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)

Parameter	Specification
Input Channels	4 (supports active and passive probes)
Isolation	±1000 VDC (for passive probes)
Input Type	– Magnetic pickup: 0.5Vpk – 42Vpk – Active pickup: OFF < 1VDC; ON > 3.5VDC (TTL) – OFF < 6V; ON > 10V @ 24V
Frequency Range	– Magnetic pickup: 150 Hz – 25 kHz – Active pickup: 1 Hz – 10 kHz
Excitation Voltage	5V or 24V DC
Resolution	0.015% of upscale
Accuracy	0.05% of reading
Input Impedance	– Passive: 2kΩ @ 1kHz – Active: >1.5kΩ
Input Scan Rate	2.5ms

Digital Outputs

Parameter	Specification
Output Channels	4 isolated outputs (Form A SPST/NO or Form B SPST/NC)
Contact Type	Gold-clad silver nickel
Maximum Load Voltage	230V AC (RMS) / 24V DC
Maximum Load Current	– 0.5A @ 230V AC (resistive load) – 2A @ 24V DC (resistive load)
Minimum Load Voltage	5V DC
Minimum Load Current	10mA
Channel-to-Channel Isolation	1500V AC RMS / ±1500V DC
Turn On/Off Time	≤ 20ms
Contact Life	– 10,000,000 operations (mechanical life) – 200,000 operations @ 3A load

Analog Inputs

Parameter	Specification
Input Type	Voltage or current (2-wire/self-powered transmitters)
Input Channels	8
Common Mode Voltage	-6V to +5V peak (DC to 60Hz)
A/D Converter Resolution	16-bit
Input Range	0-5V, 1-5V, 0.4-2V, 4-20mA (via 250Ω)
Maximum Input Voltage	±30V
Input Impedance	>10MΩ (powered voltage inputs)
Input Scan Rate	10ms
Accuracy	±0.075% FS (23.5°C ±2°C) ±0.15% FS (0-60°C)

Analog Output

Parameter	Specification
Output Type	4-20mA
Output Channels	1
Resolution	±0.05% of full scale
Accuracy	±0.35% FS (including linearity @ 25°C)
Response Time	1ms
Max Resistive Load	760Ω (24V supply @ 22-28V DC)
Max Output Compliance Voltage	16V
Max Open Circuit Voltage	18V

Digital Inputs

Parameter	Specification
Input Channels	8
Power Voltage Range	22-28V DC
ON Sense Voltage	≥ 13V DC / 6.12mA min.
OFF Sense Voltage	≤ 5V DC / 2.1mA max.
Input Impedance	4.6kΩ
Absolute Delay	1.78ms
Guaranteed ON Resistance	≤ 300Ω @ 15V DC
Guaranteed OFF Resistance	≥ 30kΩ @ 30V DC