Honeywell CC-PSP401 51454122-175 Speed Protection Module

Functionality

The Honeywell CC-PSP401 Speed Protection Module (SPM) is a Series C I/O module designed to handle up to four speed probe signals in the form of electrical pulses. It provides onboard signal conditioning and a two-out-of-three voting system to ensure accurate speed detection and regulation. The module is used for over-speed protection in turbomachinery applications and is integrated into Honeywell’s C300 controller for speed regulation.

Key Features

• Accepts up to four pulse input signals for speed and acceleration computation
• Two-out-of-three voting mechanism for speed signal validation
• Eight digital input channels (configurable for trip input in protection logic)
• Four digital output signals to trigger protection actions
• Configurable trip limits for speed and acceleration
• Low-latency loop response (≤40ms) from input detection to trip activation
• Analog I/O support:
  • 8 analog input channels
  • 1 analog output channel (4-20mA)
• Point processing:
  • 2.5ms for pulse inputs
  • 10ms for analog inputs
• Redundant system support for improved reliability
• Field diagnostics for issues such as:
  • Zero speed
  • Reverse rotation
  • Missing/deformed tooth detection
  • Open wire detection for AI/DI
  • Current readback for AO
• Supports non-incendive field power
• Built-in hardware/software diagnostics

Technical Specifications

Speed Inputs (Active/Passive Probes)

Digital Outputs

Analog Inputs

Analog Output

Digital Inputs