DS3800HFPG1D1D | 8-Channel Smart Pulse Input with Lock Terminals

Description

Product Introduction

The DS3800HFPG1D1D is the fully-featured diagnostic frequency input board—locking terminals, 2.5A fusing on both banks, and the full suite of diagnostics. This board gives you the highest level of protection for long cable runs (up to 500 meters) while providing signal presence and frequency validity monitoring on all eight channels. The 2.5A fuses on both banks eliminate nuisance trips caused by cable capacitance, and the locking terminals ensure signal integrity in high-vibration environments. The 24V DC input capability matches modern proximity sensors and solid-state pulse generators.

We’ve used this board in a long-distance pipeline application where the frequency inputs came from flow meters located 400 meters away. The 2.5A fuses handled the cable capacitance without nuisance trips, and the diagnostics flagged a sensor that was intermittently dropping out due to a failing power supply. The locking terminals were critical—the pipeline compressor had significant vibration, and the terminals held up without any intermittent connections. The HFPG1D1D is the most capable frequency input board we’ve used on the Mark V platform.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: Why does the HFPG1D1D have 2.5A fuses on both banks?
A: The 2.5A fuses are for applications with long cable runs (over 100 meters) where cable capacitance can cause inrush currents on power-up. The 2.5A rating provides headroom for these inrush currents while still protecting the board from shorts. If you have a mix of short and long cable runs, the 1D1C (mixed 2.5A/1A) might be more appropriate. The 1D1D is the full high-capacity configuration.

Q: What diagnostics does the HFPG1D1D provide?
A: The HFPG1D1D provides per-channel signal presence detection (is there a pulse?) and frequency validity monitoring (is the frequency within a valid range?). The diagnostics are reported via the backplane and via bi-color LEDs on the board. This allows you to detect a failed sensor, a broken wire, or a sensor that’s not producing a valid signal. The HFPC has no such diagnostics.

Q: How do the diagnostic LEDs work on the HFPG1D1D?
A: The HFPG1D1D uses bi-color LEDs (green/red). Green indicates a valid signal is present on the channel. Red indicates a fault condition—either no signal (sensor failure or wiring open) or an invalid frequency (signal too high or too low). This provides immediate visual feedback for troubleshooting.

Q: What’s the advantage of the locking terminals on the 1D suffix?
A: The locking terminals have a plastic latch that prevents the wire from pulling out under vibration. This is particularly important for frequency inputs, where intermittent connections can cause speed measurement errors or overspeed trip events. The locking mechanism is a simple but effective solution for high-vibration environments.

Q: Does the HFPG1D1D require a software update to use the diagnostics?
A: Yes. The HFPG1D1D’s diagnostics are mapped to the Mark V’s I/O status registers. You’ll need to update your Mark V configuration to read these registers. The specific register mapping is in GE’s application manual (GEI-100873). It’s a straightforward update—typically about 1-2 hours of configuration work. If you’re upgrading from an HFPC, you’ll also need to update the controller’s hardware configuration to recognize the HFPG.

Q: The HFPG1D1D has a 0.9A backplane current draw. Is that higher than the HFPC?
A: Yes, the HFPG1D1D draws 0.9A, which is 0.1A more than the HFPC (0.8A). The extra current is for the diagnostic circuitry. If your rack is near the power supply limit, this small increase could be significant. The Mark V power supply is typically rated at 6A on the 5V rail. If you have multiple HFPG boards, check your total backplane current. We recommend keeping total backplane current below 5.5A for margin.

Q: Does the HFPG1D1D have conformal coating?
A: Not by default. The 1D1D suffix indicates locking terminals and 2.5A fusing, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HFPG1G1G). The standard HFPG1D1D is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

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