Model Definition

• 0-52875-1: VTDB (Voltage/Tachometer Digital) Board

• VTDB = Voltage/Tachometer Digital (digital speed/voltage control)

• -1: Revision 1 (standard digital board for VS drives)

• Function: Digitizes tach feedback, executes digital speed/voltage loops, replaces analog VTAB (0-52874-1) in upgraded systems

• Complementary boards: Works with DCGA (0-52861), CLSA (0-52862), VSAC (0-52868), VCDA (0-52869), VTAB (0-52874-1)

Technical Specifications

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

• Function: Digital tachometer signal conditioning, digital speed/voltage loop control, fault diagnostics, analog-to-digital (A/D) conversion

• Compatibility: MaxPak Plus / AutoMax PMI VS spindle drives (15–150 HP, digital upgrade systems)

• Components: Digital signal processor (DSP), A/D converters, optocouplers, EEPROM (calibration data), status LEDs

• Weight: ~0.91 kg (2.0 lbs)

• Status: Discontinued; NOS/refurbished/used only

Interfaces & Communication

• Edge Connector: Connects to backplane for ±15V control power, tach input, speed reference, serial diagnostic link

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

• Speed Ref: Analog (0–10V) or digital setpoint input

• Diagnostics: Onboard LEDs for power, fault, and loop status

• Isolation: 1500Vrms between digital logic and power stage

• Fieldbus: None; digital control with analog I/O

Key Features

• Digital precision: Replaces analog VTAB (0-52874-1) for tighter speed regulation (±0.01%)

• Integrated diagnostics: Onboard LEDs simplify fault troubleshooting

• EEPROM storage: Retains calibration data without battery backup

• Fast transient response: DSP-based control stabilizes heavy machining loads

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

• Industrial robustness: Conformal coating for high-vibration, high-dust environments

Application

• Reliance MaxPak Plus / AutoMax PMI VS spindle drives (digital upgrade, 15–150 HP)

• CNC spindle motors requiring high-precision speed control (milling/turning centers)

• Legacy drive modernization (replacing analog VTAB boards)

• Systems needing digital diagnostics and calibration retention

Notes