GE Mark VIe DS200SHVMG1AFE Preventive Maintenance
Daily Inspection Protocol
| Checkpoint | Acceptance Criteria | Tool |
|---|---|---|
| Heat Sink Temperature | ≤65°C @ ambient 40°C | IR Thermometer |
| LED Status (DS1-DS7) | Solid green (Run Mode) | Visual |
| HV Bus Voltage | Within ±5% of nameplate rating | DMM (1kV range) |
| Fiber Optic Connections | Clean endfaces, no bending radius <30mm | Inspection Scope |
Monthly Maintenance Tasks
1. Power Component Verification
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• DC Link Capacitors:
- ESR ≤ 0.8Ω @ 100kHz
- Capacitance deviation ≤ ±10%
• IGBT Gate Threshold:
Vge(th) = 5.8V ±0.3V (Measure between TP3-GND)
2. Contact Maintenance
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Terminal Block TB1:
Power Terminals: 2.3 Nm ±0.2 Nm
Signal Terminals: 0.6 Nm ±0.1 Nm
Cooling Fan Connector (P4): 1.2 Nm
3. Environmental Protection
- Clean air filters (PM4*-FAN-230A models)
- Apply NO-OX-ID A-Special to copper busbars
- Verify conformal coating integrity (UL 746E)

Critical Calibration (Quarterly)
IGBT Drive Timing
| Parameter | Requirement | Test Point |
|---|---|---|
| Turn-on Delay | 1.8µs ±0.3µs | TP7 (Gate Monitor) |
| Turn-off Delay | 2.2µs ±0.3µs | TP7 (Gate Monitor) |
| Vce Desat Response | ≤3µs | TP12 (Fault Out) |
| Cross-talk Rejection | ΔVge ≤ 1.5V @ 100A/µs | TP3-GND |
Tool Requirement: 100MHz isolated scope with HV differential probe
Fault Recovery Procedure
LED Fault Decoding
| LED Pattern | Action |
|---|---|
| DS4 (Red) Flashing | Vce desat fault – Check IGBT module |
| DS5 (Red) Solid | DC Under-voltage – Verify AUX PSU |
| DS6/DS7 Alternating | Fiber comm error – Clean/replace FO |
Hard Reset Sequence:
- Disable drive (L1 contactor open)
- Wait 5 minutes for DC bus discharge
- Cycle control power (TB2-1/TB2-2)
- Initiate BIT from HMI:
> MAINT > BOARD_TEST > SHVMG1
Mandatory Replacement Intervals
| Component | Service Life | P/N |
|---|---|---|
| Electrolytic Caps | 5 years/50k hrs | 194A3313P1 |
| Optocouplers | 7 years | HCPL-316J-500E |
| Gate Resistors | 10M switching cycles | SHV-RG-1.5OHM |
| Thermal Interface | 3 years | BER114-ND (Gel) |

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