Digital guide
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GE 994D129G5994D128-0
Product Introduction: The GE 994D129G5994D128-0 is a multifunction digital controller combining the 994D129 (synchrocheck/controller) and 994D128 (frequency/load controller) into a single configuration for generator set grid connection synchronization, frequency regulation, and power control. “994D” denotes the 994D series digital controller; “129” indicates synchrocheck relay/controller function; “G5” is configuration version 5; “994D128” is the frequency/load controller; “0” is the base version.
Detailed content
Technical Specifications — 994D129 (Synchrocheck):
- Function: Synchrocheck
- Voltage input: 110 V / 220 V AC or DC
- Frequency measurement range: 45–65 Hz
- Phase difference detection: 0°–360° (accuracy ±1°)
- Slip detection: 0.1–10 Hz/s (adjustable)
- Closing permit conditions: voltage difference ≤ 10%, frequency difference ≤ 0.5 Hz, phase difference ≤ 10°
- Power: 110 V / 220 V AC/DC
- Communication: RS-485 (Modbus)
- Protection rating: IP54
Technical Specifications — 994D128 (Frequency/Load Controller):
- Function: Frequency regulation / Power control
- Frequency input: 4–20 mA or pulse
- Power input: 4–20 mA (from power transducer)
- Frequency control accuracy: ±0.01 Hz
- Power control accuracy: ±1%
- Output: 4–20 mA (valve command)
- Power: 110 V / 220 V AC/DC
- Communication: RS-485
- Protection rating: IP54
Combined Features:
- 994D129: automatically detects synchronizing conditions (voltage, frequency, phase) before grid connection, issues closing permit when conditions are met
- 994D128: receives frequency/power signals, regulates unit output, maintains grid frequency stability
- G5 configuration: specific parameter presets for particular units
- Event recording and fault waveform capture
- RS-485 communication supporting remote monitoring
Material Composition:
- Housing: flame-retardant ABS (UL94 V-0)
- Front panel: polycarbonate transparent cover
- Terminals: copper alloy with nickel plating
Structural Features:
- 96 mm × 96 mm panel cutout mounting
- Front panel LED display + push buttons
- Rear panel wiring terminals
Application Scenarios: Power plant grid connection control, diesel generator set control, microgrid control, industrial generator set synchronization.
Installation Requirements:
- 96 mm × 96 mm panel cutout
- Use shielded cable for voltage/frequency signal lines
- Use shielded twisted pair for RS-485 communication with terminating resistor
- Connect power per rated voltage
Usage Notes:
- Synchrocheck parameters (voltage difference, frequency difference, phase difference limits) must be set according to grid requirements
- 994D128 power signal must come from a calibrated power transducer
- Regularly test synchrocheck function for correct operation
- Communication address must align with upper-level system planning
