ALSTOM MAE99-04

Technical Specifications

1. Channel Quantity: 8 fully independent bidirectional serial isolation channels
2. Supported Serial Protocols: RS-232, RS-422, RS-485 software configurable per channel
3. Maximum Communication Baud Rate: 115.2 kbps full-duplex bidirectional data transmission
4. Isolation Voltage Strength: 2500 VAC RMS channel-to-system reinforced galvanic isolation
5. Power Supply Input: 18VDC ~ 30VDC nominal 24VDC redundant dual power input
6. Operating Temperature Band: -25°C ~ +70°C; storage temperature -40°C ~ +85°C
7. Humidity Rating: 5%–95% relative humidity non-condensing
8. Protection Class: Module front panel IP20
9. Form Factor: Standard 3U DIN rail rack plug-in card
10. Channel Status Indicator: Independent red/green LED for power, transmit and receive signal per channel

Function Features

1. Bidirectional signal isolation supports uplink central controller and downlink field serial equipment simultaneous data transmission
2. Software-selectable serial bus protocol per single channel without hardware jumper modification
3. Dual redundant 24VDC power input circuit; automatic power switching when single power supply fails
4. Composite optoelectronic + magnetic double isolation technology to suppress common-mode high-voltage surge interference
5. Built-in ±15kV ESD electrostatic protection circuit on each serial communication terminal
6. Hot-swappable plug-in design; module replacement does not interrupt other channel communication links

Performance Parameters

• Isolation insulation resistance: ≥1000MΩ under 1000VDC megohmmeter testing
• Data transmission delay: ≤10μs per channel without serial communication signal distortion
• Long-term isolation aging stability: No insulation attenuation after 10 years continuous industrial operation
• EMC Compliance: IEC 61000-6-2 power industry heavy electromagnetic interference standard

Material Composition

1. Circuit Substrate: Thick copper FR-4 flame retardant PCB with full conformal moisture-proof coating
2. Isolation Components: Reinforced insulation high-speed optocoupler + magnetic isolation transformer per channel
3. Outer Housing: Green PA66 glass fiber reinforced plastic industrial DIN rail card shell
4. Terminal Block: Screw-type gold-plated copper multi-channel wiring terminal block
5. Heat Dissipation Hardware: Aluminum alloy heat sink for power isolation circuit components

Structural Features

1. Standard 3U height DIN rail mounting structure compatible with global industrial standard control cabinets
2. Front panel split dual terminal areas: Controller side serial terminals and field equipment side serial terminals completely separated by isolation barrier
3. Independent LED indicator group arranged above each channel terminal for real-time communication status observation
4. Built-in back metal shielding plate to block external electromagnetic wave interference
5. Spring locking DIN rail buckle for quick disassembly and fixed installation without additional fasteners

Working Principle

1. Uplink data path: Serial signal from central controller enters internal isolation circuit; optoelectronic isolation separates control side low-voltage circuit and field side high-voltage interference circuit
2. Downlink data path: Field serial equipment signal passes ESD protection circuit, magnetic isolation and optocoupler secondary isolation before transmitting to central control bus
3. Dual power supply management circuit monitors two 24VDC input sources; seamless automatic switchover upon one power loss
4. Channel signal detection circuit drives LED indicators to light up during data transmit/receive for communication fault visual diagnosis

Advantage Highlights

1. 8-channel high-density integrated design reduces cabinet DIN rail space occupation compared to single-channel isolation modules
2. 2500VAC reinforced isolation meets power grid substation high-voltage safety isolation standard requirements
3. Multi-protocol per-channel flexible configuration adapts to mixed RTU, relay and instrument serial bus system architecture
4. Dual redundant power supply eliminates single power point failure risk for critical power control communication links
5. Composite double isolation technology effectively suppresses ground loop surge in high-voltage power plant switchyard environments

Applicable Industries

Installation Requirements

1. Mount on standard 35mm DIN rail inside industrial control cabinet; reserve ≥15mm horizontal clearance between adjacent modules
2. Separate controller-side and field-side serial cables with independent wiring trunking to avoid signal crosstalk
3. Power supply wiring adopts 1.0mm² cross-section copper wire; terminal screw torque fixed at 0.7 N·m
4. Cabinet must equip ground copper bar; module housing earth terminal connected to cabinet protective earth
5. Ambient cabinet temperature maintained below 65°C; forced cooling fan required for power plant cabinet high heat load

Usage Notes

1. Prohibit connection of serial signal lines with voltage exceeding 48VDC to avoid breakdown of isolation components
2. Field side serial cable must use shielded twisted pair wire; shielding layer single-point grounded at field equipment cabinet only
3. Conduct annual 2500VAC withstand voltage insulation testing for all communication channels
4. Do not install the module adjacent to frequency converters or high-power contactors to reduce electromagnetic interference
5. Store spare modules in low-humidity sealed packaging with desiccant bags