Model Definition

• 0-52876: VTGA (Voltage/Tachometer Gate Array) Board

• VTGA = Voltage/Tachometer Gate Array (ASIC-integrated V/T control)

• Function: Replaces discrete analog/digital circuitry (VTAB/VTDB) with a custom gate array for compact, reliable control

• Complementary boards: Interfaces with DCGA (0-52861), CLSA (0-52862), VSAC (0-52868), VCDA (0-52869)

Technical Specifications

• Board Type: 18D plug-in PCB, edge connector, metal faceplate (2 locking screws)

• Core Component: Custom gate array ASIC (integrates 1000+ logic gates)

• Function: Tachometer signal conditioning, voltage loop regulation, speed reference processing, fault logic, A/D conversion

• Compatibility: MaxPak Plus / AutoMax PMI VS spindle drives (15–150 HP, mid-range production units)

• Components: ASIC, optocouplers, EEPROM, status LEDs, trim potentiometers (calibration)

• Weight: ~0.91 kg (2.0 lbs)

• Status: Discontinued; NOS/refurbished/used only

Interfaces & Communication

• Edge Connector: Backplane connection for ±15V power, tach input, speed reference, fault output

• Tach Input: Isolated analog (0–10V) tachometer signal

• Speed Ref: 0–10V analog setpoint or potentiometer-adjustable

• Diagnostics: 3 onboard LEDs (Power, Fault, Loop Status)

• Isolation: 1500Vrms between ASIC and power stage

• Fieldbus: None; analog I/O with ASIC logic

Key Features

• ASIC integration: Combines VTAB (analog) and VTDB (digital) functions into one chip, reducing component count and failure points

• Compact design: Smaller footprint than discrete boards, optimizing rack space

• Enhanced reliability: Fewer solder joints and discrete components improve Mean Time Between Failures (MTBF)

• Factory-calibrated: EEPROM stores calibration data, minimizing field adjustment

• Direct plug-in: 18D form factor compatible with existing VS drive racks

• Conformal coating: Protected against dust, moisture, and vibration in industrial environments

Application

• Reliance MaxPak Plus / AutoMax PMI VS spindle drives (mid-range 15–150 HP)

• CNC spindle motors requiring integrated, compact control (milling/turning centers)

• Legacy drive upgrades (replacing older VTAB/VTDB boards with a single VTGA)

• Systems prioritizing high reliability and reduced maintenance