Yokogawa AGP813 High-Speed Protection Module

Configured for high-speed signal acquisition and protective execution in Yokogawa systems, the Yokogawa AGP813 (AGP813 High-Speed Protection Module) provides direct physical/electrical execution.

Hardware Specifications

Process Control and DCS Instrumentation

• 4-20 mA and Voltage Signal Loop Isolation: The voltage input channels support 1 to 5 V signal spans (representing standard 4-20 mA loops over a 250 Ohm resistor) and feature robust channel-to-channel and system-to-field isolation. This layout prevents electrical transients from destabilizing the core processing logic during rapid system trips.
• Magnetic Pickup and Active Speed Sensing: The dedicated pulse inputs read frequencies from 50 Hz to 25 kHz on Magnetic Pickup (MPU) lines and 0.04 Hz to 2 kHz on Active Pickup lines. This ensures highly responsive turbine and compressor rotor speed monitoring directly integrated with the safety interlock matrix.

Frequently Asked Questions

Q: What is the step response delay associated with the digital outputs?

A: The digital outputs operate as current-sinking switches (rated for 100 mA at 30 V DC max) and present a typical ON/OFF delay of only 1 ms, ensuring rapid trip signal transmission.

Q: How does the input impedance of the voltage channels react to a module power loss?

A: Under normal powered conditions, the voltage input impedance is 1 M Ohm. If power is removed from the module, the impedance drops to 100 k Ohm to prevent loop interruption or excessive floating voltages.

Field Installation Guidelines

• Dedicated Signal Cable Alignment: Connect the field signals using only the certified Yokogawa cables (AKB337-M005, M007, or M010). Secure the connector latches firmly to prevent contact noise in high-vibration environments.
• Shield Grounding for High-Frequency Inputs: Terminate the shielding of Magnetic Pickup (MPU) and active speed sensor lines at the cabinet grounding bar only. Keep the field-side shield ungrounded to prevent common-mode noise from corrupting the frequency reading.
• External Inductive Load Suppressors: When using digital output channels to drive external inductive relay coils, install flyback diodes directly across the load terminals to protect the current-sinking transistors from inductive voltage spikes.