DS3800HFPE | Mark V Speedtronic Low-Voltage Counter Card

Description

Product Introduction

The DS3800HFPE is the 5V DC version of the frequency input board, designed for applications where sensors output TTL-level signals rather than 24V DC or 120V AC. This board accepts 5V DC logic-level inputs from encoders, solid-state pulse generators, and integrated circuits—common in modern electronic sensor systems and some retrofit applications. The 5V input capability makes the HFPE compatible with a wide range of digital sensors without the need for level shifting. The board’s 8-channel capacity and 0-10kHz frequency range are the same as the HFPC, but the input impedance is higher and the current draw is lower.

We’ve used the HFPE in a test cell application where the speed sensors were hall-effect devices with 5V outputs. The board’s TTL-compatible inputs accepted the sensors directly, eliminating the need for external signal conditioning. The 0.5A field supply fuses (suffix-dependent) were more than adequate for the sensors, which draw only a few milliamps. The board’s scan rate is 10ms, providing sufficient resolution for speed measurement and overspeed detection. If you’re converting from a 24V DC system to 5V logic, the HFPE is the board you need.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the difference between the HFPE and the HFPC?
A: The HFPE accepts 5V DC TTL-level inputs, while the HFPC accepts 24V DC inputs. The HFPE has a lower input current (1mA vs 5mA) and a lower input voltage range. The HFPE is for applications where sensors output logic-level signals, such as encoders or hall-effect sensors. The HFPC is for industrial proximity sensors that output 24V DC.

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

Q: What’s the frequency range of the HFPE?
A: The HFPE 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: The HFPE has a 0.7A backplane current draw. Is that lower than other frequency boards?
A: Yes, the HFPE draws 0.7A, which is lower than the HFPC (0.8A) and HFPB (1.0A). The lower current is due to the reduced power consumption of the 5V inputs and the simpler input conditioning circuitry. This is an advantage if your rack is near the power supply limit.

Q: Can I use the HFPE for flow meter pulse counting?
A: Yes, if the flow meter outputs a 5V logic-level signal. The HFPE can count pulses and provide a totalization value to the Mark V. However, the 10ms scan rate may not be sufficient for high-frequency flow meters (>10kHz). Check your flow meter’s output frequency before choosing the HFPE.

Q: Does the HFPE have conformal coating?
A: Not by default. The HFPE’s suffix typically indicates termination type, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HFPE1G1G). The standard HFPE is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

Q: The HFPE has TTL-compatible inputs. What does that mean?
A: TTL-compatible inputs mean the board accepts logic signals with a high threshold of 2.0V and a low threshold of 0.8V (standard TTL levels). This makes the HFPE compatible with most integrated circuits, microcontrollers, and digital sensors. The inputs are optically isolated for protection against transients. The 4.7kΩ input impedance does not load the signal source significantly.

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