GE DS3820LFRA

Key Parameters

• Channels: 4 analog outputs

• Output Type: 0–10 V (voltage)

• Output Resolution: 16-bit (0.0015% of full scale)

• Accuracy: ±0.05% of full scale (25°C); ±0.15% over –40°C to +70°C

• Output Load: Minimum 1 kΩ (up to 10 mA per channel)

• Settling Time: < 5 ms (to 0.1% of final value)

• Diagnostics: Per-channel short-circuit detection, open-wire detection, over-temperature alarm, per-channel LED status

• Fail-Safe States: Software-configurable per channel (hold last value, go to 0 V, go to 10 V, or user-defined preset) on communication loss

• Isolation: 1500 V RMS (field-to-backplane); 500 V RMS between channels

• Power: 24 V DC backplane power, ≤3 W (plus external field supply)

• Operating Temperature: –40°C to +70°C

• Terminals: Screw-type (suffix-dependent)

Advantages

• High 16-bit resolution – provides precise analog control for demanding process applications.

• Open-wire detection – detects broken output wiring or disconnected loads; alerts operators for proactive maintenance.

• Per-channel short-circuit protection – auto-restart protection; eliminates external fuses and reduces downtime.

• Software-configurable fail-safe – define output behavior (hold, 0 V, 10 V, or preset) on communication loss for safe system shutdown.

• Fast settling time – < 5 ms for dynamic control loops.

• High channel density – 4 outputs in a single slot; saves rack space.

• LED status indicators – per-channel visual indication for quick troubleshooting.

• Hot-swappable – replace without rack power-down.

• Optical isolation – protects backplane from field transients.

Applications

• VFD speed control – providing 0–10 V reference signals to variable frequency drives

• Proportional valve control – precise positioning of hydraulic and pneumatic valves

• Actuator positioning – controlling electric actuators for dampers and valves

• Chart recorder output – providing analog signals for data logging and recording

• Panel meter drive – driving analog panel meters and indicators

• Process control – setpoint output for temperature, pressure, and flow controllers

• Test & measurement – generating precision voltage signals for simulation and testing

Competitor Comparison

The DS3820LFRA is the high-resolution analog output module with 16-bit resolution and diagnostic features. Compared to standard 12-bit output modules, it provides 16× finer resolution and adds open-wire detection, per-channel fail-safe configuration, and short-circuit protection – essential for precision control applications. Against competitor 16-bit modules, the DS3820LFRA offers comparable performance with superior diagnostics (open-wire detection) at a lower cost. For demanding process control applications requiring high precision and reliability, the DS3820LFRA delivers the most cost-effective solution.

Selection Tips

• Choose DS3820LFRA when you need high-precision analog outputs (16-bit) for VFD control, valve positioning, or process setpoints.

• Ideal for applications requiring fine control resolution and diagnostic feedback.

• Verify the output type matches your field devices – provides 0–10 V only (not 4–20 mA).

• Consider the fail-safe behavior – configure each channel for the safe state on communication loss.

• Not suitable for 4–20 mA current-loop devices – use the DS3820LFRI variant for current outputs.

• Ensure your PLC/DCS can read and process diagnostic data from the DS3820LFRA.

Precautions

• Output load: Do not exceed 10 mA per channel (minimum 1 kΩ load). Driving lower impedance loads may cause output voltage drop and overheating.

• Wiring: Use shielded twisted-pair cables for analog outputs to reduce EMI. Ground shield at module end only.

• Inductive loads: The DS3820LFRA is not designed for direct inductive loads – use external buffers or isolators for inductive actuators.

• Fail-safe testing: Test fail-safe behavior during commissioning – confirm outputs go to the desired state on communication loss.

• Open-wire detection: Requires a minimum load current – very high-impedance loads (>1 MΩ) may not trigger open-wire detection.

• Power: Requires external 24 V field supply – ensure supply capacity for output loads.

• Grounding: Maintain proper grounding to avoid ground loops that could affect output accuracy.

• Calibration: Perform periodic calibration using a precision multimeter to maintain accuracy – the DS3820LFRA includes internal reference but drift may occur over time.

• Spare: Keep one spare DS3820LFRA for critical control applications – the high-resolution feature set may have longer lead times.