Kollmorgen MT308B1-E2C1 | Brushless Servo Motor 48VDC 8A Peak In Stock

Description

Product Introduction

When a legacy packaging line stops because the feed axis won’t index, the culprit is often a burnt winding in an old Kollmorgen MT308B1-E2C1 motor. This specific unit belongs to the classic M-Series, designed explicitly for low-inertia applications requiring rapid acceleration and deceleration cycles. We keep these in buffer stock because finding a direct physical fit for the mounting flange and shaft diameter without re-engineering the machine frame is nearly impossible today.The real value here lies in the thermal management design. Unlike newer generic equivalents, this motor handles continuous torque loads at 48VDC without derating until ambient temperatures hit 40°C. Honestly, the winding insulation class (Class F) allows it to run hotter than modern Class H units before failing, which matters in unventilated control cabinets. Don’t underestimate the lead time variability on these; once our current inventory of factory-sealed units is gone, you are looking at a custom rewind scenario or a full machine retrofit.

Key Technical Specifications

 Application Scenarios & Pain Points

The shift supervisor called at 2 AM because the label applicator on Line 4 was missing every third bottle. The root cause wasn’t the sensor; the Kollmorgen MT308B1-E2C1 driving the web tension roller had developed an intermittent short in Phase B. Because the motor was discontinued, the maintenance team couldn’t just swap it from the spare shelf. They had to idle the line for six hours while we overnighted a replacement from our regional hub. This module earns its price exactly when production uptime costs $5,000 per hour.

• Pharmaceutical Packaging: Can you afford a 4-hour downtime during a sterile fill campaign? This motor’s precise speed control ensures consistent fill volumes without product waste.
• Semiconductor Wafer Handling: The low inertia rotor allows for sub-second pick-and-place cycles, critical when throughput determines facility ROI.
• Food & Beverage Conveyors: Operating in washdown areas requires checking the IP rating; standard units need external guarding, but the sealed shaft option handles mild spray.
• Automotive Assembly: If your robot arm jerks during insertion, check the encoder feedback on these older units; wear on the disc can cause position drift.
• Textile Machinery: High cyclic rates generate heat; ensure your drive is tuned to limit current to the continuous rating to prevent insulation breakdown.

Case Study: A mid-sized automotive supplier in Ohio faced recurring faults on a rivet press. The original drives kept tripping on “Overcurrent.” After analyzing the load profile, we realized the replacement motor they bought previously had higher inertia, causing overshoot. Swapping in a verified MT308B1-E2C1 with the correct low-inertia characteristics eliminated the fault immediately. The plant engineer noted the cycle time dropped by 15% because the axis could stop faster without oscillating.

Quality Control Process (SOP Transparency)

We don’t just box these up and hope for the best. Every MT308B1-E2C1 leaving our warehouse goes through a strict verification protocol to protect your capital investment.

1. Inbound Inspection: We trace every serial number back to the original Danaher/Kollmorgen packing list or customs documentation. Our team performs a visual audit under LED magnification, looking specifically for shaft rust, terminal box corrosion, or signs of previous rewinding (discolored varnish). We verify the hologram sticker is intact.
2. Live Functional Test: We mount the motor on a test rig coupled to a Kollmorgen S200 drive. Power-up checks confirm the encoder outputs clean A/B/Z pulses on an oscilloscope. We run a no-load spin test for 30 minutes, logging bearing temperature rise with a Fluke infrared thermometer. If the temp rises more than 25°C above ambient, we reject it.
3. Electrical Parameters: Using a Megger MIT420, we test insulation resistance between windings and ground at 500V DC. We require >100 MΩ (far exceeding the 10 MΩ minimum). We also measure phase-to-phase resistance to ensure balance within 2%.
4. Firmware/Encoder Verification: While this is a motor, we verify the encoder resolution matches the datasheet (1000 lines) by counting pulses per revolution manually. We photograph the nameplate and internal wiring diagram for your records.
5. Final QC & Packaging: After passing all tests, we apply a “QC Passed” tag with the date and technician ID. The unit is bagged in anti-static material, wrapped in heavy-duty bubble wrap, and boxed with desiccant packs to prevent moisture damage during transit. We can share the specific test video for your unit upon request.

Installation Pitfalls Guide (“Lessons Learned”)

I’ve seen too many good motors killed by bad installation practices. Don’t let your team make these rookie mistakes.

1. Firmware/Drive Compatibility: Well, technically the motor is analog, but your drive parameters must match. If you swap this into a newer drive without updating the motor configuration file (MCF), the auto-tuning might apply excessive gain, causing violent oscillation. ❗ Always manually enter the Kt and Ke values from the nameplate.
2. DIP Switch / Jumper Misconfiguration: Some legacy drives use hardware jumpers to select commutation patterns. If these don’t match the Hall sensor sequence (if equipped) or encoder type, the motor will hum and overheat instantly. Take a photo of the old setup. Then take another one.
3. Terminal / Wiring Incompatibility: The wire gauge on older harnesses might be too small for the peak current if the new application demands higher dynamics. Check the voltage drop. Also, verify the pinout on the connector; Kollmogen changed some pin assignments between early and late M-Series revisions.
4. Power Supply Undersizing: This motor draws 8A peak. If your 48V supply is rated for only 5A continuous, it will sag during acceleration, causing the drive to fault on “Undervoltage.” Calculate the total rack load with at least 20% headroom.
5. ESD Damage: Skipping the wrist strap when handling the encoder connector is a gamble. A static discharge can fry the encoder pre-amp inside the motor housing. You won’t know until you power up and see zero feedback. Don’t risk a 2,000 replacement on a 5 strap.