (10.7-30 Vdc) accommodates fluctuating solar panel output and battery bank voltages. The watchdog output triggers satellite communication alerts when RTU health degrades.

Water/Wastewater SCADA Networks: Install in lift stations and treatment plants where the Run/Remote/Local switch enables safe maintenance without disabling remote monitoring. The Class I Division 2 rating permits installation in methane-prone environments near digesters and wet wells.

Utility Substation Automation: Integrate into IEC 61850-compliant substations where the module's 1200 ms power detection prevents nuisance trips during momentary voltage sags, while the out-of-spec detection circuit protects against sustained overvoltage from DC bus faults.

Industrial Process Control: Support ControlWave Micro RTUs in chemical plants and refineries where hazardous location certification (Class I Div 2, Groups A-D) and robust EMI immunity ensure reliable operation in electrically noisy environments with VFDs and high-power switchgear.

Technical Specifications

LED Status Indicators & Diagnostics

The front panel features eight LEDs providing real-time system diagnostics:

• WD (Watchdog): Illuminates when watchdog circuit detects system anomalies
• IDLE: Indicates CPU free time—higher duty cycle suggests healthy processing margin
• Six Status LEDs: Display system status codes for power quality, module communication, and sequencer state

This visual feedback enables rapid troubleshooting without requiring laptop connection or SCADA access, critical for remote sites with limited connectivity.

Installation & Configuration Best Practices

Pre-Installation Jumper Configuration: Before inserting the module, configure JP2, JP4, and JP5 based on your DC power source. For 12V battery systems, move all jumpers to positions 1-2; for 24V industrial DC bus, use positions 2-3 (factory default).

Grounding Requirements: Connect TB1-3 to earth ground using #14 AWG wire minimum. In hazardous locations, follow NEC Article 501-4(b) (US) or CEC Section 18-152 (Canada) for proper bonding and grounding to prevent ignition sources.

Watchdog Output Wiring: TB2 MOSFET switch can sink up to 500 mA (consult datasheet for exact rating). Connect to PLC digital inputs, alarm panels, or beacon lights with appropriate current-limiting resistors. Use shielded cable in high-EMI environments.

Fuse Replacement: Use only 3A slow-blow 5×20 mm fuses (F1). Fast-blow fuses may nuisance-trip during inrush current at startup. Keep spares on-site for rapid field replacement.

System Compatibility & Expansion

The 396657-01-0 supports all ControlWave Micro I/O modules including analog input/output, digital I/O, serial communication, and specialty modules. When paired with the 396356-01-0P I/O expansion rack, systems can scale to 24+ I/O points while maintaining centralized power distribution and watchdog monitoring.

What's Included

• 1× Emerson 396657-01-0 PSSM Module (Revision A or later)
• 1× 3A Slow-Blow Fuse (5×20 mm, pre-installed)
• Installation Documentation & Jumper Configuration Guide

Why Choose the 396657-01-0?

Unlike generic industrial power supplies, the 396657-01-0 integrates power conversion, system sequencing, watchdog monitoring, and operational mode control in a single compact module. Its UL-listed hazardous location certification, wide temperature range (-40 to +70°C), and proven reliability in thousands of remote installations worldwide make it the preferred choice for mission-critical SCADA and RTU deployments.

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