Description
General Information
| Item | Specification |
|---|---|
| Part Number | CMA121, 3DDE300401 |
| Manufacturer | ABB |
| Product Family | Synpol‑D Generator Control System |
| Product Type | Rack‑mount DC Power Supply Module |
| Installation | Eurocard plug‑in module, inserted into Synpol‑D system rack |
| Power Supply | AC input: 85‑264 VAC, 47‑63 Hz |
| Lifecycle Status | Obsolete / End‑of‑Life. OEM manufacturing discontinued. Only new‑old‑stock, refurbished and field‑pulled used maintenance spare parts available; no brand‑new factory‑built units can be ordered. |
| ESD Handling Requirement | Switch‑mode power electronic board; anti‑static wrist‑strap and anti‑static workstation required for installation and replacement operations. |
Electrical & Interface Specifications
- Backplane Interface: Gold‑plated eurocard edge connector, delivers multiple regulated DC rails to Synpol‑D rack backplane for CPU, measurement, display and I/O cards.
- Input Terminals: Screw terminals for AC mains input.
- Output Rails: Provides stabilized +5 VDC, ±15 VDC, +24 VDC for all Synpol‑D rack internal modules.
- Max Output Power: 120 W total power capacity for the system rack.
- Built‑in Protection: Over‑voltage, over‑current, short‑circuit, over‑temperature shutdown protection.
- Status Indicator: Power OK LED indicator on module front edge.
- On‑Board Circuitry: Switch‑mode conversion circuit, filter circuit, fault latch protection circuit.
- Power Consumption: Typical 130 W (max input).
- Operation Limitation: Cannot operate standalone. Must be installed inside Synpol‑D rack to supply power for CMA122 CPU, CMA123 display, CMA124 measuring and other daughter boards.
- Compatibility Matrix
‑ Compatible System: ABB Synpol‑D generator / marine power‑plant control rack
‑ Mounting: Standard eurocard slot in Synpol‑D rack
‑ Hot‑swap: Not supported; rack power must be switched off before module replacement.
Environmental Specifications
| Item | Value |
|---|---|
| Operating Temperature | ‑20 °C ~ +60 °C inside control cabinet |
| Storage / Transport Temperature | ‑40 °C ~ +85 °C for long‑term spare‑part preservation |
| Relative Humidity | 5 %‑95 % RH, non‑condensing; avoid condensation to prevent circuit corrosion. |
| Compliance Standard | CE certification for marine & industrial automation environment, complies with IEC marine environmental criteria. |
| Protection Class | IP00 internal circuit; module inside cabinet environment only. |
| Dimension | Standard eurocard plug‑in form‑factor |
| Net Weight | Approx. 0.85 kg |
| Conformal Coating | Conformal‑coated variant available for offshore and marine high‑humidity environments. |
| Vibration Resistance | Complies with IEC 60068‑2‑6 marine‑grade vibration standard. |
Main Functions
- CMA121 (3DDE300401) is the rack‑mount switch‑mode DC power supply module for ABB Synpol‑D generator control system. It converts universal AC mains input into multiple stable DC power rails for all internal plug‑in cards in the Synpol‑D rack, including CPU, measurement, generator interface and display boards.
- Multi‑output regulated power supplies: +5 V, ±15 V, +24 V, supplies power for logic circuit, analog measurement circuit, relay drive and peripheral interface circuits.
- Integrated comprehensive hardware protection: over‑voltage, over‑current, short‑circuit and over‑temperature protection. When fault occurs, the module will shut down output to avoid damage to other rack‑mounted modules.
- Power‑OK LED provides visual status indication for on‑site maintenance personnel.
- Typical field failure symptoms
‑ No power‑up for whole Synpol‑D rack, all modules without indicator light
‑ Intermittent system reset, unstable rack power rails
‑ Power‑OK LED off, no DC output while AC input is normal
‑ Over‑temperature shutdown under cabinet high‑temperature condition
Common root causes: AC input abnormal, internal capacitor ageing, power component damage, cabinet ventilation poor, marine‑environment dust and moisture erosion.
- Pure maintenance‑oriented spare‑part component, only for repair and replacement of existing legacy Synpol‑D genset / marine power‑plant installations; not suitable for new‑project engineering deployment.
Typical Applications
- Spare‑part replacement for CMA121 power‑supply module inside ABB Synpol‑D generator control rack.
- Troubleshooting scenarios: whole system power‑loss, random controller reset, power‑supply protection shutdown.
- Preventive‑maintenance spare‑part inventory for marine vessel power station and industrial emergency generator‑set control system.
- Hardware refurbishment for decommissioned Synpol‑D genset control assemblies.
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