GE DS200SIOBH1ACA Servo Input‑Output Board (SIOB)

Description

Hardware & Electrical Specifications

‑ Model: DS200SIOBH1ACA ‑ Part Number: DS200SIOBH1ACA ‑ Module Type: Mark‑V SIOB Servo Input‑Output VME PCB Board ‑ Mounting: Standard 6U VME slide‑in rack‑mount with front‑panel ejector latches ‑ Logic Power: +5 VDC, ±15 VDC supplied from VME backplane ‑ Signal Interface: LVDT excitation & feedback conditioning; servo‑valve analog command output ‑ Configuration components: 20 jumpers, 3×6‑position DIP‑switch blocks (18 switches total). Must strictly copy original jumper & DIP‑switch positions during replacement ‑ Connectors: VME P1 backplane connector; 40‑pin field‑wiring signal connector ‑ Diagnostics resources: One status‑LED for board operational‑health indication; multiple test‑probe posts for analog‑waveform measurement ‑ PCB treatment: Industrial conformal‑coated multilayer circuit board (‑ACA revision, optimized demodulation & EMI‑filter circuit) ‑ Compatibility note: Exclusively for GE Speedtronic Mark‑V gas‑steam turbine platforms; NOT drop‑in compatible with Mark‑VI / Mark‑VIe. For TMR triple redundant rack, confirm CPU firmware version before replacement. After replacement, duplicate original jumper & DIP‑switch settings, verify full VME backplane engagement, test LVDT feedback and servo‑command amplitude before commissioning actuator loops.

Environmental Specifications

‑ Operating temperature: 0 ℃ ~ +60 ℃ ‑ Storage temperature: −40 ℃ ~ +85 ℃ ‑ Relative humidity: 5%‑95% non‑condensing ‑ Installation location: Indoor turbine‑control cabinet, Pollution Degree 2, IP20 ‑ EMC compliance: Industrial EMC requirements for power‑generation turbine‑control‑room equipment ‑ Certifications: CE, UL compliant for power‑plant control‑system components

Mechanical Data

‑ Board dimension: 233 mm × 160 mm (standard 6U VME form‑factor) ‑ Mounting: VME rack slide‑in assembly with front‑panel ejector latches ‑ Weight: approx 0.34 kg

Main Functions

1. LVDT excitation & feedback signal conditioning Output high‑frequency AC excitation to field LVDT position sensors. Receive differential AC position signals, perform buffer, common‑mode noise suppression, phase‑sensitive demodulation, gain / zero‑offset adjustment, low‑pass filtering, ADC conversion. Convert AC LVDT signal into digital position value and upload to Mark‑V CPU over VME bus for valve‑position PID closed‑loop calculation. ACA revision improves demodulation linearity and low‑level‑signal anti‑noise capability.
2. Servo command output conditioning Receive digital valve‑set‑point commands from CPU via VME bus, complete DAC conversion, signal scaling and offset compensation, output buffered drive signal to field electro‑hydraulic servo‑valve coils, with short‑circuit current‑limiting protection and output‑noise filtering.
3. Hardware configuration 20 jumpers plus 18 DIP‑switches configure LVDT gain range, channel assignment, servo‑drive mode to match field‑actuator hardware parameters.
4. Fault detection & status indication Detect LVDT excitation loss, feedback‑signal over‑range; report fault‑status word to CPU; onboard LED indicates basic board operational‑health for commissioning and troubleshooting.

Installation & Wiring Requirements

1. Cut off rack control power before installation or replacement. Non‑hot‑swappable. ESD wrist‑strap protection is mandatory during board handling.
2. Insert DS200SIOBH1ACA into target VME slot, push fully home to engage VME backplane connectors and lock front‑panel ejector latches. Reproduce jumper‑settings and DIP‑switch positions exactly consistent with original‑board hardware configuration. Fasten the 40‑pin field‑signal connector firmly.
3. All field‑signal wiring must strictly follow Mark‑V system‑wiring drawings. Reliable protective‑earth connection for control cabinet is mandatory.
4. After replacement: Restore rack control‑power. Observe board‑status‑LED state. Measure servo‑command output and LVDT feedback‑signal levels. Complete static‑loop‑verification test before putting valve‑actuator loops into service. For TMR triple‑redundancy system, perform three‑channel consistency comparison test.
5. Replacement note: Wrong jumper / DIP‑switch configuration or poor VME‑connector contact will cause position‑feedback error, valve‑actuator mis‑operation, may lead to turbine‑trip‑events. Full‑system servo‑loop function verification test is mandatory before turbine‑unit commissioning.