Model Definition

Technical Specifications

• Board Type: 18D plug-in PCB, edge connector, no user pots

• Function: SCR gate pulse generation, electrical isolation, firing angle synchronization, overcurrent gating protection

• Components: Pulse transformers, high-voltage transistors, opto-isolators, snubber networks, thick-film resistors

• Compatibility: Reliance MaxPak / AutoMax DC drives (50–500 hp)

• Weight: Approx. 0.34 kg

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

Interfaces & Communication

• Edge Connector: Power, sync, and control signals from drive rack

• Gate Outputs: Isolated pulse outputs to SCR gates (firing circuit)

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

• Fieldbus: None; analog firing commands only

Key Features

• Isolated, high-energy gate pulses for reliable SCR triggering

• Precision synchronization with line voltage for accurate firing angle

• Built-in snubbers and spike suppression for noise immunity

• Fault gating logic to prevent SCR damage on overcurrent

• Direct plug-in replacement for DC drive gate driver sections

Application

• Reliance MaxPak / AutoMax DC drives (SCR-based)

• Industrial DC motor control (rolling mills, cranes, extruders, conveyors)

• Legacy DC drive power stage maintenance and SCR firing repair

• Works with 0-52855-2 (CVCC), 0-52860-2 (VSAC) in the same rack