GE DS3860HSCG

Parameters

Advantages & Features

• Dual Counter/Generator Function – The GE DS3860HSCG can independently count pulses on one channel while generating output pulses on another, enabling closed-loop actuator control with minimal controller overhead.

• High-Speed Measurement – With 10MHz input capability, the GE DS3860HSCG can measure high-speed turbine speed signals (up to 600,000 RPM with a 1-pulse-per-revolution sensor).

• Programmable Pulse Output – The GE DS3860HSCG generates precise pulse trains (frequency and duty cycle programmable) for stepping motor control, valve dither, or testing applications.

• Quadrature Decoding – Supports incremental encoders with 1x, 2x, or 4x decoding for high-resolution position feedback.

• Capture/Compare Registers – The GE DS3860HSCG includes capture registers for time-stamped event logging and compare registers for generating interrupts or output events at specific counter values.

• Integrated Diagnostics – Continuous monitoring detects input open-circuit, over-frequency, and missing pulses, with faults reported to the Mark VIe controller.

Application Cases

• Turbine Speed Measurement – The GE DS3860HSCG measures speed signals from two independent magnetic pickups on a steam turbine, providing redundant speed inputs for governor control and overspeed protection.

• Flow Meter Pulse Counting – In a chemical plant, the GE DS3860HSCG counts pulses from 8 turbine flow meters (0–10kHz), providing totalized flow and instantaneous flow rate data to the Mark VIe controller.

• PWM Valve Control – The GE DS3860HSCG generates PWM signals (1kHz, variable duty cycle) to control proportional solenoid valves in a hydraulic control system, eliminating the need for separate PWM driver modules.

• Encoder Position Feedback – The GE DS3860HSCG reads quadrature encoder signals from a robotic actuator, providing high-resolution position feedback for precise motion control.

Competitor Comparison

The GE DS3860HSCG offers the highest channel count (8), highest input frequency (10MHz), and unique pulse output capability — features not matched by Siemens, ABB, or Rockwell.

Selection Suggestions

• Choose the GE DS3860HSCG when you need high-speed counting (up to 10MHz) on multiple channels, or when you require programmable pulse output in the same module.

• If your application requires only frequency measurement (no pulse output), the lower-cost DS3860HSC variant (without -G) may be sufficient.

• For encoder feedback applications, use the GE DS3860HSCG with 4x quadrature decoding for maximum resolution.

• For PWM valve control, select the GE DS3860HSCG output frequency that matches the valve’s response characteristics (typically 50Hz–5kHz). Avoid frequencies that may cause valve resonance.

• Pair with matching terminal block TB300-HSC (with shielded connections for high-frequency inputs).

Precautions

• Input Threshold Setting – The GE DS3860HSCG uses programmable voltage thresholds. Set the threshold to 50% of the expected signal amplitude. Too high a threshold may miss pulses; too low may trigger on noise.

• Cable Quality – For high-frequency signals (>1MHz), use low-capacitance shielded coaxial or twisted-pair cable (<50pF/m) and keep cable runs as short as possible (<15m). Signal attenuation can cause missed counts.

• Grounding – Connect cable shields to the GE DS3860HSCG common terminal at the module end only. Do not ground shields at both ends to avoid ground loops.

• Output Loading – The GE DS3860HSCG output is limited to 10mA. For higher drive current, use an external buffer amplifier.

• PWM Output Filtering – For analog control applications, the PWM output may require external low-pass filtering (RC or active filter) to convert the digital PWM signal to a smooth analog voltage.

• Counter Rollover – The 32-bit counter rolls over after 4.29 billion counts. For applications counting at 10MHz, this occurs every 429 seconds (~7 minutes). Implement rollover handling in the controller logic.

• Missing Pulse Detection – The missing pulse diagnostic triggers if no pulse is detected within the expected time window. For variable-speed applications, set a wide enough window (e.g., 200ms) to avoid false alarms during startup.

• Power Supply – The GE DS3860HSCG draws 450mA from 5V. Verify the power supply module has sufficient 5V capacity.

• Calibration – The internal timebase is factory-calibrated. Field recalibration is not required.

• ESD Handling – Use ESD-safe practices when handling the GE DS3860HSCG. High-frequency inputs are particularly sensitive to static discharge.