3A99118G02
Description
1. Product Overview & Key Upgrade vs G01 Version
Optimized output drive circuit, improved anti-surge & field short-circuit endurance for heavy inductive load (servo coil, valve positioner)
Updated reference voltage chip, full-scale accuracy upgraded from ±0.2%FS (G01) to ±0.15%FS
Enhanced EMI filtering circuit for high-interference power plant cabinet environment
Optimized temperature drift compensation to reduce zero drift under wide ambient temperature fluctuation
Core Function
Receive digital control commands via Q-Line Multibus backplane from DPU controller
D/A conversion to generate standard industry analog signals for field servo valves, steam control valves, feedwater actuators
Channel isolation + fault diagnostic feedback, send channel failure alarm to rack backplane for system diagnosis
Cooperate with QRD analog input board to build closed-loop turbine speed/load/valve opening regulation loop
2. Electrical Technical Parameters
Channel Configuration
Total: 4 independent galvanically isolated output channels
Configurable via onboard jumper: Default factory setting = 4~20mA DC current output; optional: 0~5V,0~10V,±10VDC voltage output
| Parameter | Specification |
|---|---|
| D/A Resolution | 16-bit |
| 4~20mA Max Load Resistance | ≤600Ω (G01 max 500Ω, G02 load capacity improved) |
| Channel Isolation Voltage | 1500VAC between field side & backplane bus |
| Output Accuracy | ≤±0.15% Full Scale |
| Ripple Noise | ≤10mVpp |
| Working Power | +5V, ±12VDC from crate MDPS power supply(3A99116G01) |
Built-in Protection (G02 enhanced design)
Per-channel independent constant current limiting against field short circuit
Backplane over/under voltage lockout protection
Overtemperature shutdown protection when PCB core temp＞75℃
3. Environmental Specifications
Operating Temperature: 0℃ ~ +55℃ (cabinet indoor installation)
Storage Temperature: -40℃ ~ +85℃
Humidity: 5%~95%RH non-condensing, no corrosive gas & conductive dust
EMC: Comply with IEC61000 industrial EMC standard for power station heavy electromagnetic interference
4. Installation & Calibration Instruction
Standard Q-Line plug-in design, directly insert into vacant slot of 9-slot Q-crate; backplane auto power & bus connection after insertion
Cross-replacement allowed: G02 can fully substitute original G01 without rack wiring modification
Post-installation steps:
① Power on rack without connecting field load first
② Calibrate zero point (4mA) and full scale (20mA) via front panel test terminals
③ After calibration finished, connect field actuator wiring
5. Application Range
Main steam control valve, governing oil servo actuator analog drive output
Feedwater flow regulation, reheater valve closed-loop control
Match full Q-Line series spare parts: QRD(AI), QRF(RTD input), QSR(servo control), MDPS(power source)
6. Spare Part & Maintenance Info
OEM original production discontinued; available stock: factory-tested refurbished card / used inspected original spare parts
Standard repair cycle: 2~4 weeks; emergency expedited maintenance available, global shipment via DHL/UPS/FedEx
Warranty: Standard 12-month after-sales warranty for tested replacement modules
7. Common Troubleshooting Guide
All four channels no output: Check crate backplane +5V/±12V power from 3A99116G01 MDPS power board & rack input fuse
Single channel output drift: Re-cal zero/span via front test port, check field cable short or overload
Signal fluctuation randomly: Verify jumper matches required output type, inspect cabinet grounding & field shielding wiring
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