ABB DP640 Rotational Speed Meter Module

The ABB DP640 is a rotational speed meter module designed for real-time speed monitoring and overspeed protection within ABB Advant Controller 110–160 series systems. It processes high-frequency pulses from speed sensors on rotating machinery such as turbines, compressors, and large electric motors. The module incorporates overspeed trip logic and dual output channels to trigger safety interlocks upon detecting excessive rotational speeds.

Frequency Input and Direction Detection

The module accepts primary speed measurement inputs up to a maximum frequency of 50 kHz. A secondary speed input channel enables rotational direction detection by evaluating the phase relationship between dual pulse signals, providing comprehensive speed and directional feedback for diagnostics and control loops.

Trip Logic and Output Configurations

Internal overspeed trip logic evaluates measured pulse frequencies against configured limits. When a fault condition occurs, the DP640 actuates dedicated outputs to initiate protective actions:

• 24 VDC Solid-State Output: Provides fast electronic switching for control system logic interfaces.
• 60 VDC Dry Contact Relay Output: Offers isolated switching for external safety interlocks and tripping circuits.

Frequently Asked Questions

Q: What is the maximum input signal frequency supported by the ABB DP640? A: The module accepts speed sensor pulse inputs up to a maximum frequency of 50 kHz.

Q: How does the DP640 handle overspeed trip switching? A: It features built-in overspeed trip logic that drives a 24 VDC solid-state output and a 60 VDC dry contact relay output for system tripping.

Q: Which ABB controller systems accept the DP640 speed module? A: The DP640 is designed for integration into ABB Advant Controller 110–160 series architectures.