Honeywell CC-PSP401 Speed Protection Module for Turbomachinery Overspeed Protection

Speed Protection Module Overview

The Honeywell CC-PSP401 is a Series C I/O module engineered for over-speed protection of turbomachinery. It accepts up to four speed probe signals in the form of electrical pulses and provides onboard signal conditioning with two-out-of-three voting. The voted speed signal participates in speed regulation through a control loop built into the C300 controller. This module also provides onboard limit value monitoring to trigger the over-speed trip protection relay on the same module IOTA. General purpose I/Os on this module can also serve fast applications such as centrifugal compressor anti-surge control.

Technical Specifications Breakdown

Key parameters for the CC-PSP401 are listed below for quick reference:

Industry Applications

Turbomachinery Overspeed Protection

The CC-PSP401 is designed for over-speed protection of turbomachinery. With two-out-of-three voting on speed inputs, it ensures reliable detection of overspeed conditions. The configurable trip limits for speed and acceleration allow precise protection settings. The 40 mS overall loop latency from input change to triggering the protection device meets demanding safety response requirements.

Centrifugal Compressor Anti-Surge Control

Beyond overspeed protection, the general-purpose I/Os on this module support fast applications like centrifugal compressor anti-surge control. The analog inputs accept 4-20 mA signals from transmitters, and the analog output provides a 4-20 mA control signal. The fast 10 ms scan rate for analog inputs enables responsive control.

Redundant Safety Solutions

The module supports redundant solutions, enhancing system availability. The field diagnostics include zero speed, reverse rotation, missing/deformed tooth, open wire detection for AI and DI, and current read back for AO. These diagnostics help identify sensor or wiring faults before they compromise safety.

Installation & Setup Guidance

When installing the CC-PSP401, ensure the IOTA provides galvanic isolation of ±1000 VDC for passive probe interfaces. Use isolation transformers on the IOTA as specified. For speed inputs, select either active or passive probes per channel. Configure trip limits for speed and acceleration according to your machinery's requirements. For digital outputs, choose Form A (SPST/NO) or Form B (SPST/NC) via jumpers per output. Verify that the load voltage and current do not exceed the maximum ratings: 230 VAC (RMS) or 24 VDC, with steady-state current up to 2 A for 24 VDC resistive loads.

Maintenance & Reliability

Regularly inspect the module and IOTA for signs of wear or damage. Check that all field wiring connections are secure. Periodically test the speed probes and digital inputs to ensure they are functioning correctly. Use the built-in diagnostics to detect open wires or sensor issues. Keep the module within the specified environmental conditions to maintain accuracy.

Compatibility & Integration

The CC-PSP401 integrates with the Honeywell C300 controller. It accepts up to four speed probe signals and provides two-out-of-three voting. The voted speed signal is used in the control loop. The module also provides onboard limit monitoring to trigger the over-speed trip relay. It supports redundant configurations for enhanced reliability.

Selection Guide & Purchasing Advice

When selecting a speed protection module, consider the number of speed inputs, the type of probes (active or passive), and the required loop latency. The CC-PSP401 offers 4 speed inputs, 8 analog inputs, 8 digital inputs, 4 digital outputs, and 1 analog output. Its 40 mS loop latency and two-out-of-three voting make it suitable for critical turbomachinery protection. Contact AutoDCSTech to verify current lifecycle status and availability before ordering. AutoDCSTech is an industrial automation parts supplier with a focus on quality and reliability.

Troubleshooting & Common Issues

If the module does not trigger protection as expected, check the speed probe wiring and signal levels. Ensure the input frequency is within the specified range (magnetic pickup: 150 Hz to 25 kHz; active pickup: 1 Hz to 10 kHz). Verify that the trip limits are configured correctly. If the digital outputs do not activate, check the jumper settings and load connections. Use the diagnostic features to identify open wires or sensor faults. For persistent issues, consult the Honeywell documentation or contact AutoDCSTech for support.