DS3800HFPE1D1B | GE Mark V 5V DC Frequency Input Module

Description

Product Introduction

The DS3800HFPE1D1B is the 5V frequency input board with locking terminals and asymmetric fusing—one bank with 2.5A fuses, the other with 0.8A. This board gives you the flexibility to assign higher-current circuits (like long cable runs with high capacitance) to the 2.5A bank while keeping low-current sensors on the 0.8A bank. The locking terminals (1D) provide the same vibration-resistant connection we’ve seen on other boards—essential for frequency inputs where signal integrity is critical. The board’s 5V TTL-compatible inputs are designed for modern sensors like hall-effect devices and encoders.

We’ve used the HFPE1D1B in a turbine test facility where vibration was a constant issue. The locking terminals eliminated the intermittent signal loss we’d experienced with standard spring-cage terminals. The 2.5A bank was dedicated to the speed sensor cables, which ran 150 meters through conduit—the higher fuse rating handled the cable capacitance without nuisance trips. The 0.8A bank was used for the flow meters, which had shorter runs. The board’s performance was rock-solid throughout the testing campaign.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: Why does the HFPE1D1B have mixed fusing (2.5A and 0.8A)?
A: The mixed fusing allows you to split frequency inputs between higher-current and lower-current circuits. The 2.5A bank is suitable for long cable runs (over 100 meters) where cable capacitance can cause inrush currents on power-up. The 0.8A bank is for shorter runs or sensors with low capacitance. This provides flexibility while maintaining protection. The sensors themselves draw only 1mA each—it’s the cable capacitance that drives the need for higher fuse ratings.

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. The 1D suffix is the locking version of the 1B spring-cage.

Q: Can I use the HFPE1D1B with a hall-effect sensor that outputs a 5V pulse?
A: Yes, the HFPE1D1B is designed for 5V TTL-level inputs. Hall-effect sensors typically output a 5V pulse when a target passes, which the board counts. The input voltage range (4.5-5.5V DC) covers standard TTL outputs. The 4.7kΩ input impedance is high enough not to load the sensor.

Q: What’s the frequency range of the HFPE1D1B?
A: The HFPE1D1B measures frequencies from 0Hz to 10kHz, with ±0.1% accuracy. This covers the typical speed range of 60Hz turbines (up to 7.2kHz for a 120-tooth gear). The 12-bit resolution provides a count value for the Mark V to calculate speed. If you need higher frequencies (up to 100kHz), consider other frequency input variants.

Q: How do the locking terminals work on the HFPE1D1B?
A: After inserting the wire into the spring cage, you flip down the plastic latch until it clicks. The latch presses against the wire insulation, preventing the wire from pulling out even if the spring tension loosens. To release the wire, lift the latch with a small screwdriver, then press the spring release. The mechanism adds a few seconds per termination but significantly improves vibration resistance—critical for frequency inputs.

Q: Does the HFPE1D1B require ferrules for stranded wire?
A: Yes, we strongly recommend ferrules for stranded wire with spring-cage terminals, even with the locking mechanism. Stranded wire without a ferrule can splay under spring pressure, leading to intermittent connections. Ferrules provide a solid, round profile that the spring grips uniformly. The locking latch won’t compensate for poor wire preparation. Use ferrules or solid wire for reliable terminations.

Q: Does the HFPE1D1B have conformal coating?
A: Not by default. The 1D1B suffix indicates locking terminals and mixed fusing, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HFPE1G1B). The standard HFPE1D1B is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

GE DS200TCDAF1ACL
GE DS200TCDAF1ACM
GE DS200TCDAF1ACN
GE DS200TCDAF1BCE