Ametek / VTI Instruments / VXI Technology VT1415A Algorithmic Closed Loop Controller

The Ametek VT1415A is a C-size, single-slot VXI algorithmic closed-loop controller designed for precision test, measurement, and process control applications. This register-based A16 slave module executes deterministic control algorithms on dedicated on-board DSP firmware, eliminating drift and jitter in time-critical calculations involving integrals and derivatives. It bridges the gap between standard PID controllers and custom control systems, offering advanced algorithmic capabilities with simplified implementation.

– Technical Specifications

Module Architecture
• C-size, single-slot VXI form factor
• Register-based A16 slave device
• On-board DSP firmware with deterministic clock control

Control Capabilities
• Eight independent control loops
• Maximum loop update rate: 3 kHz (single loop) / 8 kHz (eight loops) for default PID algorithm
• Basic configuration: up to 1000 Hz per loop update rate
• Loop timing deterministically controlled by internal clock, independent of algorithm execution time
• Pre-written PID algorithms with modification support
• Custom algorithm development from algebraic expressions and flow constructs (IF, THEN, ELSE)
• On-the-fly algorithm and tuning constant updates

Data Acquisition
• Multi-function analog and digital input/output
• Analog scanning A/D: ±16 V full-scale with auto-ranging gains (x1, x4, x16, x64, x256)
• Digital capabilities: static state sensing/setting, frequency and period measurement, totalizing, PWM and FM signal input/output
• Double-buffered architecture for continuous scanning and algorithm execution
• Signal Conditioning Plug-on (SCP) module support for input protection and conditioning

Performance & Accuracy
• Typical accuracy: ±0.01% of input level (varies with SCP module)
• Drift error: 10 µV/°C ÷ SCP gain per °C change beyond 5-minute warm-up window
• Specifications valid: 90 days, 23 °C ± 1 °C following 1-hour warm-up and calibration
• Single-sample accuracy; multi-sample averaging reduces noise

– Key Features

• Deterministic execution prevents drift in integral and derivative calculations
• Flexible algorithm development environment with minimal system complexity
• High loop update rates support demanding real-time control requirements
• Double-buffered architecture ensures continuous operation during algorithm updates

– Typical Applications

• Precision closed-loop control systems
• Test and measurement data acquisition
• Process control with multiple simultaneous loops
• Real-time signal conditioning and analysis

– Compatibility & Integration

Requires Signal Conditioning Plug-on (SCP) modules for signal protection and conditioning. Operates within standard VXI instrument chassis architecture.