GE MMII-PD-1-2-120

GE MMII-PD-1-2-120是GE涡轮系统双通道脉冲调理模块，120V供电版本，专门配套MPU磁电测速探头使用。模块将磁探头输出的微弱正弦感应信号放大滤波，经过阈值整形后输出规整方波脉冲，送入主控板完成转速计算。

GE MMII-PD-1-2-120 is GE dual-channel pulse detector for turbine controls with 120V supply. It amplifies weak sine signals from magnetic pickups, filters interference and converts them into clean square pulses for speed measurement by the main controller.

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两路通道相互独立，支持冗余转速采集，阈值可微调，抗干扰能力适配电厂强电磁环境。该板常用于Mark VI等老款涡轮控制柜，实现超速保护、零速闭锁、盘车监测，属于机组转速保护链路上的关键前端备件。

Two isolated independent channels support redundant speed input with adjustable trigger threshold for heavy EMI plant environments. It is commonly installed in Mark VI racks for overspeed protection, zero-speed interlock and barring monitoring, a critical front-end spare in turbine speed protection chain.

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Main Specifications 技术参数

1. Product Series / 产品系列：GE Turbine Speed Monitoring & Protection System
2. Part Numbers / 型号编码：MMII-PD-1-2-120 (Dual Channel Pulse Detector)
3. Function Type / 类型：MPU Pulse Signal Conditioning Board 磁电探头脉冲信号调理板
4. Key Features / 特性：Dual isolated channels,120V rated,adjustable threshold,EMI filter,square wave pulse output
5. Mounting / 安装：控制柜底板或DIN导轨安装

Core Functions 核心功能

1. 采集磁电式MPU探头微弱感应信号，放大整形输出标准方波脉冲。
Receive weak MPU signals and convert into standardized square wave pulses.
2. 双通道独立信号回路，搭建冗余转速采集，提升保护回路可靠性。
Dual independent channels for redundant speed acquisition to improve protection reliability.
3. 可调触发电平，适配不同安装间隙下磁探头输出幅值差异。
Adjustable trigger level to adapt MPU signal amplitude variation from different gap distances.
4. 硬件滤波抑制线缆耦合干扰，减少误脉冲引发转速跳变、误报警。
Hardware filtering suppresses EMI and avoids false pulse alarms and speed flicker.
5. 为超速保护、零速闭锁、转速闭环调节提供可靠脉冲输入源。
Provide valid pulse source for overspeed protection, zero-speed interlock and speed regulation.

Application Scenarios 应用场景

1. GE Mark VI燃机、汽机控制柜转速监测回路备件更换维保。
Spare replacement for speed monitoring loops on GE Mark VI gas and steam turbine cabinets.
2. 机组超速保护系统，双路转速冗余采集，规避飞车风险。
Turbine overspeed protection system with dual redundant speed input to prevent overspeed hazard.
3. 盘车状态、零速检测，用于机组启停阶段联锁控制逻辑。
Barring and zero-speed detection for interlock logic during unit start and shutdown.
4. 存量GE涡轮控制系统改造，老旧脉冲检测板卡替换升级。
Retrofit of legacy GE turbine control systems and replacement of aging pulse boards.
5. 海外电站项目成套备件，配套MPU磁电探头、Mark VI板卡打包交付。
Complete spare set for overseas power projects matched with MPU sensors and Mark VI boards.