Preventive maintenance on the Allen-Bradley 1326AB-B430G-21 servomotor protects a permanent magnet synchronous motor designed for demanding motion control. We constantly emphasize the benefits of preventive maintenance, and today we stand firm, but we’ll also show you the consequences of not doing it.
Let’s start by learning a little about the Allen-Bradley servomotor we’re bringing you this time.
Description of the servomotor and its characteristics.
This servomotor offers 2.3 kW of power, a continuous torque of 6.4 Nm, and a rated speed of 5,000 RPM. It operates at 460/380 VAC three-phase and consumes between 4.5 and 5.6 A.
A resolver is used for feedback, making it ideal for electrically noisy environments. For mounting, the motor features a metric IEC flange with a keyway and a 108 mm frame diameter. Protection is ensured by an IP65-rated aluminum housing. With a peak-to-peak wobble of just 0.0005”, the motor delivers low vibration performance suitable for precision tasks. Compatibility includes Allen-Bradley 1391, Ultra3000, Kinetix 6000, and 1394 controllers.
Common uses.
This servo motor is used in applications that demand speed and repeatability. Perhaps the most unique application cases are the following:
- High-speed robotics benefits from its torque-to-inertia ratio.
- Cutting and assembly systems achieve fast and precise positioning.
- Synchronized conveyors and packaging machinery require fast cycle times and exact synchronization.
- Multi-axis centers use these motors with Kinetix or Ultra3000 controllers to coordinate complex movements.
Plants that value power density in tight spaces choose this motor. When the application demands dynamic response and closed-loop control with noise resistance, the resolver provides stability.
Correct preventive maintenance.
A structured preventive maintenance plan for an Allen-Bradley 1326AB-B430G-21 servomotor improves availability and reduces costs. If we want to design a proper maintenance plan, we could use the following checklist, where we define the most obvious tasks and frequencies:
- Monthly: visual inspection, external cleaning with dry air and antistatic cloths, seal check, and leak detection.
- Quarterly: connector and cable inspection; resolver signal check; terminal tightening.
- Semiannual: winding insulation measurement; vibration analysis; shaft axial and radial clearance control.
- Annual: partial disassembly; bearing and seal inspection; winding condition check; test bench testing.
Obviously, to perform these maintenance tasks, we need a suitable workshop. We provide you with the most important specialized tools you will need. Here’s the checklist of tools and measurements:
- Megger to measure the dielectric strength of the insulation, tachometer, vibration analyzer, clamp meter, and axial play gauge.
- Replace seals and bearings based on signs of wear; don’t wait for complete failure.
- Document readings and trends to anticipate failures.
Want to avoid costly downtime? Fill out our contact form and we’ll help you with your preventive maintenance plan.
Common failures if preventive maintenance is not applied.
Lack of preventive maintenance on the Allen-Bradley 1326AB-B430G-21 servomotor leads to mechanical and electrical problems. Bearings suffer wear due to contamination or lack of lubrication. Damaged seals allow grease and oil to enter the interior. Internal contamination causes insulation degradation and short circuits in the winding.
The resolver suffers when particles or moisture enter; erratic signals lead to positioning errors. The shaft exhibits misalignment and undercutting, producing vibrations and increased current. Loose connectors cause signal loss and intermittent failures. In all these cases, the plant suffers longer downtime and repair costs exceed the cost of preventive maintenance.
Case study: lack of preventive measures leading to a complex breakdown.
Throughout the article, you’ll find images of this repair, as well as a video that shows the condition of the equipment as we found it upon disassembly.
Situation: An Allen-Bradley 1326AB-B430G-21 servomotor operated without seal inspections. A worn seal allowed grease and oil to enter. The contamination reached the stator and the resolver.
Consequences detected during the inspection: clogged bearings; grease-impregnated windings and possible bypasses; compromised resolver; shaft with localized wear. Necessary corrective actions: bearing replacement, resolver replacement, seal replacement, shaft grinding, possible stator rewinding, washing and decontamination, sanding and painting, and final test on a test bench.
Cost and time: Corrective maintenance accumulated workshop hours, required parts that were difficult to locate due to obsolescence, and additional testing. The total cost far exceeded the value of an annual preventive plan.
The clear lesson: Preventive maintenance prevents escalation to complex and costly interventions.
Let’s not forget to prioritize preventative maintenance, especially on obsolete equipment.
Preventive maintenance on the Allen-Bradley 1326AB-B430G-21 servomotor protects performance, safety, and budget. On discontinued equipment, a lack of parts turns repairs into a logistical project. A plan for early inspection and replacement of seals and bearings reduces the risk of contaminant intrusion and resolver or winding failure.
At GDM, we help you with maintenance programs tailored to your servo system fleet, with parameter logs and trend-based alerts. Prevention reduces costs and prevents unplanned downtime. Request our diagnostic now, and we’ll provide solutions for your preventive maintenance plan.
Ready to save time and money? Fill out our contact form and we’ll help you with your preventive maintenance plan for servomotors.
