Model Definition

• 0-52862: Base CLSA board (Rev A/B)

• 0-52862-C: Rev C, upgraded CLSA (current limit snubber assembly)

• CLSA = Current Limit Snubber Assembly (5–10 HP AC drives)

• -C = Third factory revision with upgraded components and tighter tolerances

Technical Specifications

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

• Function: Current limiting, RC snubber network, voltage spike suppression, transient overvoltage protection, fault buffering

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

• Components: Higher-grade power resistors, high-voltage film capacitors, enhanced MOVs, improved snubber diodes (vs. Rev A/B)

• Weight: ~0.91 kg (2.0 lbs)

• Status: Discontinued by OEM; available as NOS, refurbished, or used

Interfaces & Communication

• Edge Connector: Power, DC bus, and fault signal interface to drive rack backplane

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

• Isolation: High-voltage isolation between control logic and power stage

• Fieldbus: None; hardware-only protection

Key Features (vs. 0-52862 Rev A/B)

• Rev C Upgrades: Tighter component tolerances, improved thermal stability, higher surge current rating

• Enhanced Snubbing: Suppresses larger voltage spikes/transients, reduces semiconductor stress

• Robust Protection: Hardware current limiting with faster response, better short-duration overload tolerance

• Drop-In Compatible: Direct replacement for 0-52862 in existing racks (no wiring changes)

• Longer Service Life: More reliable in high-noise, high-vibration industrial environments

Application

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

• CNC machine tool spindle motor control

• Legacy AC drive power stage protection, snubber replacement, and upgrade

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