1. Overview
This module adopts a standard plug-in mechanical structure compatible with universal Ovation control rack backplanes. It accesses square wave, sine wave and passive contact pulse signals sent by turbine flowmeters, vortex flowmeters, turbine speed pickups and rotary encoders. After isolation conditioning and hardware high-speed counting, raw pulse signals are converted into physical quantities such as rotational speed and cumulative flow, and transmitted to the local DPU via the internal backplane bus. Every module undergoes strict factory high-frequency signal calibration and burn-in aging testing to guarantee reliable counting accuracy and anti-jitter capability.
2. Core Functional Features
2.1 Multiple Signal Types Supported
Compatible with active square wave, sine wave and passive contact pulse input; the frequency measurement range and counting time base can be configured independently per channel, matching mainstream industrial pulse output instruments and speed sensors.
2.2 Per-Channel Independent Optoelectronic Isolation
Each input channel is equipped with a dedicated optocoupler isolation circuit, completely isolating the field sensor loop and DCS internal control circuit. It suppresses ground potential difference and interference introduced by long signal cables, preventing abnormal external voltage from damaging the rack backplane and controller hardware.
2.3 Hardware High-Speed Precision Counting
Adopts onboard independent hardware counters, free from DPU scan cycle limitations, ensuring stable and accurate acquisition even for high-frequency pulse signals. It simultaneously supports instantaneous frequency calculation and pulse cumulative totalization.
2.4 Multi-Level Input Protection Design
Integrated transient surge absorption, input overvoltage limiting and reverse polarity protection components. It adapts to complex field wiring environments and effectively resists voltage spikes induced by long-distance transmission cables.
2.5 Hot-Swap Online Maintenance
Supports live hot swapping during continuous DCS operation; replacement maintenance will not affect the pulse counting data of other channels or disrupt rotating equipment monitoring and protection logic.
2.6 Full Onboard Real-Time Self-Diagnosis
Real-time detection of signal loss, frequency overload, channel open circuit and internal power supply faults. Fault codes and alarm messages are remotely uploaded to the Ovation operator workstation, while front panel LEDs provide local intuitive status prompts for fast on-site troubleshooting.
2.7 Native System Compatibility
Fully compatible with full-series Ovation DPUs and standard I/O backplanes. No additional adapter boards or cabinet reconstruction are required for installation, applicable to new project construction and spare part replacement for legacy unit renovation.
3. Key Technical Specifications
Mounting Mode: Standard Ovation rack plug-in installation
Supported Input Signals: Square wave / sine wave frequency signal, passive contact pulse, speed pickup signal
Power Supply: DC power supplied by rack backplane, no external auxiliary wiring required
Isolation Mode: Independent optoelectronic isolation for each channel
Operating Temperature: 0 ℃ ~ +60 ℃
Storage & Transportation Temperature: −40 ℃ ~ +85 ℃
Relative Humidity: ≤95% RH, non-condensing
EMC Compliance: Complies with industrial G3 anti-corrosion standard and anti-interference requirements for power plant control cabinets
4. Front Panel LED Indicator Definition
PWR (Green LED): Steady ON = module internal power supply normal; OFF = power loss or blown internal fuse
CH ACT (Green LED): Flashes synchronously with valid incoming pulse signals
COMM (Green LED): Blinking = normal data interaction with local DPU and backplane bus
FAULT (Red LED): Illuminates upon signal loss, hardware damage or communication interruption; fault status is latched for maintenance confirmation
5. Application Scope
Thermal Power Industry
Collect turbine rotational speed signals, feedwater flowmeter pulse signals, pulverizer and induced draft fan speed feedback signals, for unit speed monitoring, cumulative flow statistics and overspeed protection logic judgment.
Petrochemical Industry
Acquire pulse output signals from turbine flowmeters and vortex flowmeters on process pipelines to realize instantaneous flow monitoring and batch cumulative metering.
Metallurgy, Waste Incineration Power Plants & District Heating Stations
Complete real-time rotational speed measurement of large rotating machinery and pulse flow totalization, supporting long-cycle unattended stable operation of full production lines.
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