HONEYWELL TK-PRS021

Description

Product Description

HONEYWELL TK-PRS021 is a Power Regulator and Supervisory Module for a Honeywell control system, most likely for a Fire Alarm Control Panel (FACP) or a critical Building Management System (BMS) node. This module is a specialized power management and system monitoring component. Its primary function is to regulate and distribute primary and backup power within the control panel while providing comprehensive system supervision. The HONEYWELL TK-PRS021 ensures that all other modules (CPU, network cards, I/O) receive clean, stable DC power, manages battery charging and switching during AC failure, and monitors system health parameters such as ground faults, battery condition, and power quality. The reliability of this module is paramount, as it is the foundational power and health monitoring hub for the entire panel.

Product Parameters / Technical Specifications

• Manufacturer: Honeywell (Building Technologies / Fire & Security Division)
• System: Honeywell Fire Alarm (e.g., Notifier) or BMS Control Panel
• Functional Designation: Power Regulator & Supervisory Module
• Input Power: Accepts primary AC Mains (120VAC/240VAC) and connections for Secondary Backup Batteries (typically 12VDC or 24VDC sealed lead-acid).
• Output Power: Provides multiple regulated DC voltage outputs (e.g., +24VDC, +5VDC, ±12VDC) for the system’s logic boards, detectors, and auxiliary equipment.
• Battery Management: Includes a battery charger with float/trickle charge modes, end-of-charge voltage regulation, and low-battery disconnect to prevent deep discharge.
• Supervision & Monitoring:
  • AC Power Failure Detection
  • Battery Health Monitoring (voltage, charge current)
  • Earth/Ground Fault Detection on field wiring circuits
  • Output Power Supervision (over-current, short-circuit)
• Communication: Reports all supervisory conditions (AC Fail, Battery Low, Ground Fault) to the main system CPU via the panel’s backplane or a dedicated data link.
• Mounting: A slide-in or fixed module designed for a specific panel chassis.
• Certifications: Carries critical safety certifications such as UL 864 (for fire alarm control units) and UL 508 (for industrial control equipment).

Advantages and Key Features

• Integrated Power Management: The HONEYWELL TK-PRS021 consolidates AC/DC conversion, battery charging, power distribution, and system supervision into a single, reliable unit, reducing complexity and points of failure.
• Comprehensive System Supervision: Its ability to detect and report AC failure, low battery, and ground faults is a core safety feature, providing early warnings for maintenance and ensuring system integrity. This is a defining advantage of the TK-PRS021.
• Robust Battery Management: Intelligent charging prolongs backup battery life and ensures they are ready to support the system during a power outage, which is critical for life-safety applications.
• Fail-Safe Design: Engineered to maintain critical outputs and supervisory functions even during brownouts or switching events, supporting the high availability required of fire and security systems.
• Plug-and-Play for OEM Panels: Designed as a direct replacement for specific Honeywell panels, ensuring perfect electrical and mechanical compatibility, correct current ratings, and maintained system certification.

Application Cases in Industry

• Fire Alarm Control Panel (FACP) Power Core: Serves as the main power and supervisory module in a fire alarm panel, powering the CPU, detector loops, and notification appliance circuits (NACs) while monitoring for faults that could impair system operation.
• Critical Building Controller Power: Used in high-availability BMS controllers (e.g., for data centers, hospitals) to provide supervised, battery-backed power, ensuring the building automation system remains online during power events.
• Security System Power Hub: Provides managed power to security panels, access control systems, and surveillance equipment where continuous operation is mandatory.
• Industrial Panel Power Supervision: Can be used in custom industrial control panels where reliable, supervised power with battery backup is required for process monitoring or safety interlocks.

Comparison with Competing Products

Selection Suggestions and Precautions

1. Verify Exact Panel Model Compatibility: The HONEYWELL TK-PRS021 is not universal. It must be specified for your exact fire alarm or BMS panel model (e.g., Notifier NFS2-640). Using an incompatible module can damage the panel and void its listing.
2. Battery Specification is Critical: Use only the battery type, voltage, and amp-hour (Ah) rating specified by Honeywell for use with this module. Incorrect batteries can cause charging faults, inadequate backup time, or damage.
3. Understand Supervisory Circuits: Be familiar with how the module’s ground fault detection works. It typically requires a specific wiring scheme (isolated/common ground) for the field circuits it monitors. Incorrect field wiring can cause nuisance ground fault alarms.
4. Safe Handling of Live Circuits: Replacement involves working with hazardous live AC mains and battery terminals. Always disconnect AC power and battery leads, following proper Lockout/Tagout (LOTO) procedures, before installation.
5. Post-Installation Testing: After installing a new TK-PRS021, you must perform full system tests: verify all output voltages, simulate an AC failure to confirm battery switchover and low-battery alarm, and test the ground fault detection if applicable.
6. Sourcing from Authorized Life-Safety Distributors: This is a life-safety critical component. Purchase the TK-PRS021 only from authorized Honeywell Fire & Security or Building Solutions distributors. This ensures you receive a genuine, certified part with the correct firmware and full technical support necessary for compliant system maintenance.

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