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Kollmorgen MMC-SD-8.0-460-D90
Product Name: MMC Smart Drive External Shunt / Regenerative Resistor Module
Product Introduction: This is an external dynamic braking resistor (shunt) module designed for Kollmorgen MMC-SD series drives or general 460 V class servo systems. It dissipates regenerative energy from decelerating motors that the drive cannot absorb internally.
Detailed content
Technical Specifications:
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Model Interpretation: 8.0 = 8.0 kW continuous power rating, 460 = 460 V AC system rating, D90 = likely a dimensional or terminal variant.
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Continuous Power: 1400 W (based on MMC-SD-8.0-460 standard specs)
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Peak Power: 17 kW
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Resistance: 50 Ω
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Max Voltage: 850 V DC (shunt trip threshold)
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Time Constant: 250 sec
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Dimensions: Approx. 130 x 182 x 710 mm
Material & Structure:
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Element: Wirewound resistive alloy on ceramic core or grid resistors in ventilated enclosure.
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Enclosure: Aluminum or steel housing with mounting brackets, often IP20 (requires separate enclosure if washdown).
Function: Connected across the DC bus (via drive’s external shunt terminals). When bus voltage exceeds a set threshold, the drive switches the resistor in to burn off excess energy.
Applications: Vertical axis loads, high inertia systems, frequent start-stop cycles in cranes, elevators, presses.
Installation Requirements: Mount in a well-ventilated area away from heat-sensitive components. Use appropriately sized cables (minimum 2.5 mm² typically) and ensure secure tightening of terminals. The resistor gets extremely hot during operation; guard against accidental contact.
Operating Considerations: Do not cover the resistor. Check insulation resistance periodically. Ensure drive shunt parameters are correctly set to avoid under/over braking.
