Model Definition

Technical Specifications

• Board Type: 18D plug-in PCB, edge connector, metal faceplate with two locking screws

• Function: Current limit regulation, RC snubber network, voltage spike suppression, transient protection

• Compatibility: Reliance MaxPak Plus / AutoMax PMI VS spindle drives (5–10 HP)

• Components: Power resistors, high-voltage capacitors, metal oxide varistors (MOVs), surge suppressors

• Weight: Approx. 0.91 kg (2.0 lbs)

• Status: Discontinued by OEM; NOS / refurbished / used only

Interfaces & Communication

• Edge Connector: Connects to drive rack backplane for power and fault signals

• Power I/O: Hardwired to DC bus and power switching devices (IGBTs/SCRs)

• Isolation: High-voltage isolation between control and power sections

• Fieldbus: None; hardware-based protection only

Key Features

• Integrated current limiting and RC snubber for AC drive power stages

• Suppresses voltage spikes and transients to protect semiconductors

• Hardware fault buffering to prevent drive shutdown on short-duration overloads

• Robust industrial-grade components for high-noise environments

• Direct plug-in replacement for CLSA boards in 5–10 HP MaxPak Plus racks

Application

• Reliance MaxPak Plus / AutoMax PMI VS spindle drives (5–10 HP)

• Industrial AC spindle motor control (machine tools, CNC spindles)

• Legacy AC drive power stage protection and snubber replacement

• Works with 0-52860-2 (VSAC), 0-52861 (DCGA) in the same drive rack