ABB CMA136 3DDE300416
ABB CMA136 3DDE300416 - Image 2

ABB CMA136 3DDE300416

Product Brief Introduction

CMA136 is a relay output terminal board under ABB Advant power generation DCS system, matching CMA126 main control module to realize switching value control signal distribution and relay isolation output of generator protection system, part code 3DDE300416 is standard mass production version, specially used for driving generator protection contactors, solenoid valves and alarm indicator lights.

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Category: SKU: ABB CMA136 3DDE300416

Description

ABB CMA136 3DDE300416

 

Technical Specifications & Performance Parameters

  1. Channel Configuration: 4 groups of independent relay output channels
  2. Relay Contact Load Parameters:
    • AC load: 5A @ 250VAC resistive load
    • DC load: 10A @ 24VDC DC load
  3. Working Power Supply: 24VDC control power supply for internal drive circuit
  4. Insulation Performance: Insulation resistance ≥100MΩ between circuit board and shell; channel-to-channel isolation voltage 1000VAC
  5. Operating Temperature Range: -25°C ~ +70°C; storage temperature -40°C ~ +85°C
  6. Mechanical Life of Relay: 10 million times switching under rated load
  7. Protection Grade: IP20 for cabinet internal installation
  8. Backplane Matching: Direct plug-in with Advant DCS system standard rack backplane

 

Function Characteristics

  1. Four groups of independent relay output channels, each channel with independent isolation circuit, no mutual interference between control loads
  2. Receive switching control instructions from CMA126 main control module through DCS backplane bus, drive relay contact pull-in and disconnection
  3. Built-in surge absorption circuit for each relay channel, absorb reverse electromotive force generated by inductive loads (contactors, solenoid valves)
  4. Channel status LED indicator on front panel, real-time display relay pull-in/disconnection state for on-site quick inspection
  5. Overload protection for each output channel, automatically cut off output when load current exceeds rated value to avoid relay burnout
  6. Compatible with generator unit all protection interlock load equipment, realize fault trip, alarm light, auxiliary valve switch control
  7. Support hot-swap in DCS rack, replace terminal board without stopping generator unit DCS system

 

Material Composition

  1. Circuit board: High-temperature FR4 flame-retardant PCB, tin-lead-free anti-corrosion coating
  2. Relay components: Silver alloy contact industrial electromagnetic relays with long service life
  3. Surge absorption components: TVS transient voltage suppression diode for each channel
  4. Wiring terminals: Copper alloy nickel-plated screw terminals, anti-loose spring gasket
  5. Outer shell: Black flame-retardant ABS plastic cabinet plug-in shell

 

Structural Features

  1. Standard DCS single-width rack plug-in module, slide rail buckle fixed installation
  2. Front panel 4 groups of independent LED status indicators corresponding to each relay channel
  3. Rear panel partition layout: backplane bus contact area and field load wiring terminal area separated to avoid signal interference
  4. Internal independent heat dissipation channel for each relay to prevent heat accumulation of multi-channel simultaneous action
  5. Anti-vibration buffer pad between relay and circuit board, adapt to generator room long-term vibration environment

 

Working Principle

  1. CMA126 main control module sends switching control instructions to CMA136 through DCS rack backplane bus
  2. Internal drive chip receives instructions and outputs drive current to corresponding channel relay coil, pull relay contact closed
  3. Relay contact connects external 24VDC/220VAC load circuit to control generator protection equipment action
  4. Surge absorption circuit absorbs reverse electromotive force when relay coil is disconnected, protect internal drive chip
  5. LED indicator synchronously lights up when relay pulls in, visually feedback channel output state

 

Installation Requirements

  1. Installed in ABB Advant DCS dedicated control cabinet rack, slide rail lock fixed
  2. Field load wiring must be separated from DCS internal control signal wiring, separate wiring slots
  3. Inductive loads (contactors, solenoid valves) must not cancel built-in surge absorption circuit
  4. Reserve 10mm heat dissipation gap between adjacent terminal boards to avoid relay heat accumulation
  5. Cabinet protection ground wire connected to module shell grounding terminal

 

Application Scenarios

  • Generator overvoltage, overcurrent protection trip contactor drive
  • Power plant boiler emergency stop valve solenoid switch control
  • Unit fault alarm light, sound alarm horn switch output
  • Hydraulic turbine auxiliary oil pump, cooling fan interlock control
  • Substation DC system fault signal remote output

 

Usage Precautions

  1. Strictly prohibit exceeding rated contact load current, long-term overload will lead to relay contact ablation
  2. Do not plug and unplug the module when DCS system is running to avoid generator protection misoperation
  3. Regularly check relay contact surface oxidation, replace the module if contact ablation occurs
  4. Load wiring terminal screws need to be tightened every 6 months to prevent loose contact heating
  5. Avoid installing near high-temperature power modules to prevent relay coil over-temperature aging

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