Digital guide
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Kollmorgen PRD-B040AALZ-A3
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Product Name: External Dynamic Braking Resistor (Regen Resistor) Unit
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Product Introduction: A regenerative (shunt) resistor designed to dissipate kinetic energy returned to the DC bus during motor deceleration or overhauling loads, preventing over-voltage faults in the servo drive.
Detailed content
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Technical Specifications & Performance Parameters:
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Model Code Breakdown: PRD series, B040 likely indicates approx 400W continuous or specific ohm/watt rating class (Common PRD units range 100W-3000W+, 33ohm or 23ohm typical).
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Resistance Value: Typically 33 Ohms or 23 Ohms (Must match drive bus voltage and peak power calc).
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Power Rating: Matches application regen energy; “A3” may denote specific terminal type or enclosure variant.
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Duty Cycle: Intermittent (S1 continuous power lower than peak pulse capability).
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Working Principle: When DC bus voltage exceeds a preset threshold (e.g., 380V-400V in 240V drives), the drive switches the resistor across the bus to convert electrical energy into heat, clamping the bus voltage.
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Material & Structural Features:
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Element: Wirewound resistive alloy on ceramic core.
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Housing: Often aluminum extrusion with fins for convection, or enclosed metal box with terminals.
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Connections: Screw terminals for high-current cabling.
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Installation & Notes:
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Sizing Critical: Must be calculated via Motioneering software or manual calc (Energy = I²Rt). Undersized resistors will overheat.
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Location: Install in a well-ventilated area away from heat-sensitive components; do not enclose without forced cooling if running high duty.
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Cabling: Use appropriately sized cables (typically same gauge as drive power input or per manual) and route separately from low-voltage signal wires.
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