Model Definition

• 0-52874-1: VTAB (Voltage/Tachometer Analog) Board

• VTAB = Voltage/Tachometer Analog (analog speed/voltage control)

• -1: Revision 1 (standard revision for VS drives)

• Function: Conditions tachometer feedback, sets speed reference, stabilizes voltage loop

• Complementary boards: Works 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)

• Function: Tachometer signal conditioning, speed reference adjustment, voltage analog control, speed loop stabilization

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

• Components: Precision op-amps, trim potentiometers (speed/voltage calibration), analog multiplexers, signal isolation circuits

• Weight: ~0.91 kg (2.0 lbs)

• Status: Discontinued; NOS/refurbished/used only

Interfaces & Communication

• Edge Connector: Connects to backplane for ±15V control power, tachometer input, speed reference, analog output

• Tach Input: Isolated analog tachometer signal (0–10V or 0–20mA)

• Speed Ref: Potentiometer-adjustable speed setpoint

• Analog Out: Scaled speed/voltage signal to other control boards

• Isolation: Low-level signal isolation (500Vrms)

• Fieldbus: None; analog-only control

Key Features

• Precision tachometer signal conditioning for spindle speed feedback

• Onboard trim pots for speed calibration and voltage loop tuning

• Stabilizes speed regulation under heavy machining loads

• Interfaces directly with DCGA/CLSA/VSAC/VCDA boards in VS drive racks

• Standard 18D plug-in form factor for easy replacement

• Industrial analog components for high-noise environments

Application

• Reliance MaxPak Plus / AutoMax PMI VS spindle drives (all HP ratings)

• CNC spindle motor speed control (milling/turning centers)

• Legacy drive analog signal conditioning and speed loop repair

• Systems requiring precise tach feedback and voltage regulation