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Description
The Honeywell 900PSM-0101 is a Redundant Power Status Module purpose-built for the ControlEdge HC900 and Experion PKS process automation platforms . Unlike a conventional power supply, this module serves as the intelligent supervisor for dual-redundant power architectures—continuously monitoring the health of two independent input sources and orchestrating automatic, bumpless load transfer to ensure uninterrupted system operation . The 900PSM-0101 is a cornerstone component for achieving high system availability in mission-critical industrial control applications.
Application Scenarios
In a 24/7 chemical processing plant, a sudden failure of the primary 24V DC power feed could cripple the control system, triggering a costly and potentially dangerous emergency shutdown. The Honeywell 900PSM-0101 is deployed within the HC900 controller rack to monitor two independent power feeds—typically from separate UPS circuits . When the primary supply voltage drops below the acceptable threshold (e.g., <21V DC), the 900PSM-0101 executes a seamless, millisecond-level switchover to the secondary source, ensuring that the controller, I/O modules, and field instrumentation never lose power . Simultaneously, its alarm relays provide remote notification to the DCS or SCADA system, alerting operators to the fault so they can initiate corrective maintenance while the system continues to run under redundancy . This “active management” of power redundancy transforms a passive backup scheme into a truly resilient and maintainable architecture.
In an offshore oil and gas platform, the Honeywell 900PSM-0101 operates within a demanding environment with extreme temperature fluctuations. Its industrial-grade construction supports an operating range of -40°C to +70°C , ensuring reliable monitoring in unheated control cabinets or outdoor enclosures. The module’s front-panel LED indicators provide immediate visual confirmation of which power source is active and whether any faults exist, enabling rapid on-site diagnosis without requiring specialized software .
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 900PSM-0101 |
| Manufacturer | Honeywell International Inc. |
| Product Category | Redundant Power Status Module / Power Supply Supervisor |
| Primary Function | Dual power input monitoring, automatic failover switching, and status reporting |
| Input Channels | 2 independent 24 VDC power inputs (typical range: 18–32 VDC) |
| Redundancy Mode | 1:1 hot-redundancy with automatic, bumpless failover (switchover time: milliseconds) |
| Output Power | Provides regulated 5V DC and 3.3V DC logic power to the HC900 controller backplane |
| Power Consumption | ≤ 5W typical; 22 mA max at 5V DC |
| Alarm Outputs | Relay dry contacts for remote fault notification (e.g., Power A Fault, Power B Fault, General Fault) |
| Status Indication | Front-panel LEDs: Power A OK, Power B OK, Active Source A/B, System Fault |
| Operating Temperature | -40°C to +70°C (industrial-grade) |
| Storage Temperature | -40°C to +85°C |
| Mounting Type | Plug-in module for HC900/Experion PKS controller rack |
| Hot-Swap Support | Yes – supports module insertion and removal under power |
| Protection Class | IP20 (indoor cabinet installation) |
| Certifications | CE, UL, CSA compliant |
